lightmap

Accept vanilla lightmap values. Input values will override lightmap valuescomputed from world state if input values are higher. Exposed for completenessbut some rendering implementations with non-standard lighting model may not honor it.

For emissive rendering, it is better to use emissive.

Convenience: set lightmap for all vertices at once.

For emissive rendering, it is better to use emissive.See lightmap.