Recommend if you find this thread to use ViewportUVToSceneTextureUV instead of ViewSizeAndInvSize as Suggest by @DotBow. When UE uses a ScreenPercentage lower than 100 you get weird picture in picture results from masking.
Recommend if you find this thread to use ViewportUVToSceneTextureUV instead of ViewSizeAndInvSize as Suggest by @DotBow. When UE uses a ScreenPercentage lower than 100 you get weird picture in picture results from masking.