https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055172#M1048 <P>Did you try increasing the global specular ray depth? While that solution might have been in the maya hair shader arnoldanswer that Stephen linked to, that should also apply to Arnold hair shader since under the hood it's all the same.</P> Thu, 30 Apr 2020 16:08:44 GMT thiago.ize 2020-04-30T16:08:44Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055164#M1040 <P>I am facing issue while I am rendering Fur with Arnold CPU everything works fine but the moment I changed it to GPU it renders Fur with any textures and takes longer time than CPU. I am using RTX 2070 with Ryzen 3700x with Arnold Version 4.4.1.</P><P>Please let me know what I am doing wrong.</P> Wed, 27 Nov 2019 07:41:51 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055164#M1040 Anonymous 2019-11-27T07:41:51Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055165#M1041 <DIV class="fr-view clearfix"><P>So far no one even tried to check if I am right or wrong , Very Sad</P></DIV> Thu, 30 Apr 2020 13:47:23 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055165#M1041 Anonymous 2020-04-30T13:47:23Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055166#M1042 <P>Can you post Arnold logs (verbosity level Detailed) for CPU and GPU renders, so we can see what's happening?</P><P>When you say GPU takes longer, are you allowing for the GPU pre-population time?</P> Thu, 30 Apr 2020 14:07:31 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055166#M1042 Stephen.Blair 2020-04-30T14:07:31Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055167#M1043 <P>Also GPU render image with fur is darker than CPU render image with fur .I'll post Arnold log soon</P> Thu, 30 Apr 2020 14:15:45 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055167#M1043 Anonymous 2020-04-30T14:15:45Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055168#M1044 <P>Maybe this?<BR /><A href="https://answers.arnoldrenderer.com/questions/16761/maya-hair-shader-doesnt-work-properly-on-gpu-vs-cp.html">https://answers.arnoldrenderer.com/questions/16761/maya-hair-shader-doesnt-work-properly-on-gpu-vs-cp.html</A> </P> Thu, 30 Apr 2020 14:25:47 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055168#M1044 Stephen.Blair 2020-04-30T14:25:47Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055169#M1045 <P>I am not using Maya Hair Shader, I m using Arnold Hair Shader not even Al hair shader, I have used it with Houdini Fur </P> Thu, 30 Apr 2020 14:32:21 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055169#M1045 Anonymous 2020-04-30T14:32:21Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055170#M1046 <P>There's no "Maya Hair" shader, whatever the user did in Maya, it ends up as an Arnold hair shader.</P> Thu, 30 Apr 2020 15:34:10 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055170#M1046 Stephen.Blair 2020-04-30T15:34:10Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055171#M1047 <P>There is no link to Maya here, I am using Arnold hair shader with Houdini Fur just to make it easier for understanding</P> Thu, 30 Apr 2020 15:55:22 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055171#M1047 Anonymous 2020-04-30T15:55:22Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055172#M1048 <P>Did you try increasing the global specular ray depth? While that solution might have been in the maya hair shader arnoldanswer that Stephen linked to, that should also apply to Arnold hair shader since under the hood it's all the same.</P> Thu, 30 Apr 2020 16:08:44 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055172#M1048 thiago.ize 2020-04-30T16:08:44Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055173#M1049 <P>@Thiago Ize I am using Houdini and your solution isn't logical why should I need to raise ray depth while using GPU when CPU is rendering fine, Maybe I am wrong</P> Fri, 01 May 2020 02:26:09 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055173#M1049 Anonymous 2020-05-01T02:26:09Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055174#M1050 <P>Because the GPU code path doesn't yet support the extra_depth param on the hair shader, so you need to globally increase the specular ray depth. Please give it a try.</P> Fri, 01 May 2020 03:04:15 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055174#M1050 thiago.ize 2020-05-01T03:04:15Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055175#M1051 <P>I raised the specular ray depth to 64 as suggested by you to 64 just to see if it is working but it is not working and I think Solidangle knew about it too</P> Fri, 01 May 2020 11:12:36 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055175#M1051 Anonymous 2020-05-01T11:12:36Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055176#M1052 <P>How would check verbosity when on GPU it totally disregards the texture and renders with plain color </P> Fri, 01 May 2020 11:14:13 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055176#M1052 Anonymous 2020-05-01T11:14:13Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055177#M1053 <P>Just to be clear, this didn't make your gpu fur less dark? Or are you referring to the missing texture issue, which yeah, the specular depth has nothing to do with. At this point I think it'll help if you post a comparison cpu/gpu image so that we're all on the same page. Complete logs with stats could also help.</P> Fri, 01 May 2020 17:20:44 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/11055177#M1053 thiago.ize 2020-05-01T17:20:44Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/12013407#M1054 I know this thread is old, but I hit this issue and tried increasing Render Settings &gt; Arnold &gt; Ray Depth &gt; Specular to 16, and it didn't make any difference. Any other ideas?<BR /><BR />Maya 2023, MtoA 5.3.1.1 - 6e67ae93 (fix-5.3.1) . Tue, 06 Jun 2023 03:12:05 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/12013407#M1054 aaronc8X89K 2023-06-06T03:12:05Z https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/12027624#M1055 <P>Please show some images and your settings.</P> Mon, 12 Jun 2023 12:46:54 GMT https://forums.autodesk.com/t5/arnold-gpu-forum/difference-between-arnold-gpu-and-cpu-rendering/m-p/12027624#M1055 Christoph_Schaedl 2023-06-12T12:46:54Z