Add QgsMapLayerElevationProperties subclass for vector layers

Allows elevation properties to be set for vector layers, including:

- altitude binding
- altitude clamping
- extrusion
- scale
- offset

These properties can be set through the new "Elevation" tab in
the vector layer properties dialog

python/core/auto_generated/pointcloud/qgspointcloudlayerelevationproperties.sip.in

@@ -39,64 +39,6 @@ Constructor for QgsPointCloudLayerElevationProperties, with the specified ``pare
     virtual QgsDoubleRange calculateZRange( QgsMapLayer *layer ) const;
 
 
-    double zOffset() const;
-%Docstring
-Returns the z offset, which is a fixed offset amount which should be added to z values from
-the layer.
-
-This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsPointCloudLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsPointCloudLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`setZOffset`
-%End
-
-    void setZOffset( double offset );
-%Docstring
-Sets the z ``offset``, which is a fixed offset amount which will be added to z values from
-the layer.
-
-This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsPointCloudLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsPointCloudLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`zOffset`
-%End
-
-    double zScale() const;
-%Docstring
-Returns the z scale, which is a scaling factor which should be applied to z values from
-the layer.
-
-This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer, such
-as conversion of elevation values in feet to meters.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsPointCloudLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsPointCloudLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`setZScale`
-%End
-
-    void setZScale( double scale );
-%Docstring
-Sets the z ``scale``, which is a scaling factor which will be applied to z values from
-the layer.
-
-This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer, such
-as conversion of elevation values in feet to meters.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsPointCloudLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsPointCloudLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`zScale`
-%End
-
 };
 
 /************************************************************************

python/core/auto_generated/qgsmaplayerelevationproperties.sip.in

@@ -26,12 +26,17 @@ how an individual :py:class:`QgsMapLayer` behaves with relation to z values or e
 #include "qgsmaplayerelevationproperties.h"
 #include "qgspointcloudlayerelevationproperties.h"
 #include "qgsrasterlayerelevationproperties.h"
+#include "qgsvectorlayerelevationproperties.h"
 %End
 %ConvertToSubClassCode
     if ( qobject_cast<QgsPointCloudLayerElevationProperties *>( sipCpp ) )
     {
       sipType = sipType_QgsPointCloudLayerElevationProperties;
     }
+    else if ( qobject_cast<QgsVectorLayerElevationProperties *>( sipCpp ) )
+    {
+      sipType = sipType_QgsVectorLayerElevationProperties;
+    }
     else if ( qobject_cast<QgsRasterLayerElevationProperties *>( sipCpp ) )
     {
       sipType = sipType_QgsRasterLayerElevationProperties;
@@ -90,6 +95,60 @@ Attempts to calculate the overall elevation or z range for the specified ``layer
 the settings defined by this elevation properties object.
 
 May return an infinite range if the extent could not be calculated.
+%End
+
+    double zOffset() const;
+%Docstring
+Returns the z offset, which is a fixed offset amount which should be added to z values from
+the layer.
+
+.. note::
+
+   Any scaling specified via :py:func:`~QgsMapLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsMapLayerElevationProperties.zOffset`
+
+.. seealso:: :py:func:`setZOffset`
+%End
+
+    void setZOffset( double offset );
+%Docstring
+Sets the z ``offset``, which is a fixed offset amount which will be added to z values from
+the layer.
+
+.. note::
+
+   Any scaling specified via :py:func:`~QgsMapLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsMapLayerElevationProperties.zOffset`
+
+.. seealso:: :py:func:`zOffset`
+%End
+
+    double zScale() const;
+%Docstring
+Returns the z scale, which is a scaling factor which should be applied to z values from
+the layer.
+
+This can be used to correct or manually adjust for incorrect elevation values in a layer, such
+as conversion of elevation values in feet to meters.
+
+.. note::
+
+   Any scaling specified via :py:func:`~QgsMapLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsMapLayerElevationProperties.zOffset`
+
+.. seealso:: :py:func:`setZScale`
+%End
+
+    void setZScale( double scale );
+%Docstring
+Sets the z ``scale``, which is a scaling factor which will be applied to z values from
+the layer.
+
+This can be used to correct or manually adjust for incorrect elevation values in a layer, such
+as conversion of elevation values in feet to meters.
+
+.. note::
+
+   Any scaling specified via :py:func:`~QgsMapLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsMapLayerElevationProperties.zOffset`
+
+.. seealso:: :py:func:`zScale`
 %End
 
   signals:
@@ -98,6 +157,8 @@ May return an infinite range if the extent could not be calculated.
 %Docstring
 Emitted when the elevation properties have changed.
 %End
+
+  protected:
 };
 
 /************************************************************************

python/core/auto_generated/raster/qgsrasterlayerelevationproperties.sip.in

@@ -51,54 +51,6 @@ Returns ``True`` if the elevation properties are enabled, i.e. the raster layer
 Sets whether the elevation properties are enabled, i.e. the raster layer values represent an elevation surface.
 
 .. seealso:: :py:func:`isEnabled`
-%End
-
-    double zOffset() const;
-%Docstring
-Returns the z offset, which is a fixed offset amount which should be added to z values from
-the layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsRasterLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsRasterLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`setZOffset`
-%End
-
-    void setZOffset( double offset );
-%Docstring
-Sets the z ``offset``, which is a fixed offset amount which will be added to z values from
-the layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsRasterLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsRasterLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`zOffset`
-%End
-
-    double zScale() const;
-%Docstring
-Returns the z scale, which is a scaling factor which should be applied to z values from
-the layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsRasterLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsRasterLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`setZScale`
-%End
-
-    void setZScale( double scale );
-%Docstring
-Sets the z ``scale``, which is a scaling factor which will be applied to z values from
-the layer.
-
-.. note::
-
-   Any scaling specified via :py:func:`~QgsRasterLayerElevationProperties.zScale` is applied before any offset value specified via :py:func:`~QgsRasterLayerElevationProperties.zOffset`
-
-.. seealso:: :py:func:`zScale`
 %End
 
