Grounding Shadows question

Target Platforms XR
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1

Hi, The MeshRenderers of my model are not on one Mesh. The Mesh in the model are distributed on GameObjects at different levels. Can I directly add the Grounding Shadows component on the Root GameObject to obtain the shadow effect?

Currently I don’t see shadows when I do this. If it doesn’t work, do I need to attach the Grounding Shadows component to each MeshRenderer?

2

You cannot attach it to the root. It needs the MeshRenderer so you would have to add one to each object in this case.

3

Thanks your response.

Is the performance overhead of this component high? If the model is more complex

4

We haven’t done any performance testing, but I wouldn’t expect the additional overhead per-MeshRenderer to be very high. I suspect that RealityKit simply renders a single shadow map for the grounding shadows, and that adding additional MeshRenderers simply means that they are rendered to that single map.

5

Through my testing, when I added the Shadow component to each MeshRenderer, AVP directly crashed and restarted (show apple logo). It seems that Shadow component also has a limit on the number of triangle data.

Models with relatively small triangular surfaces can be displayed, but the FPS is already very low.

6

Good to know! Unfortunately, this isn’t something that we have any control over or a way to fix. We simply translate our VisionOS Grounding Shadow component to the equivalent in RealityKit, GroundingShadowComponent. I would recomment submitting feedback to Apple about this issue via their Feedback Assistant app.