Sometimes we need to render an animation of a scene in which only a small portion is changing in each frame of the sequence. For example, we want to render a realistic human face in which only eyes are blinking or moving. Other parts of the scene like mouth, cheek, forehead, hair, etc., are not changed at all during the whole animation. Though one may argue that there is no absolutely still object according to perhaps philosophy, at least this is the case for some special applications, for example, rendering out a synthesized motion for psychological or perception experiments. In these circumstances, we typically have to render the whole scene in which more than 70% of an output image is identical across the whole animation sequence. I think it is a waste of rendering computation. Only the first frame needs to be rendered, and all the subsequent frames can be obtained by simply copying the imaging outcome of the first frame. To facilitate this, Maya (or Arnold) UI can provide a specific dialog so that users can specify a region which will be rendered every frame, or inversely, a region that remains the same in every frame except the first one. Then Maya will save the users' time by rendering only what needs to render in each node of the render farm, duplicating the still portion of the scene from the first frame, and finally compositing the region of interest rendered with still portion together to form the final output image. This idea comes directly from practical use case of Maya, so I believe this partial rendering capability with copy and composite may be needed by many other users. Hoping Autodesk can consider my idea. Thank you for voting.
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