[Algorithms] Lightmap Terrain

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Hi!

I trying to find how to generate a lightmap/illumination/shadow on a
terrain.
Do you know some good tutorial/code/links talking about that?

I want something to generate a lightmap on a (1025x1025 terrain). A good
generation
if possible like compute the the light from a point. I want generate the
lightmap
just before the use of the terrain and i dont want something that i need to
pre-calculate and put the result on a file or something like.

Thanks,
Corrosif