Vray dirt radius with texture

[boby]

If you find time to add this little feature.
In Vray (for max), we can set a B&W texture in the radius channel of the Vray Dirt texture.
It helps a lot for randomize the Vraydirt output and use it as mask to place other map (like water mark, age mark etc).

Thanks,

boby

[boby]

Re: Vray dirt radius with texture

Sorry for double post, but i was searching for reference image that show the power of this tips.

http://www.brandsareopinions.com/wp-...01/00doves.png

Here you can see the effect of combining a B&W image (like this : http://slodive.com/wp-content/upload...b-w-grunge.jpg ) with a dirt texture radius channel.

The effect is more visible on the wall, but it's use more or less everywhere on the image (doing a great job combine with the "standart" Uv texturing).

boby

[bdancer]

Re: Vray dirt radius with texture

Haven't you tried to use Dirt as a stencil texture? I think this will do the trick.

[boby]

Re: Vray dirt radius with texture

hum.. not sure i understand..
If you mean :
- use directly Vray Dirt texture as stencil : That's what i want but i need variation in this stencil (texture input in radius do it).
- Use an image texture in "occlude" channel of the Vray Dirt texture : The result is really different (tilling of the texture is really visible by doing that)

boby

[bdancer]

Re: Vray dirt radius with texture

hum.. not sure i understand..

Sry, it was me =) Misses "radius" keyword... Ok, its not a problem to add it.

[bdancer]

Re: Vray dirt radius with texture

Done, you could try it.

[boby]

Re: Vray dirt radius with texture

=D Thanks a lot !!

Just to show you why i was asking for that feature. That's the effect in 2 click



Next i'll use this as mask beetween wall texture and dirt (image) texture = lot of randomness with 4 click ! Amazing.

[jorisAR]

Re: Vray dirt radius with texture

I really like the texturing result.
Is there any chance, you could explain a bit how you did this, I never worked with Vray Dirt texturing.

Thx

[boby]

Re: Vray dirt radius with texture

well, i ll try to make a small todo,

Todo:

- add a Vraydirt texture (Dirt1)
- add an image texture of dirt in B&W (like this one for example : http://www.sharecg.com/images/medium/2832.jpg). Aspect of this texture will affect a lot the result, just test some texture and find the good one
- put this image in the Vray dirt texture radius (you have to update your exporter to get this feature)
- don't forget to desactivate your image texture (set the mapping to Uv and unwrap your model quickly with smart Uv. You can also map it in object mod)
- Voila !

If you wan't advance controle you can :

- add a new Vray dirt texture : Dirt2 (and desactivate the old one)
- set Dirt1 in occlude color of dirt2. It allows you to limite the random scale of the first radius with a manual radius while keeping the randomness of Dirt1
- Modifying B&W balance of the texture works too. It's a bit longer but result is better (cause you keep the hard edges of your B&W texture).

You can simply use the result as a multiply for your wall shader (for example).

For advanced texturing, you can :
- put a colored dirt image texture in the dirst1 's occlude channel
or (better)
- use directly the result of dirt2 as stencil beetween 2 shaders (rust and metal is a really good example for this technique).

Hope you understand.. sorry for my english

boby

[jorisAR]

Re: Vray dirt radius with texture

Thanks for your quick reply, I'll give it a try this week.
Cheers

[voytov]

Re: Vray dirt radius with texture

Hi guys, the effect is great! Hope to achieve similar result today to what Boby presented.

-Andrey, what is the maximum value of radius when it is "texture driven"? Is it scalable? In large scene where I need a radius of 60, after linking white/gray texture I just get thin line - not dirt..

-Boby, could you share the scene with material/texture structure, please? I cannot reproduce the "edgy" effect of the dirt that is formed on the outlines of the box. My dirt is also much more blurry..

[bdancer]

Re: Vray dirt radius with texture

Not sure, need research, may be we could add additional multipliers.

[voytov]

Re: Vray dirt radius with texture

Would be cool..
By now I recommend using maps converted to hdr - the efect of "overexposure" gives multiplied dirt radius in scene.
It 100% solved the problem in my cases..

[boby]

Re: Vray dirt radius with texture

Hi !

Sorry, i'm a bit late
I don't have the blend but you can reproduce it easily with the todo.

In order to control the "radius texture" you have multiple choice. The best is to use a standart dirt as stencil for your "driven dirt".
You can add another texture in the occluded/unoccluded chan of the stencil dirt (the standart) to break the smoothness of the blend.

Hope i'm clear

boby

[mrG_Grm]

Re: Vray dirt radius with texture

Hi

For me it is not work, or I do not understand something. Does it not suppous to work like here

"In the next example a bitmap is used in the texmap radius slot. Notice that the main radius parameter
still has effect - it determines the amout of area where the texmap radius bitmap would blend."

It is from http://www.spot3d.com/vray/help/150S...s_vraydirt.htm example 6.

But when I am seting radius map, it overides radius param.

edit

I made a test render to display what I mean



Middle one something is the geometry without radius map, just dirt (0.1 radius)

left one dirt (0.1 radius) with radius map

and as far as i understand everything should look like on the right one geometry.