# Multimatte element not working as expected **URL:** \ **Category:** Issues\ **Created:** [August 25, 2020, 5:05pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134 "2020-08-25T17:05:47Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Alex\_M](https://avatars.discourse-cdn.com/v4/letter/a/77aa72/32.png) [@Alex\_M](https://forums.chaos.com/u/Alex_M)\ **Post date:** [August 25, 2020, 5:05pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/1 "2020-08-25T17:05:47Z")
Please check the image below. Why does my Multimatte channel look like this? ![vray5_multimatte.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/a/8/a8239b3d7a80a782b61f6fd5d21db1d357b04697.jpeg) ---
**Author:** ![hermit.crab](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/hermit.crab/32/46825_2.png) [@hermit.crab](https://forums.chaos.com/u/hermit.crab)\ **Post date:** [August 26, 2020, 8:03am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/2 "2020-08-26T08:03:23Z")
Could you send the scene to [support@chaosgroup.com](mailto:support@chaosgroup.com) so we can take a look? ---
**Author:** ![Alex\_M](https://avatars.discourse-cdn.com/v4/letter/a/77aa72/32.png) [@Alex\_M](https://forums.chaos.com/u/Alex_M)\ **Post date:** [August 26, 2020, 10:46am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/3 "2020-08-26T10:46:15Z")
Ok, email sent. Ticket number is **315-228-3075**. ---
**Author:** ![hermit.crab](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/hermit.crab/32/46825_2.png) [@hermit.crab](https://forums.chaos.com/u/hermit.crab)\ **Post date:** [August 26, 2020, 12:03pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/4 "2020-08-26T12:03:31Z")
Thanks for the provided scene. Everything seems to be working fine. It is possibly a viewport hiccup since the diffuse filter and multimatte passes are next to each other. Does it save correctly on your end? ---
**Author:** ![Alex\_M](https://avatars.discourse-cdn.com/v4/letter/a/77aa72/32.png) [@Alex\_M](https://forums.chaos.com/u/Alex_M)\ **Post date:** [August 26, 2020, 12:10pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/5 "2020-08-26T12:10:33Z")
I don’t know, but I often see strange stuff happening with channels in Vray 5. [Here’s an older thread of mine](https://forums.chaosgroup.com/forum/v-ray-for-3ds-max-forums/v-ray-for-3ds-max-problems/1078994-rendered-image-turned-black-red-after-doing-region-render) where again strange stuff happened with MultiMateElement. ---
**Author:** ![hermit.crab](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/hermit.crab/32/46825_2.png) [@hermit.crab](https://forums.chaos.com/u/hermit.crab)\ **Post date:** [August 26, 2020, 12:47pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/6 "2020-08-26T12:47:54Z")
I cannot seem to reproduce it with the described steps. Do tell if you are able to, so we can investigate and try the suggested solution from the other topic. ---
**Author:** ![Alex\_M](https://avatars.discourse-cdn.com/v4/letter/a/77aa72/32.png) [@Alex\_M](https://forums.chaos.com/u/Alex_M)\ **Post date:** [August 26, 2020, 12:58pm UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/7 "2020-08-26T12:58:40Z")
Ok, I’ll try to keep an eye and remember what triggers this. ---
**Author:** ![Pixelcon](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/pixelcon/32/22319_2.png) [@Pixelcon](https://forums.chaos.com/u/Pixelcon)\ **Post date:** [August 29, 2020, 7:43am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/8 "2020-08-29T07:43:23Z")
I just did a region render and everything outside the region in the rgb color channel appeared just like diffusefilter. very strange. ---
**Author:** ![Alex\_M](https://avatars.discourse-cdn.com/v4/letter/a/77aa72/32.png) [@Alex\_M](https://forums.chaos.com/u/Alex_M)\ **Post date:** [August 29, 2020, 11:53am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/9 "2020-08-29T11:53:14Z")
Same here! The problem occurred when I did a region render. Maybe that’s what triggers the bug? ---
**Author:** ![Pixelcon](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/pixelcon/32/22319_2.png) [@Pixelcon](https://forums.chaos.com/u/Pixelcon)\ **Post date:** [August 30, 2020, 8:28am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/10 "2020-08-30T08:28:08Z")
Seems to be something to do with the denoiser. If I have a region going and the denoiser kicks in, it switches the area outside the region to something from a different pass. If I slide the denoiser opacity down, so disappears the mystery pass… ---
**Author:** ![hermit.crab](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/hermit.crab/32/46825_2.png) [@hermit.crab](https://forums.chaos.com/u/hermit.crab)\ **Post date:** [August 31, 2020, 7:51am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/11 "2020-08-31T07:51:23Z")
@Pixelcon I am still unable to reproduce the issue. Could you send your scene to [support@chaosgroup.com](mailto:support@chaosgroup.com) as well? ---
**Author:** ![Pixelcon](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/pixelcon/32/22319_2.png) [@Pixelcon](https://forums.chaos.com/u/Pixelcon)\ **Post date:** [August 31, 2020, 8:06am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/12 "2020-08-31T08:06:22Z")
I’m afraid this scene cannot be shared. But i’ll see if I can strip it down for you. ---
**Author:** ![yavor.rubenov](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/yavor.rubenov/32/2946_2.png) [@yavor.rubenov](https://forums.chaos.com/u/yavor.rubenov)\ **Post date:** [September 10, 2020, 7:30am UTC](https://forums.chaos.com/t/multimatte-element-not-working-as-expected/100134/13 "2020-09-10T07:30:42Z")
For future reference - here I’ve described what could be causing the issue: [Denoised image becomes worse after doing region renderings - Issues - Chaos Forum](https://forums.chaosgroup.com/forum/v-ray-for-3ds-max-forums/v-ray-for-3ds-max-problems/1082937-denoised-image-becomes-worse-after-doing-region-renderings?p=1083469#post1083469) Fix is in the works..