 };

python/core/auto_generated/vector/qgsvectorlayer.sip.in

@@ -509,12 +509,10 @@ Uses :py:class:`QgsExpression`
 
     virtual QgsVectorDataProvider *dataProvider() ${SIP_FINAL};
 
-
     virtual QgsMapLayerTemporalProperties *temporalProperties();
 
-%Docstring
-Returns temporal properties associated with the vector layer.
-%End
+    virtual QgsMapLayerElevationProperties *elevationProperties();
+
 
     void setProviderEncoding( const QString &encoding );
 %Docstring

python/core/auto_generated/vector/qgsvectorlayerelevationproperties.sip.in

@@ -0,0 +1,102 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/vector/qgsvectorlayerelevationproperties.h                  *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+
+
+class QgsVectorLayerElevationProperties : QgsMapLayerElevationProperties
+{
+%Docstring(signature="appended")
+Vector layer specific subclass of :py:class:`QgsMapLayerElevationProperties`.
+
+.. versionadded:: 3.26
+%End
+
+%TypeHeaderCode
+#include "qgsvectorlayerelevationproperties.h"
+%End
+  public:
+
+    QgsVectorLayerElevationProperties( QObject *parent /TransferThis/ );
+%Docstring
+Constructor for QgsVectorLayerElevationProperties, with the specified ``parent`` object.
+%End
+
+    virtual bool hasElevation() const;
+
+    virtual QDomElement writeXml( QDomElement &element, QDomDocument &doc, const QgsReadWriteContext &context );
+
+    virtual bool readXml( const QDomElement &element, const QgsReadWriteContext &context );
+
+    virtual bool isVisibleInZRange( const QgsDoubleRange &range ) const;
+
+    virtual QgsDoubleRange calculateZRange( QgsMapLayer *layer ) const;
+
+
+    Qgis::AltitudeClamping clamping() const;
+%Docstring
+Returns the altitude clamping method, which dictates how feature heights are interpreted
+with respect to terrain heights.
+
+.. seealso:: :py:func:`setClamping`
+%End
+
+    void setClamping( Qgis::AltitudeClamping clamping );
+%Docstring
+Sets the altitude ``clamping`` method, which dictates how feature heights are interpreted
+with respect to terrain heights.
+
+.. seealso:: :py:func:`clamping`
+%End
+
+    Qgis::AltitudeBinding binding() const;
+%Docstring
+Returns the altitude binding method, which determines how altitude is bound to individual vertices in features.
+
+.. seealso:: :py:func:`setBinding`
+%End
+
+    void setBinding( Qgis::AltitudeBinding binding );
+%Docstring
+Sets the altitude ``binding`` method, which determines how altitude is bound to individual vertices in features.
+
+.. seealso:: :py:func:`binding`
+%End
+
+    double extrusionHeight() const;
+%Docstring
+Returns the feature extrusion height.
+
+.. note::
+
+   the :py:func:`~QgsVectorLayerElevationProperties.zScale` factor is NOT applied to extrusion heights.
+
+.. seealso:: :py:func:`setExtrusionHeight`
+%End
+
+    void setExtrusionHeight( double height );
+%Docstring
+Sets the feature extrusion height.
+
+.. note::
+
+   the :py:func:`~QgsVectorLayerElevationProperties.zScale` factor is NOT applied to extrusion heights.
+
+.. seealso:: :py:func:`extrusionHeight`
+%End
+
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/vector/qgsvectorlayerelevationproperties.h                  *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/

python/core/core_auto.sip

@@ -674,6 +674,7 @@
 %Include auto_generated/vector/qgsvectorlayereditbuffer.sip
 %Include auto_generated/vector/qgsvectorlayereditpassthrough.sip
 %Include auto_generated/vector/qgsvectorlayereditutils.sip
+%Include auto_generated/vector/qgsvectorlayerelevationproperties.sip
 %Include auto_generated/vector/qgsvectorlayerexporter.sip
 %Include auto_generated/vector/qgsvectorlayerfeaturecounter.sip
 %Include auto_generated/vector/qgsvectorlayerfeatureiterator.sip

src/app/CMakeLists.txt

@@ -259,6 +259,8 @@ set(QGIS_APP_SRCS
   mesh/qgsmaptooleditmeshframe.cpp
   mesh/qgsmeshtransformcoordinatesdockwidget.cpp
   mesh/qgsmeshselectbyexpressiondialog.cpp
+
+  vector/qgsvectorelevationpropertieswidget.cpp
 )
 
 if (WITH_SPATIALITE)

src/app/qgisapp.cpp

@@ -118,6 +118,7 @@
 #include "options/qgscustomprojectionoptions.h"
 
 #include "raster/qgsrasterelevationpropertieswidget.h"
+#include "vector/qgsvectorelevationpropertieswidget.h"
 
 #ifdef HAVE_3D
 #include "qgs3d.h"
@@ -1481,6 +1482,7 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipBadLayers
 #endif
   registerMapLayerPropertiesFactory( new QgsPointCloudElevationPropertiesWidgetFactory( this ) );
   registerMapLayerPropertiesFactory( new QgsRasterElevationPropertiesWidgetFactory( this ) );
+  registerMapLayerPropertiesFactory( new QgsVectorElevationPropertiesWidgetFactory( this ) );
   registerMapLayerPropertiesFactory( new QgsAnnotationItemPropertiesWidgetFactory( this ) );
   registerMapLayerPropertiesFactory( new QgsLayerTreeGroupPropertiesWidgetFactory( this ) );
 

src/app/raster/qgsrasterelevationpropertieswidget.cpp

@@ -92,7 +92,7 @@ bool QgsRasterElevationPropertiesWidgetFactory::supportLayerPropertiesDialog() c
 
