Reworks multiple shaders and materials for URP compatibility and adds a Loading screen/scene and a few model imports. Key changes:
- Converted ProBuilder standard vertex-color shader and several particle/surface shaders to URP HLSL passes (UniversalForward, ShadowCaster, Depth, DepthNormals) preserving base texture * tint * vertex color, normal map and PBR parameters.
- Updated particle SurfaceShader_VC to a URP forward pass and simplified lighting to use URP shader library helpers.
- Updated materials (landMark, tile) to point to project textures, adjust keywords/flags (e.g. XRMotionVectorsPass, disable ShadowCaster for one), tweak tiling and base color values.
- Added a Loading screen UI (UXML, USS) and LoadingScreenController.cs plus a new Loading scene and scene metadata.
- Imported new FBX assets (T-Pose, Untitled) and updated Editor build settings / project settings to include the new Loading scene.
These changes migrate rendering code to the Universal Render Pipeline and add a basic loading UI/scene, while updating materials and project settings accordingly.
Bulk-updates Mixamo material assets under Assets/Mixamo Animations to the Universal Render Pipeline material layout (serializedVersion -> 8). Shader references were replaced with the URP shader GUID, an AssetVersion MonoBehaviour block was added, and many new material properties were added/normalized (BaseMap/_BaseColor/_SpecColor, SpecGlossMap, unity_Lightmaps/unity_ShadowMasks, various floats/ints like _Smoothness/_Cull/_Surface/_WorkflowMode, disabled MOTIONVECTORS pass, etc.). ProjectSettings.asset was also modified (likely to reflect the pipeline update). These changes align materials with URP serialization and rendering expectations.
