What is ...tensionPreRenderView

Warner_V · June 4, 2020, 12:48pm

…and what to do about it?

In a project that runs 90FPS+ on 4K resolution, as soon as I start the project in VR, frame rates drop to 45 and below.

“stat scenerendering” gives me this:

Profiling doesn’t bring me any help (but if someone wants to look at the output I can send it over…).

What to do? What to try next? “…tensionPreRenderView” doesn’t even match any documents on Google.

anonymous_user_897f32ee · June 4, 2020, 1:11pm

…tension there it’s just the truncated part for something else.

Anyway, as soon as you go under 90 fps, the frame is clamped to 45 for VR.

Warner_V · June 4, 2020, 4:56pm

Yeah, I understood it was truncated, just wasn’t sure what the full name is supposed to be…

So, it must be the framerate smoothing of SteamVR forcing the FPS to 45 then.

Thanks a lot for your input!

anonymous_user_897f32ee · June 5, 2020, 6:49am

Seems that is the ViewExtensionPreRenderView stats used to profile the function


static void ViewExtensionPreRender_RenderThread(FRHICommandListImmediate& RHICmdList, FSceneRenderer* SceneRenderer)
{...}

So yeah, it’s all related to the stereo rendering setup.