0e01fa4863
from Tom Edwards (artfunkel), with minor edits. This patch makes the following improvements to environment map scripting: * Adds a "is_valid" RNA property to envmaps. True if the map is ready for use, False if it needs rendering. * Adds a "clear" RNA function to envmaps. Deletes any envmap image data. * Adds a "save" RNA function to envmaps. Writes the envmap to disc with a configurable layout. (Defaults to the current hard-coded layout.) * Updates bpy.ops.texture.envmap_save with configurable layout support as above. These changes, particularly configurable layouts, make exporting envmaps to other software much easier.