 bool QgsRasterElevationPropertiesWidgetFactory::supportsStyleDock() const
 {
-  return true;
+  return false;
 }
 
 bool QgsRasterElevationPropertiesWidgetFactory::supportsLayer( QgsMapLayer *layer ) const

src/app/vector/qgsvectorelevationpropertieswidget.cpp

@@ -0,0 +1,186 @@
+/***************************************************************************
+    qgsvectorrelevationpropertieswidget.cpp
+    ---------------------
+    begin                : February 2022
+    copyright            : (C) 2022 by Nyall Dawson
+    email                : nyall dot dawson at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsvectorelevationpropertieswidget.h"
+#include "qgsstyle.h"
+#include "qgsapplication.h"
+#include "qgsmaplayer.h"
+#include "qgsvectorlayer.h"
+#include "qgsvectorlayerelevationproperties.h"
+
+QgsVectorElevationPropertiesWidget::QgsVectorElevationPropertiesWidget( QgsVectorLayer *layer, QgsMapCanvas *canvas, QWidget *parent )
+  : QgsMapLayerConfigWidget( layer, canvas, parent )
+{
+  setupUi( this );
+
+  mOffsetZSpinBox->setClearValue( 0 );
+  mScaleZSpinBox->setClearValue( 1 );
+  mExtrusionSpinBox->setClearValue( 0 );
+
+  mComboClamping->addItem( tr( "Clamped to Terrain" ), static_cast< int >( Qgis::AltitudeClamping::Terrain ) );
+  mComboClamping->addItem( tr( "Relative to Terrain" ), static_cast< int >( Qgis::AltitudeClamping::Relative ) );
+  mComboClamping->addItem( tr( "Absolute" ), static_cast< int >( Qgis::AltitudeClamping::Absolute ) );
+
+  mComboBinding->addItem( tr( "Vertex" ), static_cast< int >( Qgis::AltitudeBinding::Vertex ) );
+  mComboBinding->addItem( tr( "Centroid" ), static_cast< int >( Qgis::AltitudeBinding::Centroid ) );
+
+  syncToLayer( layer );
+
+  connect( mOffsetZSpinBox, qOverload<double >( &QDoubleSpinBox::valueChanged ), this, &QgsVectorElevationPropertiesWidget::onChanged );
+  connect( mScaleZSpinBox, qOverload<double >( &QDoubleSpinBox::valueChanged ), this, &QgsVectorElevationPropertiesWidget::onChanged );
+  connect( mExtrusionSpinBox, qOverload<double >( &QDoubleSpinBox::valueChanged ), this, &QgsVectorElevationPropertiesWidget::onChanged );
+  connect( mComboClamping, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsVectorElevationPropertiesWidget::onChanged );
+  connect( mComboBinding, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsVectorElevationPropertiesWidget::onChanged );
+  connect( mComboClamping, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsVectorElevationPropertiesWidget::clampingChanged );
+  connect( mComboBinding, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsVectorElevationPropertiesWidget::bindingChanged );
+}
+
+void QgsVectorElevationPropertiesWidget::syncToLayer( QgsMapLayer *layer )
+{
+  mLayer = qobject_cast< QgsVectorLayer * >( layer );
+  if ( !mLayer )
+    return;
+
+  mBlockUpdates = true;
+  const QgsVectorLayerElevationProperties *props = qgis::down_cast< const QgsVectorLayerElevationProperties * >( mLayer->elevationProperties() );
+
+  mComboClamping->setCurrentIndex( mComboClamping->findData( static_cast< int >( props->clamping() ) ) );
+  mComboBinding->setCurrentIndex( mComboBinding->findData( static_cast< int >( props->binding() ) ) );
+  mOffsetZSpinBox->setValue( props->zOffset() );
+  mScaleZSpinBox->setValue( props->zScale() );
+  mExtrusionSpinBox->setValue( props->extrusionHeight() );
+  mBlockUpdates = false;
+
+  clampingChanged();
+  bindingChanged();
+}
+
+void QgsVectorElevationPropertiesWidget::apply()
+{
+  if ( !mLayer )
+    return;
+
+  QgsVectorLayerElevationProperties *props = qgis::down_cast< QgsVectorLayerElevationProperties * >( mLayer->elevationProperties() );
+
+  props->setZOffset( mOffsetZSpinBox->value() );
+  props->setZScale( mScaleZSpinBox->value() );
+  props->setClamping( static_cast< Qgis::AltitudeClamping >( mComboClamping->currentData().toInt() ) );
+  props->setBinding( static_cast< Qgis::AltitudeBinding >( mComboBinding->currentData().toInt() ) );
+  props->setExtrusionHeight( mExtrusionSpinBox->value() );
+  mLayer->trigger3DUpdate();
+}
+
+void QgsVectorElevationPropertiesWidget::onChanged()
+{
+  if ( !mBlockUpdates )
+    emit widgetChanged();
+}
+
+void QgsVectorElevationPropertiesWidget::clampingChanged()
+{
+  bool enableScale = true;
+  bool enableBinding = true;
+  switch ( static_cast< Qgis::AltitudeClamping >( mComboClamping->currentData().toInt() ) )
+  {
+    case Qgis::AltitudeClamping::Absolute:
+      mLabelClampingExplanation->setText(
+        QStringLiteral( "<p><b>%1</b></p><p>%2</p>" ).arg(
+          tr( "Elevation will be taken directly from features." ),
+          tr( "Z values from the features will be used for elevation, and the terrain height will be ignored." ) )
+      );
+      enableBinding = false; // not used in absolute mode
+      break;
+    case Qgis::AltitudeClamping::Relative:
+      mLabelClampingExplanation->setText(
+        QStringLiteral( "<p><b>%1</b></p><p>%2</p>" ).arg(
+          tr( "Elevation is relative to terrain height." ),
+          tr( "Any z values present in the features will be added to the terrain height." ) )
+      );
+      break;
+    case Qgis::AltitudeClamping::Terrain:
+      mLabelClampingExplanation->setText(
+        QStringLiteral( "<p><b>%1</b></p><p>%2</p>" ).arg(
+          tr( "Feature elevation will be taken directly from the terrain height." ),
+          tr( "Any existing z values present in the features will be ignored." ) )
+      );
+      enableScale = false; // not used in terrain mode
+      break;
+  }
+  mLabelScale->setVisible( enableScale );
+  mScaleZSpinBox->setVisible( enableScale );
+  mBindingGroupBox->setVisible( enableBinding );
+}
+
+void QgsVectorElevationPropertiesWidget::bindingChanged()
+{
+  switch ( static_cast< Qgis::AltitudeBinding >( mComboBinding->currentData().toInt() ) )
+  {
+    case Qgis::AltitudeBinding::Vertex:
+      mLabelBindingExplanation->setText(
+        QStringLiteral( "<p><b>%1</b></p><p>%2</p>" ).arg(
+          tr( "Feature elevation is relative to the terrain height at every vertex." ),
+          tr( "The terrain will be sampled at every individual vertex before being added to the vertex's z value." )
+        )
+      );
+      break;
+    case Qgis::AltitudeBinding::Centroid:
+      mLabelBindingExplanation->setText(
+        QStringLiteral( "<p><b>%1</b></p><p>%2</p>" ).arg(
+          tr( "Feature elevation is relative to the terrain height at feature's centroid only." ),
+          tr( "The terrain will be sampled once at the feature's centroid, with the centroid height being added to each vertex's z value." )
+        )
+      );
+      break;
+
+  }
+}
+
+
+//
+// QgsVectorElevationPropertiesWidgetFactory
+//
+
+QgsVectorElevationPropertiesWidgetFactory::QgsVectorElevationPropertiesWidgetFactory( QObject *parent )
+  : QObject( parent )
+{
+  setIcon( QgsApplication::getThemeIcon( QStringLiteral( "propertyicons/elevationscale.svg" ) ) );
+  setTitle( tr( "Elevation" ) );
+}
+
+QgsMapLayerConfigWidget *QgsVectorElevationPropertiesWidgetFactory::createWidget( QgsMapLayer *layer, QgsMapCanvas *canvas, bool, QWidget *parent ) const
+{
+  return new QgsVectorElevationPropertiesWidget( qobject_cast< QgsVectorLayer * >( layer ), canvas, parent );
+}
+
+bool QgsVectorElevationPropertiesWidgetFactory::supportLayerPropertiesDialog() const
+{
+  return true;
+}
+
+bool QgsVectorElevationPropertiesWidgetFactory::supportsStyleDock() const
+{
+  return false;
+}
+
+bool QgsVectorElevationPropertiesWidgetFactory::supportsLayer( QgsMapLayer *layer ) const
+{
+  return layer->type() == QgsMapLayerType::VectorLayer;
+}
+
+QString QgsVectorElevationPropertiesWidgetFactory::layerPropertiesPagePositionHint() const
+{
+  return QStringLiteral( "mOptsPage_Metadata" );
+}
+

