add extra info for converted i3dm gltf

[tomlee-dev]

for distingushing other type of converted gltf (e.g. b3dm, vctr, pnts, cmpt)

[timoore]

Hi, I don't think this the right approach, either in Cesium Native or for getting instancing working in Cesium for Unity. Cesium Native converts i3dm files to use EXT_mesh_gpu_instancing, which is also used for instancing in 3D Tiles 1.1, so any instancing implementation in runtime integrations should work with that glTF extension.

[TomLeeLive]

@timoore thank you for the comment!

my purpose is that checking 3dtiles type of converted gltf in UnityPrepareRendererResources.cpp
what is the best way to check it with considering runtime performance? checking glTF extension of converted gltf in UnityPrepareRendererResources.cpp will be better way?

[TomLeeLive]

@timoore oh I get it. for my comment above never mind!

I just add a method for checking it in UnityPrepareRendererResources.cpp

bool CheckForExtMeshGpuInstancing(
const CesiumGltf::Model& gltf,
const CesiumGltf::Node& node) {
return node.getExtensionCesiumGltf::ExtensionExtMeshGpuInstancing() !=
nullptr;
}