Add an icon in the 3d material combo box

images/images.qrc

@@ -880,6 +880,7 @@
         <file>themes/default/mIconAlignBottom.svg</file>
         <file>themes/default/mIconAlignTop.svg</file>
         <file>themes/default/mIconAlignVCenter.svg</file>
+        <file>themes/default/mIconPhongMaterial.svg</file>
     </qresource>
     <qresource prefix="/images/tips">
         <file alias="symbol_levels.png">qgis_tips/symbol_levels.png</file>

images/themes/default/mIconPhongMaterial.svg

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   viewBox="0 0 16 16"
+   version="1.1"
+   id="svg14"
+   sodipodi:docname="mIconPhongMaterial.svg"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)">
+  <metadata
+     id="metadata18">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <sodipodi:namedview
+     inkscape:document-rotation="0"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1043"
+     id="namedview16"
+     showgrid="false"
+     inkscape:zoom="18.981398"
+     inkscape:cx="-1.0328911"
+     inkscape:cy="10.253336"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg14" />
+  <defs
+     id="defs10">
+    <linearGradient
+       id="a">
+      <stop
+         offset="0"
+         stop-color="#ffebeb"
+         id="stop3" />
+      <stop
+         offset=".516"
+         stop-color="#be0f0f"
+         id="stop5" />
+      <stop
+         offset="1"
+         stop-color="#280000"
+         id="stop7" />
+    </linearGradient>
+    <radialGradient
+       inkscape:collect="always"
+       xlink:href="#a"
+       id="radialGradient869"
+       cx="6.1088824"
+       cy="6.2365189"
+       fx="6.1088824"
+       fy="6.2365189"
+       r="6"
+       gradientUnits="userSpaceOnUse"
+       gradientTransform="matrix(1.1139103,1.0868262,-1.085359,1.1124067,5.3465552,-7.847367)" />
+  </defs>
+  <circle
+     r="7"
+     style="fill:url(#radialGradient869);fill-opacity:1;stroke:none;stroke-width:2.11621;stroke-linecap:round;paint-order:stroke fill markers"
+     id="path843"
+     cx="8"
+     cy="8" />
+</svg>

python/3d/auto_generated/qgsmaterialregistry.sip.in

@@ -29,9 +29,11 @@ Stores metadata about one 3D material settings class.
 %End
   public:
 
-    QgsMaterialSettingsAbstractMetadata( const QString &type, const QString &visibleName );
+    QgsMaterialSettingsAbstractMetadata( const QString &type, const QString &visibleName, const QIcon &icon = QIcon() );
 %Docstring
 Constructor for QgsMaterialSettingsAbstractMetadata, with the specified ``type`` and ``visibleName``.
+
+An optional ``icon`` can be specified to represent the material type.
 %End
 
     virtual ~QgsMaterialSettingsAbstractMetadata();
@@ -44,6 +46,11 @@ Returns the unique material type string.
     QString visibleName() const;
 %Docstring
 Returns the material's visible (translated) name.
+%End
+
+    QIcon icon() const;
+%Docstring
+Returns an icon representing the material type, if available.
 %End
 
     virtual QgsAbstractMaterialSettings *create() = 0 /Factory/;

src/3d/qgs3d.cpp

@@ -66,7 +66,7 @@ void Qgs3D::initialize()
       &QgsPolygon3DSymbol::create, nullptr, Qgs3DSymbolImpl::handlerForPolygon3DSymbol ) );
 
   instance()->materialRegistry()->addMaterialSettingsType( new QgsMaterialSettingsMetadata( QStringLiteral( "phong" ), QObject::tr( "Realistic (Phong)" ),
-      QgsPhongMaterialSettings::create, nullptr ) );
+      QgsPhongMaterialSettings::create, nullptr, QgsApplication::getThemeIcon( QStringLiteral( "/mIconPhongMaterial.svg" ) ) ) );
 
   // because we are usually populating the 3d registry AFTER QgsApplication initialisation, we need to defer creation
   // of 3d symbols in the default style until now

src/3d/qgsmaterialregistry.h

@@ -21,6 +21,7 @@
 
 #include <QDomElement>
 #include <QMap>
+#include <QIcon>
 
 class QgsAbstractMaterialSettings;
 class QgsReadWriteContext;
@@ -41,10 +42,13 @@ class _3D_EXPORT QgsMaterialSettingsAbstractMetadata
 
     /**
      * Constructor for QgsMaterialSettingsAbstractMetadata, with the specified \a type and \a visibleName.
+     *
+     * An optional \a icon can be specified to represent the material type.
      */
-    QgsMaterialSettingsAbstractMetadata( const QString &type, const QString &visibleName )
+    QgsMaterialSettingsAbstractMetadata( const QString &type, const QString &visibleName, const QIcon &icon = QIcon() )
       : mType( type )
       , mVisibleName( visibleName )
+      , mIcon( icon )
     {}
 
     virtual ~QgsMaterialSettingsAbstractMetadata() = default;
@@ -59,6 +63,11 @@ class _3D_EXPORT QgsMaterialSettingsAbstractMetadata
      */
     QString visibleName() const { return mVisibleName; }
 
+    /**
+     * Returns an icon representing the material type, if available.
+     */
+    QIcon icon() const { return mIcon; }
+
     /**
      * Creates a new instance of this material settings type.
      *
@@ -81,6 +90,7 @@ class _3D_EXPORT QgsMaterialSettingsAbstractMetadata
   private:
     QString mType;
     QString mVisibleName;
+    QIcon mIcon;
 };
 
 //! Material settings creation function
@@ -108,11 +118,14 @@ class _3D_EXPORT QgsMaterialSettingsMetadata : public QgsMaterialSettingsAbstrac
      *
      * The \a pfCreate and \a pfWidget arguments are used to specify
      * static functions for creating the material settings type and configuration widget.
+     *
+     * An optional \a icon can be specified to represent the material type.
      */
     QgsMaterialSettingsMetadata( const QString &type, const QString &visibleName,
                                  QgsMaterialSettingsCreateFunc pfCreate,
-                                 QgsMaterialSettingsWidgetFunc pfWidget = nullptr )
-      : QgsMaterialSettingsAbstractMetadata( type, visibleName )
+                                 QgsMaterialSettingsWidgetFunc pfWidget = nullptr,
+                                 const QIcon &icon = QIcon() )
+      : QgsMaterialSettingsAbstractMetadata( type, visibleName, icon )
       , mCreateFunc( pfCreate )
       , mWidgetFunc( pfWidget )
     {}

src/app/3d/qgsmaterialwidget.cpp

@@ -30,7 +30,8 @@ QgsMaterialWidget::QgsMaterialWidget( QWidget *parent )
   const QStringList materialTypes = Qgs3D::materialRegistry()->materialSettingsTypes();
   for ( const QString &type : materialTypes )
   {
-    mMaterialTypeComboBox->addItem( Qgs3D::materialRegistry()->materialSettingsMetadata( type )->visibleName(), type );
+    mMaterialTypeComboBox->addItem( Qgs3D::materialRegistry()->materialSettingsMetadata( type )->icon(),
+                                    Qgs3D::materialRegistry()->materialSettingsMetadata( type )->visibleName(), type );
   }
 
   connect( mMaterialTypeComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsMaterialWidget::materialTypeChanged );