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The Camera Settings window can be accessed through the Exposure Value button on the V-Ray for Revit Ribbon.

Mode – – Specifies the type of camera to use for rendering. The cameras in V-Ray generally define the rays that are cast into the scene, which essentially is how the scene is projected onto the screen. V-Ray supports several camera types:

Standard Camera – A traditional pinhole camera.
VR Spherical Panorama – Spherical camera with independent horizontal and vertical FOV selection that is useful for generating latlong images for spherical VR use. 
VR Cubemap – A variant of the Box camera with the cube sides arranged in a single row. Unlike the Box camera's output, Cube6x1 does not produce an empty space in the output image and is useful in generating cubic VR output.

Stereo  – Enables or disables the Stereoscopic rendering mode. Stereoscopic images will be rendered Side-by-side or Top-bottom based on the Output Layout option. You do not need to re-adjust the image resolution as it will adapt automatically. Note that when current view is set to an ortho 3D view, the Mode is locked to Standard Camera and this option is unavailable.