light map questions?

Blitz3D Forums/Blitz3D Programming/light map questions?

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I would like to know how do you apply lightmaps to a 3d model. Can this be done with programming or do you have to purchase an external lightmapping software? Is the lightmap an added texture map to the model? i.e. If you have a terrain, you make your heightmap and texturemap, but what about lighting? How does this work?