[Algorithms] LightMaps

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Hi,

I want to introduce static light maps, is there any utility out there which 
will precompute the lightmap textures out there if I give it a bunch of 
lights and triangles to play with?

Also, is it necessary for every tri to have it's own lightmap texture or is 
it better to just stick to a few basic lightmaps and put them all into one 
texture?

Regards,

John.