[Radiance-general] Image mapping

[Carsten Bauer]

Rob Guglielmetti wrote:
> I'm interested in possibly doing a digital mockup of a store window. The 
> window will have a translucent graphic applied to the glass, and will be 


Hi Rob,

you can use the classic mixfunc primitive for this, i.e. you mix your 
mapped image with a 'void' material.

void mixfunc transp_image
4 image void fore func.cal
0
n ..

'fore' gives the foreground coeffcient determined with help of a 
function in the cal file (if e.g you want the transparency to change 
over the surface..). Otherwise set 'fore' to a constant value and a '.' 
(point) for func.cal.

If you apply this mixed material to a trans base, make shure that the 
roughness parameter is zero to have the light really shine through it.

-cb