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root/radiance/ray/src/rt/rayinit.cal
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Comparing ray/src/rt/rayinit.cal (file contents):
Revision 2.1 by greg, Tue Nov 12 17:10:31 1991 UTC vs.
Revision 2.4 by greg, Mon Aug 17 16:01:24 1992 UTC

# Line 9 | Line 9
9          Nx, Ny, Nz                      - surface normal
10          Px, Py, Pz                      - intersection point
11          T                               - distance from start
12 +        Ts                              - single ray (shadow) distance
13          Rdot                            - ray dot product
14          S                               - world scale
15          Tx, Ty, Tz                      - world origin
# Line 66 | Line 67 | noise3d(i,x,y,z) = select(i, noise3a(x,y,z), noise3b(x
67   bound(a,x,b) : if(a-x, a, if(x-b, b, x));
68   Acos(x) : acos(bound(-1,x,1));
69   Asin(x) : asin(bound(-1,x,1));
70 < Exp(x) : if(-x-60, 0, exp(x));
70 > Exp(x) : if(-x-100, 0, exp(x));
71   Sqrt(x) : if(x, sqrt(x), 0);
72  
73                          { Useful constants }
# Line 95 | Line 96 | noneg(v) = if(v,v,0);
96   red(r,g,b) = if(r,r,0);
97   green(r,g,b) = if(g,g,0);
98   blue(r,g,b) = if(b,b,0);
99 < grey(r,g,b) = .3*r + .59*g + .11*b;
99 > grey(r,g,b) = noneg(.263*r + .655*g + .082*b);
100   clip_r(r,g,b) = bound(0,r,1);
101   clip_g(r,g,b) = bound(0,g,1);
102   clip_b(r,g,b) = bound(0,b,1);
# Line 135 | Line 136 | turbulencec(x,y,z,s) = if( s-1.01, 0,
136  
137   un2`private(t) : t - (2.515517+t*(.802853+t*.010328))/
138                  (1+t*(1.432788+t*(.189269+t*.001308))) ;
139 < un1`private(p) : un2`private(sqrt(log(1/p/p))) ;
139 > un1`private(p) : un2`private(sqrt(-2*log(p))) ;
140  
141   unif2norm(p) : if( .5-p, un1`private(p), -un1`private(1-p) ) ;
142  

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