src/app/vector/qgsvectorelevationpropertieswidget.h

@@ -0,0 +1,67 @@
+/***************************************************************************
+    qgsvectorrelevationpropertieswidget.h
+    ---------------------
+    begin                : February 2022
+    copyright            : (C) 2022 by Nyall Dawson
+    email                : nyall dot dawson at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSVECTORELEVATIONPROPERTIESWIDGET_H
+#define QGSVECTORELEVATIONPROPERTIESWIDGET_H
+
+#include "qgsmaplayerconfigwidget.h"
+#include "qgsmaplayerconfigwidgetfactory.h"
+
+#include "ui_qgsvectorelevationpropertieswidgetbase.h"
+
+class QgsVectorLayer;
+
+class QgsVectorElevationPropertiesWidget : public QgsMapLayerConfigWidget, private Ui::QgsVectorElevationPropertiesWidgetBase
+{
+    Q_OBJECT
+  public:
+
+    QgsVectorElevationPropertiesWidget( QgsVectorLayer *layer, QgsMapCanvas *canvas, QWidget *parent );
+
+    void syncToLayer( QgsMapLayer *layer ) override;
+
+  public slots:
+    void apply() override;
+
+  private slots:
+
+    void onChanged();
+    void clampingChanged();
+    void bindingChanged();
+
+  private:
+
+    QgsVectorLayer *mLayer = nullptr;
+    bool mBlockUpdates = false;
+
+};
+
+
+class QgsVectorElevationPropertiesWidgetFactory : public QObject, public QgsMapLayerConfigWidgetFactory
+{
+    Q_OBJECT
+  public:
+    explicit QgsVectorElevationPropertiesWidgetFactory( QObject *parent = nullptr );
+
+    QgsMapLayerConfigWidget *createWidget( QgsMapLayer *layer, QgsMapCanvas *canvas, bool dockWidget, QWidget *parent ) const override;
+    bool supportLayerPropertiesDialog() const override;
+    bool supportsStyleDock() const override;
+    bool supportsLayer( QgsMapLayer *layer ) const override;
+    QString layerPropertiesPagePositionHint() const override;
+};
+
+
+
+#endif // QGSVECTORELEVATIONPROPERTIESWIDGET_H

src/core/CMakeLists.txt

@@ -819,6 +819,7 @@ set(QGIS_CORE_SRCS
   vector/qgsvectorlayereditbuffer.cpp
   vector/qgsvectorlayereditpassthrough.cpp
   vector/qgsvectorlayereditutils.cpp
+  vector/qgsvectorlayerelevationproperties.cpp
   vector/qgsvectorlayerfeatureiterator.cpp
   vector/qgsvectorlayerexporter.cpp
   vector/qgsvectorlayerjoinbuffer.cpp
@@ -1758,6 +1759,7 @@ set(QGIS_CORE_HDRS
   vector/qgsvectorlayereditbuffer.h
   vector/qgsvectorlayereditpassthrough.h
   vector/qgsvectorlayereditutils.h
+  vector/qgsvectorlayerelevationproperties.h
   vector/qgsvectorlayerexporter.h
   vector/qgsvectorlayerfeaturecounter.h
   vector/qgsvectorlayerfeatureiterator.h

src/core/pointcloud/qgspointcloudlayerelevationproperties.h

@@ -48,60 +48,6 @@ class CORE_EXPORT QgsPointCloudLayerElevationProperties : public QgsMapLayerElev
     bool isVisibleInZRange( const QgsDoubleRange &range ) const override;
     QgsDoubleRange calculateZRange( QgsMapLayer *layer ) const override;
 
