| 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 } |
| 92 |
|
|
| 93 |
|
noop(v) = v; |
| 94 |
|
clip(v) = bound(0,v,1); |
| 95 |
< |
noneg(v) = max(0,v); |
| 96 |
< |
red(r,g,b) = r; |
| 97 |
< |
green(r,g,b) = g; |
| 98 |
< |
blue(r,g,b) = b; |
| 99 |
< |
grey(r,g,b) = .3*r + .59*g + .11*b; |
| 95 |
> |
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) = 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); |
| 103 |
< |
clipgrey(r,g,b) = bound(0,grey(r,g,b),1); |
| 103 |
> |
clipgrey(r,g,b) = min(grey(r,g,b),1); |
| 104 |
|
|
| 105 |
|
dot(v1,v2) : v1(1)*v2(1) + v1(2)*v2(2) + v1(3)*v2(3); |
| 106 |
|
cross(i,v1,v2) : select(i, v1(2)*v2(3) - v1(3)*v2(2), |
| 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) ) ; |
| 141 |
> |
unif2norm(p) : if( .5-p, -un1`private(p), un1`private(1-p) ) ; |
| 142 |
|
|
| 143 |
|
nrand(x) = unif2norm(rand(x)); |
| 144 |
|
|
