ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/rt/rayinit.cal
(Generate patch)

Comparing ray/src/rt/rayinit.cal (file contents):
Revision 2.4 by greg, Mon Aug 17 16:01:24 1992 UTC vs.
Revision 2.14 by greg, Tue Mar 11 19:29:05 2003 UTC

# Line 1 | Line 1
1 < { SCCSid "$SunId$ LBL" }
2 <
1 > { RCSid $Id$ }
2   {
3          Initialization file for Radiance.
4  
# Line 18 | Line 17
17          Kx, Ky, Kz                      - world k unit vector
18          arg(n)                          - real arguments, arg(0) is count
19  
20 +        For mesh objects, the following are available:
21 +
22 +        Lu, Lv                          - local (u,v) coordinates
23 +
24          For brdf functions, the following are also available:
25  
26          NxP, NyP, NzP                   - perturbed surface normal
27          RdotP                           - perturbed ray dot product
28          CrP, CgP, CbP                   - perturbed material color
29  
30 +        For prism1 and prism2 types, the following are available:
31 +
32 +        DxA, DyA, DzA                   - direction to target light source
33 +
34          Library functions:
35  
36          if(a, b, c)                     - if a positive, return b, else c
# Line 46 | Line 53
53  
54          hermite(p0,p1,r0,r1,t)          - 1-dimensional hermite polynomial
55  
56 <        noise3(x,y,z), noise3a(x,y,z),
57 <        noise3b(x,y,z), noise3c(x,y,z)  - noise function with gradient (-1 to 1)
56 >        noise3(x,y,z), noise3x(x,y,z),
57 >        noise3y(x,y,z), noise3z(x,y,z)  - noise function with gradient (-1 to 1)
58  
59          fnoise3(x,y,z)                  - fractal noise function (-1 to 1)
60   }
# Line 57 | Line 64 | AC = arg(0);
64   A1 = arg(1); A2 = arg(2); A3 = arg(3); A4 = arg(4); A5 = arg(5);
65   A6 = arg(6); A7 = arg(7); A8 = arg(8); A9 = arg(9); A10 = arg(10);
66  
67 + noise3a(x,y,z) : noise3x(x,y,z);
68 + noise3b(x,y,z) : noise3y(x,y,z);
69 + noise3c(x,y,z) : noise3z(x,y,z);
70 +
71                          { Forward compatibility (?) }
72   D(i) = select(i, Dx, Dy, Dz);
73   N(i) = select(i, Nx, Ny, Nz);
74   P(i) = select(i, Px, Py, Pz);
75 < noise3d(i,x,y,z) = select(i, noise3a(x,y,z), noise3b(x,y,z), noise3c(x,y,z));
75 > noise3d(i,x,y,z) : select(i, noise3x(x,y,z), noise3y(x,y,z), noise3z(x,y,z));
76  
77                          { More robust versions of library functions }
78   bound(a,x,b) : if(a-x, a, if(x-b, b, x));
79   Acos(x) : acos(bound(-1,x,1));
80   Asin(x) : asin(bound(-1,x,1));
81 + Atan2(y,x) : if(x*x+y*y, atan2(y,x), 0);
82   Exp(x) : if(-x-100, 0, exp(x));
83   Sqrt(x) : if(x, sqrt(x), 0);
84  
# Line 79 | Line 91 | FTINY : 1e-7;
91   and(a,b) : if( a, b, a );
92   or(a,b) : if( a, a, b );
93   not(a) : if( a, -1, 1 );
94 + xor(a,b) : if( a, not(b), b );
95   abs(x) : if( x, x, -x );
96   sgn(x) : if( x, 1, if(-x, -1, 0) );
97   sq(x) : x*x;
# Line 90 | Line 103 | mod(n,d) : n - floor(n/d)*d;
103   tri(n,d) : abs( d - mod(n-d,2*d) );
104   linterp(t,p0,p1) : (1-t)*p0 + t*p1;
105  
106 < noop(v) = v;
107 < clip(v) = bound(0,v,1);
108 < noneg(v) = if(v,v,0);
109 < red(r,g,b) = if(r,r,0);
110 < green(r,g,b) = if(g,g,0);
111 < blue(r,g,b) = if(b,b,0);
112 < grey(r,g,b) = noneg(.263*r + .655*g + .082*b);
113 < clip_r(r,g,b) = bound(0,r,1);
114 < clip_g(r,g,b) = bound(0,g,1);
115 < clip_b(r,g,b) = bound(0,b,1);
116 < clipgrey(r,g,b) = bound(0,grey(r,g,b),1);
106 > noop(v) : v;
107 > clip(v) : bound(0,v,1);
108 > noneg(v) : if(v,v,0);
109 > red(r,g,b) : if(r,r,0);
110 > green(r,g,b) : if(g,g,0);
111 > blue(r,g,b) : if(b,b,0);
112 > grey(r,g,b) : noneg(.265074126*r + .670114631*g + .064811243*b);
113 > clip_r(r,g,b) : bound(0,r,1);
114 > clip_g(r,g,b) : bound(0,g,1);
115 > clip_b(r,g,b) : bound(0,b,1);