-    /**
-     * Returns the z offset, which is a fixed offset amount which should be added to z values from
-     * the layer.
-     *
-     * This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see setZOffset()
-     */
-    double zOffset() const { return mZOffset; }
-
-    /**
-     * Sets the z \a offset, which is a fixed offset amount which will be added to z values from
-     * the layer.
-     *
-     * This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see zOffset()
-     */
-    void setZOffset( double offset ) { mZOffset = offset; }
-
-    /**
-     * Returns the z scale, which is a scaling factor which should be applied to z values from
-     * the layer.
-     *
-     * This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer, such
-     * as conversion of elevation values in feet to meters.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see setZScale()
-     */
-    double zScale() const { return mZScale; }
-
-    /**
-     * Sets the z \a scale, which is a scaling factor which will be applied to z values from
-     * the layer.
-     *
-     * This can be used to correct or manually adjust for incorrect elevation values in a point cloud layer, such
-     * as conversion of elevation values in feet to meters.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see zScale()
-     */
-    void setZScale( double scale ) { mZScale = scale; }
-
-  private:
-
-    double mZScale = 1.0;
-    double mZOffset = 0.0;
 };
 
 #endif // QGSPOINTCLOUDLAYERELEVATIONPROPERTIES_H

src/core/qgsmaplayerelevationproperties.h

@@ -42,6 +42,7 @@ class CORE_EXPORT QgsMapLayerElevationProperties : public QObject
 #ifdef SIP_RUN
 #include "qgspointcloudlayerelevationproperties.h"
 #include "qgsrasterlayerelevationproperties.h"
+#include "qgsvectorlayerelevationproperties.h"
 #endif
 
     Q_OBJECT
@@ -52,6 +53,10 @@ class CORE_EXPORT QgsMapLayerElevationProperties : public QObject
     {
       sipType = sipType_QgsPointCloudLayerElevationProperties;
     }
+    else if ( qobject_cast<QgsVectorLayerElevationProperties *>( sipCpp ) )
+    {
+      sipType = sipType_QgsVectorLayerElevationProperties;
+    }
     else if ( qobject_cast<QgsRasterLayerElevationProperties *>( sipCpp ) )
     {
       sipType = sipType_QgsRasterLayerElevationProperties;
@@ -116,12 +121,64 @@ class CORE_EXPORT QgsMapLayerElevationProperties : public QObject
      */
     virtual QgsDoubleRange calculateZRange( QgsMapLayer *layer ) const;
 
+    /**
+     * Returns the z offset, which is a fixed offset amount which should be added to z values from
+     * the layer.
+     *
+     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
+     *
+     * \see setZOffset()
+     */
+    double zOffset() const { return mZOffset; }
+
+    /**
+     * Sets the z \a offset, which is a fixed offset amount which will be added to z values from
+     * the layer.
+     *
+     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
+     *
+     * \see zOffset()
+     */
+    void setZOffset( double offset ) { mZOffset = offset; }
+
+    /**
+     * Returns the z scale, which is a scaling factor which should be applied to z values from
+     * the layer.
+     *
+     * This can be used to correct or manually adjust for incorrect elevation values in a layer, such
+     * as conversion of elevation values in feet to meters.
+     *
+     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
+     *
+     * \see setZScale()
+     */
+    double zScale() const { return mZScale; }
+
+    /**
+     * Sets the z \a scale, which is a scaling factor which will be applied to z values from
+     * the layer.
+     *
+     * This can be used to correct or manually adjust for incorrect elevation values in a layer, such
+     * as conversion of elevation values in feet to meters.
+     *
+     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
+     *
+     * \see zScale()
+     */
+    void setZScale( double scale ) { mZScale = scale; }
+
   signals:
 
     /**
      * Emitted when the elevation properties have changed.
      */
     void changed();
+
+  protected:
+    //! Z scale
+    double mZScale = 1.0;
+    //! Z offset
+    double mZOffset = 0.0;
 };
 
 #endif // QGSMAPLAYERELEVATIONPROPERTIES_H

src/core/raster/qgsrasterlayerelevationproperties.h

@@ -62,51 +62,10 @@ class CORE_EXPORT QgsRasterLayerElevationProperties : public QgsMapLayerElevatio
      */
     void setEnabled( bool enabled ) { mEnabled = enabled; }
 
-    /**
-     * Returns the z offset, which is a fixed offset amount which should be added to z values from
-     * the layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see setZOffset()
-     */
-    double zOffset() const { return mZOffset; }
-
-    /**
-     * Sets the z \a offset, which is a fixed offset amount which will be added to z values from
-     * the layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see zOffset()
-     */
-    void setZOffset( double offset ) { mZOffset = offset; }
-
-    /**
-     * Returns the z scale, which is a scaling factor which should be applied to z values from
-     * the layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see setZScale()
-     */
-    double zScale() const { return mZScale; }
-
-    /**
-     * Sets the z \a scale, which is a scaling factor which will be applied to z values from
-     * the layer.
-     *
-     * \note Any scaling specified via zScale() is applied before any offset value specified via zOffset()
-     *
-     * \see zScale()
-     */
-    void setZScale( double scale ) { mZScale = scale; }
-
   private:
 
     bool mEnabled = false;
-    double mZScale = 1.0;
-    double mZOffset = 0.0;
+
 };
 
