Diffuse(nf)

[mark]

hi all,

im trying to convert the basic renderman shader here using VEX builder:

surface myshader(
                float Ka = 1;
                float Kd = 1;
                )
{
    /* Initialize variables */
    normal Nf = faceforward(normalize(N),I);

    /* output */
    Oi = Os;
    Ci = Oi * Cs * (ambient() * Ka + [b]diffuse(Nf)[/b] * Kd);
}

i can get the Nf, but there is no diffuse() VOP - so my diffuse colour is the normal map.

any ideas?

Edited July 17, 2007 by mark

[Nico D.]

You can use the ligthing model with 0 specular and 0 ambient.

Or use the "inline vop" and create your own diffuse node with the diffuse() vex function.

[HyFrmn]

Another alternative is to use an illuminance VOP, and create you own custom diffuse (or any lighting model) VOP. When it's finished you can save it as an OTL, and use the VOP over again for custom shaders. I just finished this my self, so if you need any help, or would like me to post an example, let me know.

~MP

[mark]

thats great, thanks guys. i will have another attempt!

[dee900]

Another alternative is to use an illuminance VOP, and create you own custom diffuse (or any lighting model) VOP. When it's finished you can save it as an OTL, and use the VOP over again for custom shaders. I just finished this my self, so if you need any help, or would like me to post an example, let me know.

Hi HyFrmn, if it isn't too much trouble, I'd greatly appreciate seeing an example ...

[HyFrmn]

I've attached an H8 and H9 version. It includes both a diffuse example as well as a phong example. I'm going to create a tutorial on how to build the shader. Hope this helps.

~MP

illuminance_loop_H8.hip

illuminance_loop_H9.hipnc