Adds a new material choice for a physically based metal/roughness
material. Options are available for setting the material base color,
metalness and roughness.
Internally this uses a clone of Qt's QMetalRoughMaterial class. We
use a copy of the Qt class instead of relying on Qt's implementation
as longer-term improvements (such as data defined base color) will
require a re-implementation anyway. By using our own material we
will avoid having two different code paths for the data-defined/
non-data defined scenarios.
Qgs3DMapScene.openScenes() will now return a map of
open Qgs3DMapScene objects (by name) visible in the app. Various
basic properties of the scene are exposed, including
the camera controller, allowing access to navigate 3d
scenes via python
This is a "null" shading material which should be used when
rendering models or scenes with native textures and no material
should be explicitly set on the loaded entities.
Otherwise this provider cannot be initialized from standalone Python
scripts
Fixes#36661
Also cleanup 3d sip generation by correctly defining SIP_NO_FILE
in headers we don't want to expose, so that the sip_include script
can do its magic
