Assigning BSDFs in VEX Shading

[JonathanGranskg]

Hey,

 

Quick question, how do you assign a bsdf to a shader when writing one? I know there's an F output, but I still feel a bit confused about it. Does anyone have any basic example? I couldn't find anything by googling.

 

Let's say I want to assign a diffuse BSDF to a shader that's supposed to be some color.

 

Do I output it like this?

 

Cf = color;

F = bsdf diffuse();

 

Or should I multiply the bsdf by the color to see the color?

 

F = bsdf diffuse() * color;

 

Cheers,

Jonathan

Edited December 20, 2013 by JonathanGranskg

[JonathanGranskg]

Never mind. Found this in the help docs right after posting, not exactly where I expected to find it.

 

// Multiply the diffuse (hemispherical) BSDF by the texture color,
// multiply a phong BSDF by 0.5, and then add the two BSDFs together
F = texture(map) * diffuse() + 0.5 * phong(20);
// Red diffuse surface
F = diffuse() * {1.0, , }

 

So it should be like the second one.

Edited December 20, 2013 by JonathanGranskg

[danylyon]

And then there's albedo().

Never fully understood it, but I think it returns the overall amount a BSDF reflects. Which you can use to normalize / make a BSDF energy conserving.

 

So if You do

F = phong(Exponent);

albedo = albedo(F);

F *= 1/albedo;

 

Now, no mather what Exponent you're using, the shader will be energy conserving.