Gpu memory leak in CubemapHelpers::GenerateLongLatUnwrap?

Development Programming & Scripting
1

The RenderTargetLongLat object of type UTextureRenderTarget2D created inside CubemapHelpers::GenerateLongLatUnwrap appears to be leaked. Running this function frame after frame causes a GPU memory crash with texture allocation. Calling ConditionalBeginDestroy() on the render target has fixed the problem, though I am not sure what is the most appropriate deallocation method here. https://github.com/EpicGames/UnrealEngine/blob/master/Engine/Source/Editor/UnrealEd/Private/CubemapUnwrapUtils.cpp#L88

It looks like this issue would still be present on the master branch, despite the transition to the NewObject<> allocation method.

2

Hi num3ric,

I just wanted to let you know that we have started looking into this issue. Do you have any additional information that will help us to reproduce the memory leak?

3

Hey num3ric,

Ah, the render target needs its resource explicitly freed (rather than waiting for GC to occur).
try adding:

// Clean up.
RenderTargetLongLat->ReleaseResource();
RenderTargetLongLat->RemoveFromRoot();
...

I’ll add this to main branch too. Thanks!