[Radiance-general] BRDF in .cal under illumination maps?

[Katja Doerschner]

(Very sorry for the double posting - I forgot to send from my  
subscribed email account)


Dear Group,

I want to use a parametric BRDF (defined in a .cal file and used in  
conjunction with plasfunc - see below) together with an hdr  
illumination map.

However doing that seems to switch off my BRDF calculation and the  
object looks Lambertian (and not velvety, as it is supposed to).

Does any one have an idea how to solve this problem?

Thanks a lot!

Katja

Here a link to the velvety object under point light source  
illumination.: http://www.bilkent.edu.tr/~katja/velvet.tiff


----------------------------------------------------------

void plasfunc mirror
2 refl surf_lobe.cal
0
9 1 1 1 1 .1 -1 0 0 1
# x y z area param Vx Vy Vz
#(to obtain the view direction)


{code extracted from surf_lobe.cal:}
Vx = -(arg(6) - Px);
Vy = -(arg(7) - Py);
Vz = -(arg(8) - Pz);

{3.4 Surface lobe - equation from Pont & tePas 2006}
refl(x,y,z,area)=(1/PI) * (A5/ ( A5+ (x*Nx+y*Ny+z*Nz)*(Vx*Nx+Vy*Ny 
+Vz*Nz) ))*A9;


Katja Doerschner,
Assistant Professor,
Department of Psychology, IISBF, 344
Bilkent University,
06800 Ankara, Turkey

+90 (312) 290 1153 / 3004
bilkent.edu.tr/~katja
vision.bilkent.edu.tr
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