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Camera Projections are the lens through which RenderMan views the digital scene. RenderMan comes with some built-in camera projections: perspective, orthographic, sphere, cylinder, and torus. Additionally, you can create custom projection plugins using C++. Both types of projections are available in RenderMan for Katana.
Built-in Camera Projections
The default projection type will use the projection specified either in the CameraCreate node or the Alembic_In camera. The choices are perspective and orthographic.
Custom Projection Plugins
Custom Projection plugins, such as PxrCamera, are created with a Material or PrmanShadingNode and assigned to /root with a MaterialAssign node. Just like projection modifiers, only one custom projection plugin can be used at a time in conjunction with a default projection.
