Converting a good Velvet renderman shader for using with Mantra

[Farsheed Ashouri]

My question is simple, but kind of confusing for me. I use a Renderman shader withs PRman and it's perfect for me. now that I switched to Houdini with Mantra, I really need the exact shader to use in my productions.

1- How can I convert it to an otl file?

2- Is it possible to convert .sl source file to .vfl?

3- what is the difference between rsl and vex? are they similar?

4- Where can I write vex code directly and render it with Mantra?

Thank you in advanced!

FA_velvet.sl

fa_velvet_renderman_shader.tar.gz

[Guest mantragora]

1- How can I convert it to an otl file?

You can convert it to otl but you will still get renderman shader. It will not work with mantra.

http://www.gravatoni...ri_hrman_03.htm

2- Is it possible to convert .sl source file to .vfl?

Sure, just rewrite it.

I'm not a shader guy and I always forget about - "vector to light"/"eye vector" - which is which in Vex . Anyway, try attached file. Never seen Rman velvet shader on my eyes so I'm not sure is it working correctly. For now it works only with micropolygon engine.

velvetTest.hip

3- what is the difference between rsl and vex? are they similar?

Yes . http://www.sidefx.co...e/transitioning

4- Where can I write vex code directly and render it with Mantra?

http://www.sidefx.co...odes/vop/inline

http://www.sidefx.co...des/vop/snippet

or select/create New Operator Type from File menu and pick "Surface Shader Operator" and "Vex Type". Then you can write your code in it instead of using VOPs.

PS. is it complete shader code ? "Ks" is not used at all there and output color is not multiplied by specular so it doesn't affect output at all. Below renders are after adding "Ks * specular" multiplication.

Edited April 25, 2013 by mantragora

[Farsheed Ashouri]

WoOw... Thank you for complete answer. And thanks for the hip. I learned alot.

The shader is complete for my goal of-course