 #endif // QGSRASTERLAYERELEVATIONPROPERTIES_H

src/core/vector/qgsvectorlayer.cpp

@@ -57,6 +57,7 @@
 #include "qgsrendercontext.h"
 #include "qgsvectordataprovider.h"
 #include "qgsvectorlayertemporalproperties.h"
+#include "qgsvectorlayerelevationproperties.h"
 #include "qgsvectorlayereditbuffer.h"
 #include "qgsvectorlayereditpassthrough.h"
 #include "qgsvectorlayereditutils.h"
@@ -157,6 +158,7 @@ QgsVectorLayer::QgsVectorLayer( const QString &vectorLayerPath,
                                 const QgsVectorLayer::LayerOptions &options )
   : QgsMapLayer( QgsMapLayerType::VectorLayer, baseName, vectorLayerPath )
   , mTemporalProperties( new QgsVectorLayerTemporalProperties( this ) )
+  , mElevationProperties( new QgsVectorLayerElevationProperties( this ) )
   , mAuxiliaryLayer( nullptr )
   , mAuxiliaryLayerKey( QString() )
   , mReadExtentFromXml( options.readExtentFromXml )
@@ -670,6 +672,11 @@ QgsMapLayerTemporalProperties *QgsVectorLayer::temporalProperties()
   return mTemporalProperties;
 }
 
+QgsMapLayerElevationProperties *QgsVectorLayer::elevationProperties()
+{
+  return mElevationProperties;
+}
+
 void QgsVectorLayer::setProviderEncoding( const QString &encoding )
 {
   if ( isValid() && mDataProvider && mDataProvider->encoding() != encoding )

src/core/vector/qgsvectorlayer.h

@@ -80,6 +80,7 @@ class QgsGeometryOptions;
 class QgsStyleEntityVisitorInterface;
 class QgsVectorLayerTemporalProperties;
 class QgsFeatureRendererGenerator;
+class QgsVectorLayerElevationProperties;
 
 typedef QList<int> QgsAttributeList;
 typedef QSet<int> QgsAttributeIds;
@@ -624,11 +625,8 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
 
     QgsVectorDataProvider *dataProvider() FINAL;
     const QgsVectorDataProvider *dataProvider() const FINAL SIP_SKIP;
-
-    /**
-     * Returns temporal properties associated with the vector layer.
-     */
     QgsMapLayerTemporalProperties *temporalProperties() override;
+    QgsMapLayerElevationProperties *elevationProperties() override;
 
     /**
      * Sets the text \a encoding of the data provider.
@@ -2867,6 +2865,8 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
     //! Pointer to temporal properties
     QgsVectorLayerTemporalProperties *mTemporalProperties = nullptr;
 
+    QgsVectorLayerElevationProperties *mElevationProperties = nullptr;
+
     //! The preview expression used to generate a human readable preview string for features
     QString mDisplayExpression;
 

src/core/vector/qgsvectorlayerelevationproperties.cpp

@@ -0,0 +1,68 @@
+/***************************************************************************
+                         qgsvectorlayerelevationproperties.cpp
+                         ---------------
+    begin                : February 2022
+    copyright            : (C) 2022 by Nyall Dawson
+    email                : nyall dot dawson dot com
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsvectorlayerelevationproperties.h"
+#include "qgsrasterlayer.h"
+
+QgsVectorLayerElevationProperties::QgsVectorLayerElevationProperties( QObject *parent )
+  : QgsMapLayerElevationProperties( parent )
+{
+}
+
+bool QgsVectorLayerElevationProperties::hasElevation() const
+{
+  // layer is considered as having non-default elevation settings if we aren't clamping to terrain
+  return mClamping != Qgis::AltitudeClamping::Terrain;
+}
+
+QDomElement QgsVectorLayerElevationProperties::writeXml( QDomElement &parentElement, QDomDocument &document, const QgsReadWriteContext & )
+{
+  QDomElement element = document.createElement( QStringLiteral( "elevation" ) );
+  element.setAttribute( QStringLiteral( "zoffset" ), qgsDoubleToString( mZOffset ) );
+  element.setAttribute( QStringLiteral( "zscale" ), qgsDoubleToString( mZScale ) );
+
+  element.setAttribute( QStringLiteral( "extrusion" ), qgsDoubleToString( mExtrusionHeight ) );
+  element.setAttribute( QStringLiteral( "clamping" ), qgsEnumValueToKey( mClamping ) );
+  element.setAttribute( QStringLiteral( "binding" ), qgsEnumValueToKey( mBinding ) );
+  parentElement.appendChild( element );
+  return element;
+}
+
+bool QgsVectorLayerElevationProperties::readXml( const QDomElement &element, const QgsReadWriteContext & )
+{
+  const QDomElement elevationElement = element.firstChildElement( QStringLiteral( "elevation" ) ).toElement();
+  mZOffset = elevationElement.attribute( QStringLiteral( "zoffset" ), QStringLiteral( "0" ) ).toDouble();
+  mZScale = elevationElement.attribute( QStringLiteral( "zscale" ), QStringLiteral( "1" ) ).toDouble();
+
+  mClamping = qgsEnumKeyToValue( elevationElement.attribute( QStringLiteral( "clamping" ) ), Qgis::AltitudeClamping::Terrain );
+  mBinding = qgsEnumKeyToValue( elevationElement.attribute( QStringLiteral( "binding" ) ), Qgis::AltitudeBinding::Centroid );
+  mExtrusionHeight = elevationElement.attribute( QStringLiteral( "extrusion" ), QStringLiteral( "0" ) ).toDouble();
+
+  return true;
+}
+
+bool QgsVectorLayerElevationProperties::isVisibleInZRange( const QgsDoubleRange & ) const
+{
+  // TODO -- test actual layer z range
+  return true;
+}
+
+QgsDoubleRange QgsVectorLayerElevationProperties::calculateZRange( QgsMapLayer * ) const
+{
+  // TODO -- determine actual z range from layer statistics
+  return QgsDoubleRange();
+}

