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root/radiance/ray/src/rt/rayinit.cal
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Comparing ray/src/rt/rayinit.cal (file contents):
Revision 1.1 by greg, Thu Aug 22 08:57:19 1991 UTC vs.
Revision 1.2 by greg, Tue Sep 3 12:28:05 1991 UTC

# Line 3 | Line 3
3   {
4          Initialization file for Radiance.
5  
6 –        4/14/86
7 – }
8 –
9 – {
6          The following are predefined:
7  
8          Dx, Dy, Dz                      - ray direction
# Line 134 | Line 130 | turbulenceb(x,y,z,s) = if( s-1.01, 0,
130   turbulencec(x,y,z,s) = if( s-1.01, 0,
131                          sgn(noise3(x/s,y/s,z/s))*noise3c(x/s,y/s,z/s) +
132                          turbulencec(x,y,z,2*s) );
133 +
134 +                        { Local (u,v) coordinates for planar surfaces }
135 + crosslen`private = Nx*Nx + Ny*Ny;
136 +                        { U is distance from origin in XY-plane }
137 + U = if( crosslen`private - FTINY,
138 +                (Py*Nx - Px*Ny)/crosslen`private,
139 +                Px);
140 +                        { V is defined so that N = U x V }
141 + V = if( crosslen`private - FTINY,
142 +                Pz - Nz*(Px*Nx + Py*Ny)/crosslen`private,
143 +                Py);

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