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Dynamic light caching and dynamic buffer

Does setting the buffer usage flag to BUF_Dynamic automatically affects the dynamic light caching for this mesh? For my test mesh, it seems that just by changing this flag, the ShadowDepths statistic goes from ~12.52ms to ~21.03ms.

On the other hand, setting the proxy's bGoodCandidateForCachedShadowmap to false or the Mobility to Movable (as per IsMeshShapeOftenMoving()) doesn't seem to raise the same statistic (it does degrade the overall performance a little tho).

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Product Version: UE 4.19
bufdyn.jpg (56.6 kB)
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asked Jun 25 '18 at 01:16 PM in Rendering

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Exactly which buffer are you changing in the engine? BUF_STATIC vs BUF_DYNAMIC is going to move you from D3D11_USAGE_DEFAULT to D3D11_USAGE_DYNAMIC which could have various effects depending on the driver and HW.

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answered Jul 28 '18 at 01:39 AM

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Waurelius STAFF
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avatar image phoboz Jul 28 '18 at 05:27 AM

At the moment I have a static vertex buffer with dynamically constructed index buffer - essentially a dynamically built LOD

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