Blog: Some notes from the hidden MR production shaders in Maya
These notes are in progress and have not really been edited yet. I just thought I'd do a first pass. I will go back thru and do a final pass in a few weeks.
First off to use the hidden MR production shaders in Maya you will need to shoot a mirrorball, the mirrorball should be placed in the exact spot you are going to have your cg element sit. Crop the mirror ball image to the edges of the mirror ball. You will also need to shoot a background image. Create a camera in the scene, under the environment tab, assign an image plane and load your background image. Make sure your Maya cameras filmback matches your background plate. You can check the camera properties in Adobe Bridge and find the focal length of your camera, make sure your Maya camera matches. Under the render settings make sure the resolution gate matches the image size. Check the "Device aspect ratio" under the common tab in the render settings match the "Film Aspect Ratio" in the cameras filmback. Drop your object in the scene and try to match the perspective (ie, the position of the camera).