<div dir="ltr">I would go for a mask in front of the camera with mix shader, mix inputs are hold out and transparent, mix factor is your texture.</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 21, 2016 at 2:51 PM, Tobiasz Karoń <span dir="ltr"><<a href="mailto:unfa00@gmail.com" target="_blank">unfa00@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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?<span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888"><div><br clear="all"></div><div>-- <br><div data-smartmail="gmail_signature"><div dir="ltr"><div>- Tobiasz 'unfa' Karoń<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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