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If you already have two separate cameras for the left/right eye in the scene (animated, or perhaps imported from somewhere) you can create a V-Ray Stereo Rig from Rig from Create menu > VRay > Create Stereorig from cameras. You will be prompted to choose the left and right cameras. A center camera will be created and it will be constrained between the other two based on their positions and orientations. You may choose to explicitly say which camera from the scene should act as the center one (in case you have such) and no constraints shall be applied on it. The center camera is used for rendering Shade Maps.

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After creating the rig, the three cameras get linked with attributes which you can see in the Extra Attributes section of the Attribute Editor of each camera. The center camera will have links to both the left and right cameras and will also have an option for where to search for the Stereoscopic Camera Attributes. This way the attributes may be attached to any of the the cameras you choose. The default is the center.

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Before attaching the Stereoscopic camera extra V-Ray attributes to the main one, all the cameras will function normally, but . But after attaching the attributes and enabling the stereo, any attempt to render from any of the three cameras will result in a stereo render from the left/right cameras next to each other in the VFB, just like with the Maya Stereo Rig.

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