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Comparing ray/src/rt/rayinit.cal (file contents):
Revision 1.3 by greg, Wed Oct 9 11:36:45 1991 UTC vs.
Revision 2.17 by greg, Thu Jan 18 19:43:43 2018 UTC

# Line 1 | Line 1
1 < { SCCSid "$SunId$ LBL" }
2 <
1 > { RCSid $Id$ }
2   {
3          Initialization file for Radiance.
4  
# Line 9 | Line 8
8          Nx, Ny, Nz                      - surface normal
9          Px, Py, Pz                      - intersection point
10          T                               - distance from start
11 +        Ts                              - single ray (shadow) distance
12          Rdot                            - ray dot product
13          S                               - world scale
14          Tx, Ty, Tz                      - world origin
# Line 17 | Line 17
17          Kx, Ky, Kz                      - world k unit vector
18          arg(n)                          - real arguments, arg(0) is count
19  
20 <        For brdf functions, the following are also available:
20 >        For mesh objects, the following are available:
21  
22 +        Lu, Lv                          - local (u,v) coordinates
23 +
24 +        For *func & *data materials, 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 33 | Line 41
41  
42          sin(x), cos(x), tan(x),
43          asin(x), acos(x),
44 <        atan(x), atan2(y,x)             - standard trig functions
44 >        atan(x), atan2(y,x)             - standard trig functions (radians)
45  
46          floor(x), ceil(x)               - g.l.b. & l.u.b.
47  
# Line 43 | Line 51
51  
52          rand(x)                         - pseudo-random function (0 to 1)
53  
54 <        hermite(p0,p1,r0,r1,t)          - 1-dimensional hermite polynomial
54 >        noise3(x,y,z), noise3x(x,y,z),
55 >        noise3y(x,y,z), noise3z(x,y,z)  - noise function with gradient (-1 to 1)
56  
48 –        noise3(x,y,z), noise3a(x,y,z),
49 –        noise3b(x,y,z), noise3c(x,y,z)  - noise function with gradient (-1 to 1)
50 –
57          fnoise3(x,y,z)                  - fractal noise function (-1 to 1)
58   }
59  
# Line 56 | Line 62 | AC = arg(0);
62   A1 = arg(1); A2 = arg(2); A3 = arg(3); A4 = arg(4); A5 = arg(5);
63   A6 = arg(6); A7 = arg(7); A8 = arg(8); A9 = arg(9); A10 = arg(10);
64  
65 + noise3a(x,y,z) : noise3x(x,y,z);
66 + noise3b(x,y,z) : noise3y(x,y,z);
67 + noise3c(x,y,z) : noise3z(x,y,z);
68 +
69                          { Forward compatibility (?) }
70   D(i) = select(i, Dx, Dy, Dz);
71   N(i) = select(i, Nx, Ny, Nz);
72   P(i) = select(i, Px, Py, Pz);
73 < noise3d(i,x,y,z) = select(i, noise3a(x,y,z), noise3b(x,y,z), noise3c(x,y,z));
73 > noise3d(i,x,y,z) : select(i, noise3x(x,y,z), noise3y(x,y,z), noise3z(x,y,z));
74  
75                          { More robust versions of library functions }
76   bound(a,x,b) : if(a-x, a, if(x-b, b, x));
77   Acos(x) : acos(bound(-1,x,1));
78   Asin(x) : asin(bound(-1,x,1));
79 < Exp(x) : if(-x-60, 0, exp(x));
79 > Atan2(y,x) : if(x*x+y*y, atan2(y,x), 0);
80 > Exp(x) : if(-x-100, 0, exp(x));
81   Sqrt(x) : if(x, sqrt(x), 0);
82  
83                          { Useful constants }
# Line 78 | Line 89 | FTINY : 1e-7;
89   and(a,b) : if( a, b, a );
90   or(a,b) : if( a, a, b );
91   not(a) : if( a, -1, 1 );
92 + xor(a,b) : if( a, not(b), b );
93   abs(x) : if( x, x, -x );
94   sgn(x) : if( x, 1, if(-x, -1, 0) );
95   sq(x) : x*x;
# Line 89 | Line 101 | mod(n,d) : n - floor(n/d)*d;
101   tri(n,d) : abs( d - mod(n-d,2*d) );
102   linterp(t,p0,p1) : (1-t)*p0 + t*p1;
103  
104 < noop(v) = v;
105 < clip(v) = bound(0,v,1);
106 < noneg(v) = max(0,v);
107 < red(r,g,b) = r;
108 < green(r,g,b) = g;
109 < blue(r,g,b) = b;
110 < grey(r,g,b) = .3*r + .59*g + .11*b;
111 < clip_r(r,g,b) = bound(0,r,1);
112 < clip_g(r,g,b) = bound(0,g,1);
113 < clip_b(r,g,b) = bound(0,b,1);
114 < clipgrey(r,g,b) = bound(0,grey(r,g,b),1);
104 > noop(v) : v;
105 > clip(v) : bound(0,v,1);
106 > noneg(v) : if(v,v,0);
107 > red(r,g,b) : if(r,r,0);
108 > green(r,g,b) : if(g,g,0);
109 > blue(r,g,b) : if(b,b,0);
110 > grey(r,g,b) : noneg(.265074126*r + .670114631*g + .064811243*b);
