ZDoom

Okay, so I did find that the lights use ShouldLightActor. I'll try taking a a look around for the geometry code.

I don't think you need to bother with this, unless the solution is really simple.

I'll do some more searching around in a bit. None of the flags are showing up in the search so I'm wondering what is missing in particular.

Honestly I wasn't even aware that rendering engine supported dynamic lights.

So we're still in the same spot: Advanced feature not implemented in the software renderer...

This isn't related to baked lightmaps, but actually this feature by MajorCooke: https://github.com/coelckers/gzdoom/commit/31fa78d7c9b111a341018071d42bcd7b22c0cd61

Pinging MajorCooke to take look at this.

(unsurprising that this doesn't work in the software renderer; judging from that commit, none of the software renderer files were modified)

The software renderer does not have lightmaps so any feature related to it won't do anything.

When "Render Mode" is set to "Hardware accelerated", dynamic lights with the property "dontlightmap 1" work as intended. When "Render Mode" is set to either "Doom Software Renderer" or "True Color SW Renderer", dynamic lights with "dontlightmap 1" still light up the maps' geometry. I tested this with heretic.wad.