<div dir="ltr"><div>I wish I could tell Cycles which pixels to render using a Mask or bitmap - where render Border is insufficient (and can't be animated, or loaded from a texture).<br><br></div><div>I'm working on a system to turn 2D projects into 3D visuals automatically.<br></div><div>If I could re-render only the pixels that are really needed I could save a lot of rendering time and greatly increase the systems performance.<br><br></div><div>I have a lot of little things that change accoring to a texture that is generated from a user's design. But a lot of the image is the same - so why rednder it all, while I can load it back form an image file to and alpha over only what is really chaning form project to project?<br><br></div><div>I can't fake this with holdout materials (to make Cycles render nothing - saving time, becasue that redners very fast, because I need to have refelction between static and dynamic objects - and holdout would block these.<br><br></div><div>Hmm - maybe I could use a mask in front of the camera using holdout but only for camera rays, letting the rest to render?<br><br></div><div>What do you think? Would such a feature we of good use, or maybe it's a waste of time and can be worked around?<br></div><div><br clear="all"></div><div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>- Tobiasz 'unfa' KaroĊ<br><br></div><div><a href="http://soundcloud.com/unfa" target="_blank">http://soundcloud.com/unfa</a><br></div></div></div>
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