My DECORATE definition doesn't work for some reason

I see one issue at least with your GLDEFS. You should not be attaching the light to an object within a light definition. Move that last bracket so that it's after Dontlightself instead.

I copied your code (and replaced the sprite name to TRED), and it didn't give me an error. Is there anything else at all in your DECORATE or is that the entire thing?

Are you by chance using an ancient version that doesn't support that DECORATE format?

There is indeed another actor definition right after, but it's basically the same and causes the same bug. There's also a GLDEFS lump, though, which calls for this one, and that might be the issue. I removed the "#include DECORATE" from the GLDEFS, and now I got a "Unknown tag: object" error in the GLDEFS. Really weird, given that even if I use an example from the ZDoom wiki it still refuses to work. Here's the GLDEFS code :

pulseLight TECH
{
color 0.1 0.0 1.0
size 16
secondarysize 64
interval 2
Dontlightself 1

object BlueTechLamp
{
 frame BTLP {light TECH}

}

}

36 minutes ago, Nevander said:

I see one issue at least with your GLDEFS. You should not be attaching the light to an object within a light definition. Move that last bracket so that it's after Dontlightself instead.

Yep, that was it. Stupid me.

Thanks a lot !