How to make flake in Mantra

[r1ver]

In Renderman or VRay shader, there is flake parameters. How to make equivalent flake in Mantra, like this http://renderman.pixar.com/view/TGT_Car#Car%20Paint?

 

Thanks!

[stu]

You could try this:

 

http://www.orbolt.com/asset/_danylyon::PBR_layered_material

[r1ver]

It's a nice product uber shader, but, it's a black box.

 

I want to know how to make flake in VOP

[jkunz07]

Maybe something like thisflake.hip

[swapnil.andraskar]

want to kno about sea shader

[eetu]

Wenzel Jacob put his Siggraph 2014 papers online - a very good theoretical basis for doing this properly.

http://www.cs.cornell.edu/projects/stochastic-sg14/

 

Now there is only this small detail of implementing it..

[danylyon]

Hi

 

I made the "black box" shader. ;-)

(Altough I don't think it's a black box, it's written in VEX which is easier to read than a VOP network in my opinion)..

 

I actually started setting the flakes up in a VOP network. I'm attaching it here.

 

It's an "artistic" approach, I guess the paper above might give better result.

flakes.hip

[stevegh]

Beautiful! The voronoi noise is how I went about it also.