Hi i am running in a problem whenever i am using final-gathering in my rendering during the time of animations it is giving me flickering in shadows or black patches.

i request to every one of u what is the solution for this
since increasing accuracy and playing with other options are good but doesn’t giving a true solution
i welcome any good tips and trick .

My personal request to Mr.Ashraf Aid pls have a look at this and help us at this stage.

MAYA My love

mental ray final gather calculates “final gather points” to compute the overall lighting in a scene. When it does this, it places the points only on those parts of your scene that are visible to the camera.  By default, a new set of points is calculated for each frame of an animation. When your camera or other objects in the scene move, different areas of the scene are visible to the camera, resulting in tiny differences in the calculations, which in turn result in flickering during an animation.

The solution is to pre-compute your final gather points by setting your mr render global options to “final gather only” and set “rebuild” to “off”, and run through your animation.  You can probably get away with creating the map for every fifth frame or so, then going back and manually rendering a few odd frames.  Then you set the render options back to render everything, but set the final gather rebuild to “Freeze”.  This prevents the render from re-calculating the FG on every frame, and forces it to re-use the pre-built map with constant FG points.  It’s like re-using depth map shadows, or turning off “Auto Exposure” when using glow, if you’ve ever done that.

For more detailed information on final gather, I recommend Boaz Livny’s book on mental ray; this issue is discussed at length in chapter 13.