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Johnny Maunason

Shader greyscale map from illumination?

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Hello!

 

I'm trying to figure out how to make a shader that can create a greyscale map based on how much an object is illuminated by for example a spot light. Any ideas on how to achieve this?

 

Creating a vertex map could also work, but other than some clunky X-particles workaround I can't come up with a solution for that either. Feels like I might be overlooking something obvious..?

 

Thanks in advance for any help on this!

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I believe the Lumas shader generated a GS based on the area seen by the light, people use it for making the dark side of the earth in those space shots.

 

might help you out at some point

 

Deck

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