UE5.1 WPO foliage shadow by hardware ray tracing in lumen

Development Rendering
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1

I have a problem with Hardware Ray tracing shadows in a Lumen environment.
When the WPO wind effect foliage is set to Nanite, the wind movement in the shadow stops.
If Hardware Ray tracing shadow is turned off and
Virtual Shadow Map is applied, the wind effect appears in the shadow.
Is this a limitation of the specification? Or can it be improved by changing some settings?

2

I had the same problem.

3

You have to enable “Evaluate WPO for raytracing” in the mesh settings. By default this is disabled because it requires the BVH to be constantly regenerated and incurs a performance hit which can be extreme in some cases.