Hi MonkeyScience. Such awesome work! Have you ever considered supporting the Smart IBL (sIBL) standard? For anyone not familiar with is, sIBL is a format for packaging the reflective,diffuse, and specular maps which make up an HDRI lighting environment. Its really just a .zip file that adheres to certain naming conventions. It also provides a mean for defining light sources based on the lighting information in the HDR images. So, for example, if there is a sun in the image, the sIBL creator software will figure out it's apparent direction and then store this image in the sIBL archive. This info could be read in by Unity and used to create a directional light. I think it would be cool if SkyShop could read and write this format.