I want to create a viewshed analysis with Blender. Something like this:
I tried it using light in Blender Render and Cycles but I can't get it to work due to the light fall off. I have already set the light bounces to 0.
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You can do that easier in a compositing step.
The shadow pass hold exactly that information: where light hits and where not. The intensity isn't relevant. It is also antialiased.