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Forward rendering performance drop for VR

Forward shading config settings as follows:

 r.DefaultFeature.AntiAliasing=3
 r.EarlyZPass=2
 r.EarlyZPassMovable=True
 r.DBuffer=True
 r.ForwardShading=True
 vr.InstancedStereo=True

Scene is a typical outdoor scene with a Skylight sky and directional "sun" light. After turning on forward rendering render time went from 6.55ms (deferred) to 11.05ms (forward). I have attached the reference scenes (left is deferred) and the GPU profiles. The biggest leap seems to be in computing shadows... which I was not aware would be affected by switching to the forward renderer.

alt text

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Product Version: UE 4.14
Tags:
scene.png (3.2 MB)
forwardprofile.png (77.2 kB)
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asked Dec 07 '16 at 03:49 AM in Rendering

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Dr_Jerm
103 13 15 19

avatar image Dr_Jerm Dec 08 '16 at 10:51 PM

Been poking around with it a bit more. Still haven't determined the performance loss.

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