# VrayDirt as Bump? **URL:** \ **Category:** General\ **Created:** [February 4, 2020, 11:25am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158 "2020-02-04T11:25:19Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [February 4, 2020, 11:25am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/1 "2020-02-04T11:25:19Z")
VrayDirt as Bump? I’m trying this, looks like not working. I’m using the vray dirt to drive some mix of two materials, and I also want to have different bumps levels between this two materials that correspond with that dirt. I’m trying several ways, but no luck with this. Thankyou. ---
**Author:** ![\_Lele](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/_lele/32/49986_2.png) [@\_Lele](https://forums.chaos.com/u/_Lele)\ **Post date:** [February 4, 2020, 12:00pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/2 "2020-02-04T12:00:51Z")
I think it’s a circular reference: AO would consider bump, and bump would need AO to be computed. Bake the Dirt, and then you’ll be able to use it as mask in the bump slot. ---
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [February 4, 2020, 12:23pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/3 "2020-02-04T12:23:58Z")
Thanks for the reply. well I could use then Curvature for the matter, less fancy but that looks like not working either. There is times where you don’t wanna bake anything, using triplanars for example. Is there a work arround for that? ---
**Author:** ![\_Lele](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/_lele/32/49986_2.png) [@\_Lele](https://forums.chaos.com/u/_Lele)\ **Post date:** [February 4, 2020, 12:25pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/4 "2020-02-04T12:25:09Z")
Same: curvature would consider the bumped normals. ---
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [February 4, 2020, 12:36pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/5 "2020-02-04T12:36:43Z")
I see!, I’ve tested both, true the bump affects the result of the occlusion or curvature. Its a shame because that would be so usefull, like Substance Painter handles that kind of things with the different bump levels for each layer. Could the dirt have a “Not affected by BumpNormals” option so we can useit for masking the bump. or is that something very stupid? Thankyou. ---
**Author:** ![\_Lele](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/_lele/32/49986_2.png) [@\_Lele](https://forums.chaos.com/u/_Lele)\ **Post date:** [February 4, 2020, 12:43pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/6 "2020-02-04T12:43:25Z")
That’s a question for the Devs. 🙂 ---
**Author:** ![savage309](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/savage309/32/40144_2.png) [@savage309](https://forums.chaos.com/u/savage309)\ **Post date:** [February 5, 2020, 12:02am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/7 "2020-02-05T00:02:07Z")
> [@\_Lele](#): > > I think it’s a circular reference: AO would consider bump, and bump would need AO to be computed. > Bake the Dirt, and then you’ll be able to use it as mask in the bump slot. I doubt thats the reason … Best, Blago. ---
**Author:** ![\_Lele](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/_lele/32/49986_2.png) [@\_Lele](https://forums.chaos.com/u/_Lele)\ **Post date:** [February 5, 2020, 11:22am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/8 "2020-02-05T11:22:49Z")
Well, if both are working in the other slots, which don’t modify the shaded normal, that’d be a bit of a coincidence. I have of course no data in hand to know if it is the case in code, and so i may well be very wrong (and not for the first, or last time either.). ---
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [February 5, 2020, 1:19pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/9 "2020-02-05T13:19:28Z")
Actually the Curvature is affected by bump, but not so sure about the Dirt now. Anyways none of them works on the bump channel. Also problems in bump with the OSL maps. This two things are quite big problems, resolving this for me is very important. I would like to know what is the actuall status of this by some developer, lets see If I’m lucky 🙂 ---
**Author:** ![PIXELBOX\_SRO](https://avatars.discourse-cdn.com/v4/letter/p/97f17d/32.png) [@PIXELBOX\_SRO](https://forums.chaos.com/u/PIXELBOX_SRO)\ **Post date:** [February 10, 2020, 3:07am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/10 "2020-02-10T03:07:55Z")
I can confirm it has never worked for me to use dirt or curvature in the bump map slot. Its such a shame. I am sure there must be a good reason why it doesnt otherwise i dont see why its not already supported. ---
**Author:** ![\_Lele](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/_lele/32/49986_2.png) [@\_Lele](https://forums.chaos.com/u/_Lele)\ **Post date:** [February 10, 2020, 10:12am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/11 "2020-02-10T10:12:45Z")
@houourin could you be more specific as to what you’re trying to achieve? It’s a devs’ request, i’m just being the mouthpiece. 🙂 ---
**Author:** ![vladimir.nedev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir.nedev/32/59224_2.png) [@vladimir.nedev](https://forums.chaos.com/u/vladimir.nedev)\ **Post date:** [March 23, 2020, 12:21pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/12 "2020-03-23T12:21:14Z")
Try using 2 **VRayBumpMtls** which are then connected to the **VRayBlendMtl**. Greetings, Vladimir Nedev ---
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [March 24, 2020, 3:34am UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/13 "2020-03-24T03:34:35Z")
@vladimir.nedev Thank you for your advice. Maybe I’m doing something wrong because I dont get the bump kicking in the render. The closest of what I’m after is case 1 from the previous post but without that edge strange effect. uploaded also the file. ![new_bump.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/f/e/fe77bb47bcfdef576e8f58e6c16e5bf15912a5d1.jpeg) [vraybump\_002.zip](https://forums.chaos.com/uploads/short-url/4R8PxfjvmSojStTKXbBUnUt1WmJ.zip) (308 KB) ---
**Author:** ![vladimir.nedev](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/vladimir.nedev/32/59224_2.png) [@vladimir.nedev](https://forums.chaos.com/u/vladimir.nedev)\ **Post date:** [March 24, 2020, 1:11pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/14 "2020-03-24T13:11:37Z")
Oh, sorry, I didn’t realize you want the Dirt texture to create the bump, not only mask it. Greetings, Vladimir Nedev ---
**Author:** ![houourin](https://avatars.discourse-cdn.com/v4/letter/h/f19dbf/32.png) [@houourin](https://forums.chaos.com/u/houourin)\ **Post date:** [April 5, 2020, 3:43pm UTC](https://forums.chaos.com/t/vraydirt-as-bump/97158/15 "2020-04-05T15:43:57Z")
> [@vladimir.nedev](#): > > Oh, sorry, I didn’t realize you want the Dirt texture to create the bump, not only mask it. > > Greetings, > Vladimir Nedev Oh.. so can’t be done? or …? Thank you.