Enhancement: Support envmap-type light cookies #1583
Description
What would this enhancement be for?
Rendering
Describe your enhancement suggestion in more detail
Light cookies are currently supported as a single texture projected either in a single direction from a light_rt_spot or from six when applied to a light_rt. Supporting envmap textures would allow light_rt ents to project a different texture for each face, enabling more intricate light patterns (e.g. from a complex light fixture). Cookie textures would be selected the same way they currently are, but if the entity is a light_rt, and the texture is detected as an envmap, each side of the envmap would be assigned to the corresponding side of the light.
