> What? It's the indirect reflection of the sun, specularly reflected
I am pretty sure the standard use of "indirect lighting" in normal computer graphics jargon means light that has had at least one diffuse reflection on its path. Even Merriam-Webster lists this meaning [1].
You'd just need to run the ray-tracing from light sources algorithm, to map the intensity of the specular reflection of the building. This would be equivalent to just creating the photon map. Then you could just view the photon map directly, to see the intensity of the death ray. There would be no need to render the scene (although you could, if you wanted a photorealistic view).
I am pretty sure the standard use of "indirect lighting" in normal computer graphics jargon means light that has had at least one diffuse reflection on its path. Even Merriam-Webster lists this meaning [1].
You'd just need to run the ray-tracing from light sources algorithm, to map the intensity of the specular reflection of the building. This would be equivalent to just creating the photon map. Then you could just view the photon map directly, to see the intensity of the death ray. There would be no need to render the scene (although you could, if you wanted a photorealistic view).
[1] http://www.merriam-webster.com/dictionary/indirect%20lightin...