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Instancing support #687

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lilleyse opened this issue Feb 14, 2024 · 1 comment
Open

Instancing support #687

lilleyse opened this issue Feb 14, 2024 · 1 comment

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@lilleyse
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Once instancing is supported in cesium-native (CesiumGS/cesium-native#458) we'll need a way to convert EXT_mesh_gpu_instancing to instanced USD/Fabric geometries.

See UsdGeomPointInstancer as a potential starting point. Not sure what the equivalent Fabric representation looks like.
@lilleyse
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I found some sample data from the OpenUSD website: PointInstancedMedCity.zip

image

I saved the Fabric stage (fabric_stage.zip) and had a look at the Fabric representation. The instanced meshes have an _instancerPath attribute which points to a prim that has instanced positions, orientations, scales. With more reverse engineering we should be to replicate this in FabricGeometry.

How to save the Fabric stage:

  • Click the "Save Fabric Stage" button in the Cesium Power Tools window
  • Opencesium-omniverse/exts/cesium.powertools/fabric_stage.txt

@lilleyse lilleyse mentioned this issue Feb 19, 2024
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@lilleyse