I noticed the environment light (dome light with texture) is not shown in the viewport.

Houdini VK:

RPR:

@ShinFujieda -san,

Thank you very much for the information in detail. I made a commit which avoids 1.0 depth when alpha is 0.0 and uses 0.99 (distinguishable even with 8-bit unsigned or 8-bit signed framebuffer). Does this help?

Screenshot for reference:

@ShinFujieda -san,

Thank you for the review! If I set dstHi to 0.99f, all the grid and gizmos disappear. Is it better to keep as 1.0 or still update?

I see. then I don't know how it's treated, but maybe the 1.0 value is reserved for such special components.
Then, let's keep it as 1.0 for now.