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ShamblingSalesman In reply to CaptainComedy [2017-01-09 23:29:40 +0000 UTC]

Thanks for the kind words!! For these renders, I use Colorvoid, but I don't do greenscreen.

What I do is I set the background to black, and render that first. Then, I do a second render, this time overriding the map's the fog so that it:
1. is colored full white, and
2. starts and ends at 0, which completely covers the characters, therefore creating white silhouettes of them.

The commands I used for the second render were:
fog_override 1
fog_start 0
fog_end 0
fog_colorskybox 0 0 0 (this command was also used for the black background in the first render)
fog_color 255 255 255
Source's fog doesn't seem to affect the 3D skybox, so the black background is left unaffected by the white fog.

After those two renders are done, I use the silhouette render as the alpha channel for the first, full-color render.
I do this with a Paint.NET plugin called Alpha-Displacement, but I'm sure you could do it easier in something like Photoshop.

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