220.127.116.11.2 3-D Drawing Resources
Three-Dimensional Drawing Resources represent all information necessary to rasterize 3-D objects. Unlike 2-D primitives, 3-D objects are always built out of meshes, with no higher-level primitives specified. These resources are grouped into five subcategories: 3-D geometries and meshes, cameras, lights, transforms, and models. These resources are conceptually similar to those described in [OPENGL], with the significant exception that the coordinate system specified by this protocol is left-handed; that is, the direction of positive values for the Z-axis is away from the observer and toward the screen.