111 > clip_r(r,g,b) : bound(0,r,1);
112 > clip_g(r,g,b) : bound(0,g,1);
113 > clip_b(r,g,b) : bound(0,b,1);
114 > clipgrey(r,g,b) : min(grey(r,g,b),1);
115  
116   dot(v1,v2) : v1(1)*v2(1) + v1(2)*v2(2) + v1(3)*v2(3);
117   cross(i,v1,v2) : select(i,      v1(2)*v2(3) - v1(3)*v2(2),
118                                  v1(3)*v2(1) - v1(1)*v2(3),
119                                  v1(1)*v2(2) - v1(2)*v2(1));
120  
121 < fade(near_val,far_val,dist) = far_val +
121 > fade(near_val,far_val,dist) : far_val +
122                  if (16-dist, (near_val-far_val)/(1+dist*dist), 0);
123  
124 < bezier(p1, p2, p3, p4, t) =     p1 * (1+t*(-3+t*(3-t))) +
124 > hermite(p0,p1,r0,r1,t) :        p0 * ((2*t-3)*t*t+1) +
125 >                                p1 * (-2*t+3)*t*t +
126 >                                r0 * (((t-2)*t+1)*t) +
127 >                                r1 * ((t-1)*t*t);
128 >
129 > bezier(p1, p2, p3, p4, t) :     p1 * (1+t*(-3+t*(3-t))) +
130                                  p2 * 3*t*(1+t*(-2+t)) +
131                                  p3 * 3*t*t*(1-t) +
132                                  p4 * t*t*t ;
133  
134 < bspline(pp, p0, p1, pn, t) =    pp * (1/6+t*(-.5+t*(.5-1/6*t))) +
134 > bspline(pp, p0, p1, pn, t) :    pp * (1/6+t*(-.5+t*(.5-1/6*t))) +
135                                  p0 * (2/3+t*t*(-1+.5*t)) +
136                                  p1 * (1/6+t*(.5+t*(.5-.5*t))) +
137                                  pn * (1/6*t*t*t) ;
138  
139 < turbulence(x,y,z,s) = if( s-1.01, 0, abs(noise3(x/s,y/s,z/s)*s) +
139 > turbulence(x,y,z,s) : if( s-1.01, 0, abs(noise3(x/s,y/s,z/s)*s) +
140                                                  turbulence(x,y,z,2*s) );
141 < turbulencea(x,y,z,s) = if( s-1.01, 0,
142 <                        sgn(noise3(x/s,y/s,z/s))*noise3a(x/s,y/s,z/s) +
143 <                        turbulencea(x,y,z,2*s) );
144 < turbulenceb(x,y,z,s) = if( s-1.01, 0,
145 <                        sgn(noise3(x/s,y/s,z/s))*noise3b(x/s,y/s,z/s) +
146 <                        turbulenceb(x,y,z,2*s) );
147 < turbulencec(x,y,z,s) = if( s-1.01, 0,
148 <                        sgn(noise3(x/s,y/s,z/s))*noise3c(x/s,y/s,z/s) +
149 <                        turbulencec(x,y,z,2*s) );
141 > turbulencex(x,y,z,s) : if( s-1.01, 0,
142 >                        sgn(noise3(x/s,y/s,z/s))*noise3x(x/s,y/s,z/s) +
143 >                        turbulencex(x,y,z,2*s) );
144 > turbulencey(x,y,z,s) : if( s-1.01, 0,
145 >                        sgn(noise3(x/s,y/s,z/s))*noise3y(x/s,y/s,z/s) +
146 >                        turbulencey(x,y,z,2*s) );
147 > turbulencez(x,y,z,s) : if( s-1.01, 0,
148 >                        sgn(noise3(x/s,y/s,z/s))*noise3z(x/s,y/s,z/s) +
149 >                        turbulencez(x,y,z,2*s) );
150  
151                          { Normal distribution from uniform range (0,1) }
152  
153 < un2`private(t) : t - (2.515517+t*(.802853+t*.010328))/
153 > un2`P.(t) : t - (2.515517+t*(.802853+t*.010328))/
154                  (1+t*(1.432788+t*(.189269+t*.001308))) ;
155 < un1`private(p) : un2`private(sqrt(log(1/p/p))) ;
155 > un1`P.(p) : un2`P.(sqrt(-2*log(p))) ;
156  
157 < unif2norm(p) : if( .5-p, un1`private(p), -un1`private(1-p) ) ;
157 > unif2norm(p) : if( .5-p, -un1`P.(p), un1`P.(1-p) ) ;
158  
159   nrand(x) = unif2norm(rand(x));
160  
161                          { Local (u,v) coordinates for planar surfaces }
162 < crosslen`private = Nx*Nx + Ny*Ny;
163 <                        { U is distance from origin in XY-plane }
164 < U = if( crosslen`private - FTINY,
165 <                (Py*Nx - Px*Ny)/crosslen`private,
162 > crosslen`P. = Nx*Nx + Ny*Ny;
163 >                        { U is distance from projected Z-axis }
164 > U = if( crosslen`P. - FTINY,
165 >                (Py*Nx - Px*Ny)/crosslen`P.,
166                  Px);
167                          { V is defined so that N = U x V }
168 < V = if( crosslen`private - FTINY,
169 <                Pz - Nz*(Px*Nx + Py*Ny)/crosslen`private,
168 > V = if( crosslen`P. - FTINY,
169 >                Pz - Nz*(Px*Nx + Py*Ny)/crosslen`P.,
170                  Py);

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