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 |
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 } |
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 |
|
|