src/core/vector/qgsvectorlayerelevationproperties.h

@@ -0,0 +1,109 @@
+/***************************************************************************
+                         qgsvectorlayerelevationproperties.h
+                         ---------------
+    begin                : February 2022
+    copyright            : (C) 2022 by Nyall Dawson
+    email                : nyall dot dawson dot com
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+
+#ifndef QGSVECTORLAYERELEVATIONPROPERTIES_H
+#define QGSVECTORLAYERELEVATIONPROPERTIES_H
+
+#include "qgis_core.h"
+#include "qgis_sip.h"
+#include "qgis.h"
+#include "qgsmaplayerelevationproperties.h"
+
+/**
+ * \class QgsVectorLayerElevationProperties
+ * \ingroup core
+ * \brief Vector layer specific subclass of QgsMapLayerElevationProperties.
+ *
+ * \since QGIS 3.26
+ */
+class CORE_EXPORT QgsVectorLayerElevationProperties : public QgsMapLayerElevationProperties
+{
+
+    Q_OBJECT
+
+  public:
+
+    /**
+     * Constructor for QgsVectorLayerElevationProperties, with the specified \a parent object.
+     */
+    QgsVectorLayerElevationProperties( QObject *parent SIP_TRANSFERTHIS );
+
+    bool hasElevation() const override;
+    QDomElement writeXml( QDomElement &element, QDomDocument &doc, const QgsReadWriteContext &context ) override;
+    bool readXml( const QDomElement &element, const QgsReadWriteContext &context ) override;
+    bool isVisibleInZRange( const QgsDoubleRange &range ) const override;
+    QgsDoubleRange calculateZRange( QgsMapLayer *layer ) const override;
+
+    /**
+     * Returns the altitude clamping method, which dictates how feature heights are interpreted
+     * with respect to terrain heights.
+     *
+     * \see setClamping()
+     */
+    Qgis::AltitudeClamping clamping() const { return mClamping; }
+
+    /**
+     * Sets the altitude \a clamping method, which dictates how feature heights are interpreted
+     * with respect to terrain heights.
+     *
+     * \see clamping()
+     */
+    void setClamping( Qgis::AltitudeClamping clamping ) { mClamping = clamping; }
+
+    /**
+     * Returns the altitude binding method, which determines how altitude is bound to individual vertices in features.
+     *
+     * \see setBinding()
+     */
+    Qgis::AltitudeBinding binding() const { return mBinding; }
+
+    /**
+     * Sets the altitude \a binding method, which determines how altitude is bound to individual vertices in features.
+     *
+     * \see binding()
+     */
+    void setBinding( Qgis::AltitudeBinding binding ) { mBinding = binding; }
+
+    /**
+     * Returns the feature extrusion height.
+     *
+     * \note the zScale() factor is NOT applied to extrusion heights.
+     *
+     * \see setExtrusionHeight()
+     */
+    double extrusionHeight() const { return mExtrusionHeight; }
+
+    /**
+     * Sets the feature extrusion height.
+     *
+     * \note the zScale() factor is NOT applied to extrusion heights.
+     *
+     * \see extrusionHeight()
+     */
+    void setExtrusionHeight( double height ) { mExtrusionHeight = height; }
+
+  private:
+
+    Qgis::AltitudeClamping mClamping = Qgis::AltitudeClamping::Terrain;
+    Qgis::AltitudeBinding mBinding = Qgis::AltitudeBinding::Centroid;
+
+    double mExtrusionHeight = 0;
+
+};
+
+#endif // QGSVECTORLAYERELEVATIONPROPERTIES_H

src/ui/qgsvectorelevationpropertieswidgetbase.ui

@@ -0,0 +1,228 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>QgsVectorElevationPropertiesWidgetBase</class>
+ <widget class="QWidget" name="QgsVectorElevationPropertiesWidgetBase">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>555</width>
+    <height>445</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Vector Elevation Properties</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QGroupBox" name="mElevationGroupBox">
+     <property name="focusPolicy">
+      <enum>Qt::StrongFocus</enum>
+     </property>
+     <property name="title">
+      <string>Elevation Clamping</string>
+     </property>
+     <property name="checkable">
+      <bool>false</bool>
+     </property>
+     <property name="syncGroup" stdset="0">
+      <string notr="true">vectorgeneral</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2" columnstretch="0,1,0">
+      <item row="3" column="1" colspan="2">
+       <widget class="QgsDoubleSpinBox" name="mOffsetZSpinBox">
+        <property name="decimals">
+         <number>6</number>
+        </property>
+        <property name="minimum">
+         <double>-99999999999.000000000000000</double>
+        </property>
+        <property name="maximum">
+         <double>99999999999.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0" colspan="3">
+       <widget class="QLabel" name="mLabelClampingExplanation">
+        <property name="text">
+         <string/>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="0" colspan="3">
+       <widget class="QComboBox" name="mComboClamping"/>
+      </item>
+      <item row="3" column="0">
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>Offset</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="0">
+       <widget class="QLabel" name="mLabelScale">
+        <property name="text">
+         <string>Scale</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1" colspan="2">
+       <widget class="QgsDoubleSpinBox" name="mScaleZSpinBox">
+        <property name="decimals">
+         <number>6</number>
+        </property>
+        <property name="minimum">
+         <double>0.000000000000000</double>
+        </property>
+        <property name="maximum">
+         <double>99999999999.000000000000000</double>
+        </property>
+        <property name="value">
+         <double>1.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="mExtrusionGroupBox">
+     <property name="focusPolicy">
+      <enum>Qt::StrongFocus</enum>
+     </property>
+     <property name="title">
+      <string>Extrusion</string>
+     </property>
+     <property name="checkable">
+      <bool>false</bool>
+     </property>
+     <property name="syncGroup" stdset="0">
+      <string notr="true">vectorgeneral</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_4">
+      <item row="3" column="0">
+       <widget class="Line" name="line_5">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="0" colspan="2">
+       <widget class="QLabel" name="mLabelBindingExplanation_2">
+        <property name="text">
+         <string>Extrusion controls how high features extend vertically above their base.</string>
+        </property>
+        <property name="textFormat">
+         <enum>Qt::PlainText</enum>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Height</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QgsDoubleSpinBox" name="mExtrusionSpinBox">
+        <property name="decimals">
+         <number>6</number>
+        </property>
+        <property name="minimum">
+         <double>-99999999999.000000000000000</double>
+        </property>
+        <property name="maximum">
+         <double>99999999999.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="mBindingGroupBox">
+     <property name="focusPolicy">
+      <enum>Qt::StrongFocus</enum>
+     </property>
+     <property name="title">
+      <string>Elevation Binding</string>
+     </property>
+     <property name="checkable">
+      <bool>false</bool>
+     </property>
+     <property name="syncGroup" stdset="0">
+      <string notr="true">vectorgeneral</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_3">
+      <item row="0" column="0" colspan="2">
+       <widget class="QComboBox" name="mComboBinding"/>
+      </item>
+      <item row="2" column="0">
+       <widget class="Line" name="line_4">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0" colspan="2">
+       <widget class="QLabel" name="mLabelBindingExplanation">
+        <property name="text">
+         <string/>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QgsDoubleSpinBox</class>
+   <extends>QDoubleSpinBox</extends>
+   <header>qgsdoublespinbox.h</header>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>mElevationGroupBox</tabstop>
+  <tabstop>mScaleZSpinBox</tabstop>
+  <tabstop>mOffsetZSpinBox</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

