Is masking performance costly?

[pickersZ]

@Deathrey

You can enable mask in early depth only in project settings to have zero overdraw on masked objects, provided that you are using early z pass.

@OwenWP

Since there are a lot of project settings that can affect the behavior of the prepass, I strongly suggest checking the behavior using something like RenderDoc (which has a convenient engine plugin included with UE4). You can see exactly when it is rendering what, and there is a view mode that shows you which pixels for a given draw call were early-Z rejected, allowing the shader to be skipped.

Thank you guys for the information. I will play around with the settings to check on the masking performance effects.

Looks like i have barely scratch the surface of rendering forum in unreal. You guys have been great help.