116 > clipgrey(r,g,b) : min(grey(r,g,b),1);
117  
118   dot(v1,v2) : v1(1)*v2(1) + v1(2)*v2(2) + v1(3)*v2(3);
119   cross(i,v1,v2) : select(i,      v1(2)*v2(3) - v1(3)*v2(2),
120                                  v1(3)*v2(1) - v1(1)*v2(3),
121                                  v1(1)*v2(2) - v1(2)*v2(1));
122  
123 < fade(near_val,far_val,dist) = far_val +
123 > fade(near_val,far_val,dist) : far_val +
124                  if (16-dist, (near_val-far_val)/(1+dist*dist), 0);
125  
126 < bezier(p1, p2, p3, p4, t) =     p1 * (1+t*(-3+t*(3-t))) +
126 > bezier(p1, p2, p3, p4, t) :     p1 * (1+t*(-3+t*(3-t))) +
127                                  p2 * 3*t*(1+t*(-2+t)) +
128                                  p3 * 3*t*t*(1-t) +
129                                  p4 * t*t*t ;
130  
131 < bspline(pp, p0, p1, pn, t) =    pp * (1/6+t*(-.5+t*(.5-1/6*t))) +
131 > bspline(pp, p0, p1, pn, t) :    pp * (1/6+t*(-.5+t*(.5-1/6*t))) +
132                                  p0 * (2/3+t*t*(-1+.5*t)) +
133                                  p1 * (1/6+t*(.5+t*(.5-.5*t))) +
134                                  pn * (1/6*t*t*t) ;
135  
136 < turbulence(x,y,z,s) = if( s-1.01, 0, abs(noise3(x/s,y/s,z/s)*s) +
136 > turbulence(x,y,z,s) : if( s-1.01, 0, abs(noise3(x/s,y/s,z/s)*s) +
137                                                  turbulence(x,y,z,2*s) );
138 < turbulencea(x,y,z,s) = if( s-1.01, 0,
139 <                        sgn(noise3(x/s,y/s,z/s))*noise3a(x/s,y/s,z/s) +
140 <                        turbulencea(x,y,z,2*s) );
141 < turbulenceb(x,y,z,s) = if( s-1.01, 0,
142 <                        sgn(noise3(x/s,y/s,z/s))*noise3b(x/s,y/s,z/s) +
143 <                        turbulenceb(x,y,z,2*s) );
144 < turbulencec(x,y,z,s) = if( s-1.01, 0,
145 <                        sgn(noise3(x/s,y/s,z/s))*noise3c(x/s,y/s,z/s) +
146 <                        turbulencec(x,y,z,2*s) );
138 > turbulencex(x,y,z,s) : if( s-1.01, 0,
139 >                        sgn(noise3(x/s,y/s,z/s))*noise3x(x/s,y/s,z/s) +
140 >                        turbulencex(x,y,z,2*s) );
141 > turbulencey(x,y,z,s) : if( s-1.01, 0,
142 >                        sgn(noise3(x/s,y/s,z/s))*noise3y(x/s,y/s,z/s) +
143 >                        turbulencey(x,y,z,2*s) );
144 > turbulencez(x,y,z,s) : if( s-1.01, 0,
145 >                        sgn(noise3(x/s,y/s,z/s))*noise3z(x/s,y/s,z/s) +
146 >                        turbulencez(x,y,z,2*s) );
147  
148                          { Normal distribution from uniform range (0,1) }
149  
150 < un2`private(t) : t - (2.515517+t*(.802853+t*.010328))/
150 > un2`P(t) : t - (2.515517+t*(.802853+t*.010328))/
151                  (1+t*(1.432788+t*(.189269+t*.001308))) ;
152 < un1`private(p) : un2`private(sqrt(-2*log(p))) ;
152 > un1`P(p) : un2`P(sqrt(-2*log(p))) ;
153  
154 < unif2norm(p) : if( .5-p, un1`private(p), -un1`private(1-p) ) ;
154 > unif2norm(p) : if( .5-p, -un1`P(p), un1`P(1-p) ) ;
155  
156   nrand(x) = unif2norm(rand(x));
157  
158                          { Local (u,v) coordinates for planar surfaces }
159 < crosslen`private = Nx*Nx + Ny*Ny;
160 <                        { U is distance from origin in XY-plane }
161 < U = if( crosslen`private - FTINY,
162 <                (Py*Nx - Px*Ny)/crosslen`private,
159 > crosslen`P = Nx*Nx + Ny*Ny;
160 >                        { U is distance from projected Z-axis }
161 > U = if( crosslen`P - FTINY,
162 >                (Py*Nx - Px*Ny)/crosslen`P,
163                  Px);
164                          { V is defined so that N = U x V }
165 < V = if( crosslen`private - FTINY,
166 <                Pz - Nz*(Px*Nx + Py*Ny)/crosslen`private,
165 > V = if( crosslen`P - FTINY,
166 >                Pz - Nz*(Px*Nx + Py*Ny)/crosslen`P,
167                  Py);

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines