[4.19] Planar reflections performance in VR

jinzay
Mon, 23 Apr 2018 11:59:50 +0000
XR Development

Hey all, i have issues getting the planar reflections to behave as usual.
My scene renders well in 4.18 + VR but with just “switching” the unreal version i cant even get below 30 ms anymore.
The gpu profiler tells me a frame needs below 7ms to render so it must be some kind of misconfiguration or bug affecting the game thread or something else. When i remove the planar reflection it returns back to normal.

Steps to reproduce:
0. Download Project files to skip the following steps: https://we.tl/6TI8sjgDk1

1. Create Project with Realistic Render Template for each version (4.18 and 4.19)

2. Enable Forward Shading, MSAA, Global Clip Planes

3. Let the shaders recompile

4. Add Planar Refleciton to scene and change the floor material to be able to recieve it.

5.Watch in VR
Result on my 1070 Laptop:
4.19 45fps or less
4.18 90fps

(i tought maybe the new resolution thing might be the case but it is still visible with r.screenpercentage 130 in 4.18 and vr.pixeldensity 1 on 4.19)

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