* terrain: Use PhongMaterialSettings material for the non texture case
There is no functional change. With this change, the terrain uses a
material defined by QGIS instead of a default Qt3D. This will make it
easier to customize the shader in the future.
* qgsphongmaterialsettings: Fix setShininess signature
`mShininess` is a double.
* qgsphongtexturedmaterialsettings: Use a double to store shininess
This is already waht QgsPhongTexturedMaterialSettings does. The reason
for this change is to avoid the user-set values changing for them when
saving/restoring projects.
* qgsphongtexturedmaterialsettings: Use a double to store opacity
This is already waht QgsPhongTexturedMaterialSettings does. The reason
for this change is to avoid the user-set values changing for them when
saving/restoring projects.
* qgsphongtexturedmaterialsettings: Do proper opacity cast in toMaterial
* qgsphongtexturedmaterialsettings: Factor out material creation
This introduces a new class `QgsPhongTexturedMaterial` which is
similar to Qt3D `QDiffuseSpecularMaterial`.
`QgsPhongTexturedMaterial::toMaterial()` now calls
`QgsPhongTexturedMaterial` to create the material. This has no
functional change.
This will make it possible to directly use `QgsPhongTexturedMaterial`
for the terrain in the next commit. Indeed, the texture case needs to
use a `QTexture2D` which cannot be stored in a settings class. This
issue is avoided by directly creating the material instead of using
`QgsPhongTexturedMaterial::toMaterial()`.
* qgsterraintileloader: Fix typo
* terrain: Use QgsPhongTexturedMaterial for shading texture
There is no functional change. With this change, the terrain uses a
material defined by QGIS instead of a default Qt3D. This will make it
easier to customize the shader in the future.
* 3d/material: Introduce QgsTextureMaterial
This is the same material as the qt3d one:
`Qt3DExtras::QTextureMaterial`. It will also be used in the following
commit by the terrain.
* terrain: Use QgsTextureMaterial for non shading texture
There is no functional change. With this change, the terrain uses a
material defined by QGIS instead of a default Qt3D. This will make it
easier to customize the shader in the future.
