Imitating volumetric lights

[Pebble]

Hello all, I have been playing Doom on and off for many years and dabbled in Doom Builder for a couple days several years back.  Having recently jumped back into said dabbling I've been learning a lot, but there is something escaping me on the topic of lighting. 

 

In Tormentor667's various maps among others I have noticed what I assume is a mid texture imitating a light shaft, and was wondering how this is achieved.  Any help would be appreciated, thanks!

 

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[Edward850]

You actually already said the answer:

26 minutes ago, Pebble said:

what I assume is a mid texture imitating a light shaft

You assumed correctly. That's all it is, a mid texture pegged/offset to the ceiling. The texture itself is just a solid colour with a gradient alpha. Absolutely nothing special about it at all.

 

This only works in ports that support a texture alpha channel, of course.

Edited March 23, 2022 by Edward850

[Pebble]

Thanks for the response friend, I had a hunch it related to alpha channels and will do some experimenting.