VrayDirt as Bump?

[houourin]

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.

[^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.

[houourin]

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?

[^Lele^]

Same: curvature would consider the bumped normals.

[houourin]

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.

[^Lele^]

That's a question for the Devs.

[savage309]

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.

[^Lele^]

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.).

[houourin]

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

[PIXELBOX_SRO]

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.

[^Lele^]

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.

[houourin]

^Lele^

I was trying to achieve a difference in bump level after using two materials masked with a vraydirt.
I can Use the Vray dirt to create a mask that shows one material or another but, I can't use it to create a bump difference.

Actually now I performed some tests and I could get something similar to what I spected but not there.. I get some strange Edge lines. :S


Case 1 is maybe the simplest tried to use the OSL with VrayDirt as bump. I could using the color to bump but I get strange edge seams, am I doing something wrong here?
Case 2 maybe its already nuts but anyway, I'm thinking like "substance painter here" kinda one material has white bump the other black bump so I spect that mixing them would give me the same thing.
Case 3 trying even harder to get it nuts and fixing that thing with a VrayBump material using the same trick as the case 1... but again we get that edges.

This sure can be done right?! I'm just not getting it right... surely.

[vladimir.nedev]

Try using 2 VRayBumpMtls which are then connected to the VRayBlendMtl.

Greetings,
Vladimir Nedev

[houourin]

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.

[vladimir.nedev]

Oh, sorry, I didn't realize you want the Dirt texture to create the bump, not only mask it.

Greetings,
Vladimir Nedev