cskapi#14366
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Of course, the light map has some limitations:
Like the irradiance map, it is view-dependent and is generated for a particular position of the camera.
Currently the light map works only with VRay materials.
Like the photon map, the light map is not adaptive. The illumination is computed at a fixed resolution, which is determined by the user.
The light map does not work very well with bump maps.