# vray clippers multiplies render times by 4 on a complex scene. **URL:** \ **Category:** Issues\ **Created:** [March 26, 2024, 1:57pm UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488 "2024-03-26T13:57:56Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![christophe\_bertrand1](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@christophe\_bertrand1](https://forums.chaos.com/u/christophe_bertrand1)\ **Post date:** [March 26, 2024, 1:57pm UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488/1 "2024-03-26T13:57:56Z")
Hello i unarchived a max2021 + vray 5 scene and update it to max 2024 + vray 6.20 this scene is quite heavy (~55Go peak Ram usage) on my reference computer the scene took 1h23min to render (6000x3000) with vray 5 now it takes more or less 7 hours. (same sampling, same size, same assets etc.) what have you done to vray guys ? 🙂 After some investigations, i found vray clipper is guilty. I join two pictures. here there is no clipper (!) ![clipper01.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/c/f/cf53a28a9d2dcd7e8b8fe13bb99fbaf65f1b9ba0.jpeg) but here the whole scene is “behind” a vray clipper. ![clipper02.jpg](https://europe1.discourse-cdn.com/chaosprd/original/2X/3/36b69360d138cc2a011b27da234252913754c730.jpeg) I can see the number of unshaded rays increased a lot. Ok i suppose it’s normal. Each ray has to check wether it is clipped or not. But what is less normal, is why vray 5 was able to render my scene within 90 minutes when vray 6 needs more than 400 minutes ! What have you done to the clipper ? In this simple example i have “only” a 50% render time increase, but on a real production ready scene, it’s a x4… 99% of the rays shot by vray are unshaded rays. i have an “old” computer with vray 5.20.02 ![clipperVray5.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/b/8/b8b96fc2a5901e6253c1f8736b8da5c7152d1dc0.jpeg) the render time is pointless since it’s not the same cpu. What is important on this picture is i have only 6754 unshaded rays Vs 37 844 452 (lol it’s a 5 603 factor) Could you please send me the old vrayclipper.dlo ? 🙂 well seriously, is there a workaround and what changed behind the scene between vray 5 and 6 about clipper ? ![clipperVray5.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/b/8/b8b96fc2a5901e6253c1f8736b8da5c7152d1dc0.jpeg) ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [March 26, 2024, 4:07pm UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488/2 "2024-03-26T16:07:06Z")
Hi, thanks for posting. Is that Chaos Scatter? Have you tried to test without scatter but other geometries with lots of polygons? I am not able to reproduce this issue in a simple scene consisting of Chaos Scatter (cosmos assets) and a V-Ray Clipper. Could you send us your scene for a test? You can do that here or trough our [support contact form](https://support.chaos.com/hc/en-us/requests/new). ---
**Author:** ![christophe\_bertrand1](https://avatars.discourse-cdn.com/v4/letter/c/57b2e6/32.png) [@christophe\_bertrand1](https://forums.chaos.com/u/christophe_bertrand1)\ **Post date:** [March 27, 2024, 8:22am UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488/3 "2024-03-27T08:22:07Z")
Hello thank you for your quick answer. i prepared two clean scenes with instanced teapots. One rendering using 6.2.0 and the other using 5.2.0. There are 10 times more unshaded rays with 6.2. Here a sample screen of an unfinished rendering of my production scene. As you can see, \>97% of the total raytracing is unshaded. If i remove the clipper, the scene renders fast. But my customers ask for it. As a workaround, i will use native 3dsmax slice to remove geometry before rendertime. ![prod.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/4/44716f4906381b559e6fc8483751f6b856ef00e7.jpeg) I send scenes to support, tyvm ++ ---
**Author:** ![vladimir\_krastev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir_krastev/32/42177_2.png) [@vladimir\_krastev](https://forums.chaos.com/u/vladimir_krastev)\ **Post date:** [April 15, 2024, 12:34pm UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488/4 "2024-04-15T12:34:46Z")
Hi, after a lot of tests I can confirm that VRayClipper in V-Ray 6 is rendering slower. The issue is reported as a bug under VMAX-14100 in our system. ---
**Author:** ![Davers](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/davers/32/3489_2.png) [@Davers](https://forums.chaos.com/u/Davers)\ **Post date:** [April 29, 2024, 11:57am UTC](https://forums.chaos.com/t/vray-clippers-multiplies-render-times-by-4-on-a-complex-scene/118488/5 "2024-04-29T11:57:51Z")
I’m glad I found this thread. I was using VRayClipper to reveal parts of a building and was getting render times of 00:12:49 per frame. Deleting the VRayClipper modifiers from the scene to render the post-reveal frames knocked my times down to 00:01:28!