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Comparing ray/src/rt/rayinit.cal (file contents):
Revision 2.6 by greg, Thu Mar 18 12:36:03 1993 UTC vs.
Revision 2.9 by greg, Fri Aug 25 11:43:29 1995 UTC

# Line 24 | Line 24
24          RdotP                           - perturbed ray dot product
25          CrP, CgP, CbP                   - perturbed material color
26  
27 +        For prism1 and prism2 types, the following are available:
28 +
29 +        DxA, DyA, DzA                   - direction to target light source
30 +
31          Library functions:
32  
33          if(a, b, c)                     - if a positive, return b, else c
# Line 67 | Line 71 | noise3d(i,x,y,z) = select(i, noise3a(x,y,z), noise3b(x
71   bound(a,x,b) : if(a-x, a, if(x-b, b, x));
72   Acos(x) : acos(bound(-1,x,1));
73   Asin(x) : asin(bound(-1,x,1));
74 + Atan2(y,x) : if(x*x+y*y, atan2(y,x), 0);
75   Exp(x) : if(-x-100, 0, exp(x));
76   Sqrt(x) : if(x, sqrt(x), 0);
77  
# Line 144 | Line 149 | nrand(x) = unif2norm(rand(x));
149  
150                          { Local (u,v) coordinates for planar surfaces }
151   crosslen`private = Nx*Nx + Ny*Ny;
152 <                        { U is distance from origin in XY-plane }
152 >                        { U is distance from projected Z-axis }
153   U = if( crosslen`private - FTINY,
154                  (Py*Nx - Px*Ny)/crosslen`private,
155                  Px);

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