[Radiance-general] water simulation

[Ignacio Munárriz]

I'm trying tom model water with the prism1 & prism2 primitives. I`ve been
able to propagate the rays from sources using

     void prism1 white
     5 1 dx dy dz water.cal
     0
     3 1 1 1

     white polygon agua
      0
      0
      12 0 2 1         0 0 1   2 0 1    2 2 1

     void light bright
     0
     0
     3  100  100  100

     bright polygon fixture
     0
     0
     12  1 1  2.5         1 1.2 2.5   1.2 1.2 2.    1.2 1 2.5


 and leaving the water.cal file as
dx=Dx;
dy=Dy;
dz=Dz;

but when i try to rotate de incident ray with on the y axis
dx=(Dx*cos(angle*PI/180))+(Dz*sin(angle*PI/180));
dz=(Dz*cos(angle*PI/180))-(Dx*sin(angle*PI/180));
dy=Dy;

 i get the error
rpict: warning - aiming failure for light source "fixture"