Enhancement: Make overlays stop z-fighting in Hammer

[HugoBDesigner]

What would this enhancement be for?

Hammer

Describe your enhancement suggestion in more detail

I understand that overlays z-fight in Hammer because they're lacking the $decal 1 material parameter. But in-game, they still more often than not render perfectly fine without it.

I believe Hammer should treat all textures in overlays as though they had that parameter.

[November-N]

This was marked as completed in 2023 with issue #709 , ill ask @SCell555

[SCell555]

Overlays are rendered 0.00001 units away in the normal direction of the brush they are on from their real position.

[HugoBDesigner]

If that is the case for Hammer, then 0.00001 might be a distance too small. Here in this video, I tried getting as close to the overlay as possible but it would still z-fight. Meanwhile, an overlay with $decal 1 would render slightly above the surface it was placed on, and would even become increasingly offset from it as the distance from the camera increases:

hammer_2026-01-24_16-33-21.mp4