Learn how the size of objects is represented in a HDRI environment.
Let’s take some time to understand how the size of objects is represented in a HDRI environment. The most common type of HDR image format used for lighting in CG rendering is the Equirectangular format. This rectangular image format has a ratio of 2:1 and when mapped onto a sphere it correctly represents the viewpoint looking around a full 360 degrees in all directions from a point in space. These images can be created in a number of ways, but for the purposes of this discussion, lets imagine they are being captured with a Spheron camera system.