How do you create a expression for driving outGlowColor (surfaceShader)

[fransbaud]

I'm trying to create a expression that will drive the outGlowColor of the surface shader (named=W) through
using a slider (w_Crv.ty= range 0 to 1)

This is what I came up with, (the expression editor accepted the expression) but it's not working:

float $Rch= w_Crv.ty*0.823529;

float $Gch= w_Crv.ty*0.290196;

float $Bch= w_Crv.ty*0.0431373;

(This turns the glow from black to orange == ty 0 to 1)

setAttr "W.outGlowColor" -type double3 $Rch $Gch $Bch; 

Does anybody have a idee what it's wrong .

[joojaa]

you shouldnt use mel like this in expressions. Use:

W.outGlowColorR = w_Crv.ty*0.823529;
W.outGlowColorG = w_Crv.ty*0.290196;
W.outGlowColorB = w_Crv.ty*0.0431373;

Tough really it would be easier to just connect the ty the u cord of a ramp node withoit expressions, as it would be infinitely more easy to modify for artists.

[fransbaud]

Thnx Joojaa, I will also try to make it as you say with the ramp node. It's always good to learn new ways of solving problems.