tests/src/python/CMakeLists.txt

@@ -349,6 +349,7 @@ ADD_PYTHON_TEST(PyQgsVectorFieldMarkerSymbolLayer test_qgsvectorfieldmarkersymbo
 ADD_PYTHON_TEST(PyQgsVectorFileWriter test_qgsvectorfilewriter.py)
 ADD_PYTHON_TEST(PyQgsVectorFileWriterTask test_qgsvectorfilewritertask.py)
 ADD_PYTHON_TEST(PyQgsVectorLayer test_qgsvectorlayer.py)
+ADD_PYTHON_TEST(PyQgsVectorLayerElevationProperties test_qgsvectorlayerelevationproperties.py)
 ADD_PYTHON_TEST(PyQgsVectorLayerFeatureCounter test_qgsvectorlayerfeaturecounter.py)
 ADD_PYTHON_TEST(PyQgsVectorLayerCache test_qgsvectorlayercache.py)
 ADD_PYTHON_TEST(PyQgsVectorLayerEditBuffer test_qgsvectorlayereditbuffer.py)

tests/src/python/test_qgsrasterlayerelevationproperties.py

@@ -49,7 +49,7 @@ class TestQgsRasterLayerElevationProperties(unittest.TestCase):
         props2.readXml(elem, QgsReadWriteContext())
         self.assertEqual(props2.zScale(), 2)
         self.assertEqual(props2.zOffset(), 0.5)
-        self.assertTrue(props.isEnabled())
+        self.assertTrue(props2.isEnabled())
 
 
 if __name__ == '__main__':

tests/src/python/test_qgsvectorlayerelevationproperties.py

@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+"""QGIS Unit tests for QgsVectorLayerElevationProperties
+
+.. note:: This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+"""
+__author__ = 'Nyall Dawson'
+__date__ = '09/11/2020'
+__copyright__ = 'Copyright 2020, The QGIS Project'
+
+import qgis  # NOQA
+
+from qgis.core import (
+    Qgis,
+    QgsVectorLayerElevationProperties,
+    QgsReadWriteContext,
+)
+
+from qgis.PyQt.QtXml import QDomDocument
+
+from qgis.testing import start_app, unittest
+
+start_app()
+
+
+class TestQgsVectorLayerElevationProperties(unittest.TestCase):
+
+    def testBasic(self):
+        props = QgsVectorLayerElevationProperties(None)
+        self.assertEqual(props.zScale(), 1)
+        self.assertEqual(props.zOffset(), 0)
+        self.assertEqual(props.extrusionHeight(), 0)
+        self.assertFalse(props.hasElevation())
+        self.assertEqual(props.clamping(), Qgis.AltitudeClamping.Terrain)
+        self.assertEqual(props.binding(), Qgis.AltitudeBinding.Centroid)
+
+        props.setZOffset(0.5)
+        props.setZScale(2)
+        props.setClamping(Qgis.AltitudeClamping.Relative)
+        props.setBinding(Qgis.AltitudeBinding.Vertex)
+        props.setExtrusionHeight(10)
+        self.assertEqual(props.zScale(), 2)
+        self.assertEqual(props.zOffset(), 0.5)
+        self.assertEqual(props.extrusionHeight(), 10)
+        self.assertTrue(props.hasElevation())
+        self.assertEqual(props.clamping(), Qgis.AltitudeClamping.Relative)
+        self.assertEqual(props.binding(), Qgis.AltitudeBinding.Vertex)
+
+        doc = QDomDocument("testdoc")
+        elem = doc.createElement('test')
+        props.writeXml(elem, doc, QgsReadWriteContext())
+
+        props2 = QgsVectorLayerElevationProperties(None)
+        props2.readXml(elem, QgsReadWriteContext())
+        self.assertEqual(props2.zScale(), 2)
+        self.assertEqual(props2.zOffset(), 0.5)
+        self.assertEqual(props2.clamping(), Qgis.AltitudeClamping.Relative)
+        self.assertEqual(props2.binding(), Qgis.AltitudeBinding.Vertex)
+        self.assertEqual(props2.extrusionHeight(), 10)
+
+
+if __name__ == '__main__':
+    unittest.main()