https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442907#M7 <P>I do see different RGBA values for the "red" objects, so can you use that?</P> Thu, 24 Apr 2025 18:51:06 GMT Stephen.Blair 2025-04-24T18:51:06Z https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13441570#M4 <P>Hi, has anyone successfully configured Cryptomatte to work with GPU&nbsp;in Max 2026?</P><P>&nbsp;</P><P>While CPU rendering works fine as usual, GPU rendering produces a red output and doesn't function properly (while it supposed to be supported now, isn't it?). Are there specific settings needed to make the GPU version work? I have everything updated to the latest version as far as I can tell.</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-left" image-alt="CPU" style="width: 300px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1492410i11797698D1B94936/image-size/small?v=v2&amp;px=200" role="button" title="6k7J6CXnHL.png" alt="CPU" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">CPU</span></span><span class="lia-inline-image-display-wrapper lia-image-align-left" image-alt="GPU" style="width: 300px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1492409i5B9A9411446E91C8/image-size/small?v=v2&amp;px=200" role="button" title="OGLFm5UgW8.png" alt="GPU" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">GPU</span></span></P><P>&nbsp;</P> Thu, 24 Apr 2025 05:24:39 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13441570#M4 AlphaMax9 2025-04-24T05:24:39Z https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442313#M5 <P>That's just the preview. GPU doesn't output the now deprecated preview.</P> <P>The Cryptomatte layers are still there and will work in Nuke. Or is that a screenshot from Nuke?</P> Thu, 24 Apr 2025 13:20:01 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442313#M5 Stephen.Blair 2025-04-24T13:20:01Z https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442404#M6 <P>It's not Nuke - Just Arnold render view (attached).&nbsp;</P><P>In Photoshop, for certain projects, the preview colors can also be useful. So CPU is the way to go for such cases.</P><P>Thanks for your reply</P><P><span class="lia-inline-image-display-wrapper lia-image-align-left" image-alt="BOLTQU1IW3.png" style="width: 300px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1492604i5CD5DA7D76DE97AF/image-size/small?v=v2&amp;px=200" role="button" title="BOLTQU1IW3.png" alt="BOLTQU1IW3.png" /></span></P> Thu, 24 Apr 2025 15:13:31 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442404#M6 AlphaMax9 2025-04-24T15:13:31Z https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442907#M7 <P>I do see different RGBA values for the "red" objects, so can you use that?</P> Thu, 24 Apr 2025 18:51:06 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13442907#M7 Stephen.Blair 2025-04-24T18:51:06Z https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13443389#M8 <P>Yes! that's a good workaround - as long as we don't have too many objects/materials. While Crypto is not intended to be used like this, it's a quick and effective mask selection in PS.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="AlphaMax9_0-1745545753624.png" style="width: 300px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1492809i9A533833EDF4D816/image-size/small?v=v2&amp;px=200" role="button" title="AlphaMax9_0-1745545753624.png" alt="AlphaMax9_0-1745545753624.png" /></span></P><P>&nbsp;</P><P>When it comes to proper layer extraction, I realized I can no longer get it to work in After effects. Regardless of CPU or GPU. Looked up this tutorial, and even author says it’s no longer working since recent updates. Is this a known issue?</P><P>&nbsp;</P><P><A href="https://youtu.be/02my1T_-vyY?si=YER05FfAPbthOvD7&amp;t=210" target="_blank">https://youtu.be/02my1T_-vyY?si=YER05FfAPbthOvD7&amp;t=210</A></P><P><div class="video-embed-center video-embed"><iframe class="embedly-embed" src="https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fwww.youtube.com%2Fembed%2F02my1T_-vyY%3Fstart%3D210%26feature%3Doembed%26start%3D210&amp;display_name=YouTube&amp;url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D02my1T_-vyY&amp;image=https%3A%2F%2Fi.ytimg.com%2Fvi%2F02my1T_-vyY%2Fhqdefault.jpg&amp;type=text%2Fhtml&amp;schema=youtube" width="200" height="112" scrolling="no" title="3DS Max Arnold UV Pass and Cryptomatte Pass to After Effects Quick Start" frameborder="0" allow="autoplay; fullscreen; encrypted-media; picture-in-picture" allowfullscreen="true"></iframe></div></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="AlphaMax9_1-1745545996937.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1492810i5B0B3218E2F02B44/image-size/medium?v=v2&amp;px=400" role="button" title="AlphaMax9_1-1745545996937.png" alt="AlphaMax9_1-1745545996937.png" /></span></P><P>&nbsp;</P> Fri, 25 Apr 2025 01:55:59 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/can-t-get-cryptomatte-to-work-with-arnold-gpu-in-max-2026/m-p/13443389#M8 AlphaMax9 2025-04-25T01:55:59Z