| 6 |
|
ax = arg(AC-4); { ax is roughness in Up orientation } |
| 7 |
|
ay = arg(AC-3); |
| 8 |
|
|
| 9 |
– |
Up(i) = arg(AC-3+i); { up vector does not need to be normalized } |
| 10 |
– |
Vux = cross(1,Up,N); |
| 11 |
– |
Vuy = cross(2,Up,N); |
| 12 |
– |
Vuz = cross(3,Up,N); |
| 13 |
– |
vnorm = 1/sqrt(Vux*Vux + Vuy*Vuy + Vuz*Vuz); |
| 14 |
– |
Vnx = Vux*vnorm; |
| 15 |
– |
Vny = Vuy*vnorm; |
| 16 |
– |
Vnz = Vuz*vnorm; |
| 17 |
– |
Vn(i) = select(i, Vnx, Vny, Vnz); |
| 18 |
– |
Unx = cross(1,N,Vn); |
| 19 |
– |
Uny = cross(2,N,Vn); |
| 20 |
– |
Unz = cross(3,N,Vn); |
| 21 |
– |
{ Transform vectors, normalized (dx,dy,dz) away from surf } |
| 22 |
– |
surf_dx(dx,dy,dz) = dx*Unx + dy*Uny + dz*Unz; |
| 23 |
– |
surf_dy(dx,dy,dz) = dx*Vnx + dy*Vny + dz*Vnz; |
| 24 |
– |
surf_dz(dx,dy,dz) = dx*Nx + dy*Ny + dz*Nz; |
| 25 |
– |
|
| 26 |
– |
inc_dx = surf_dx(-Dx,-Dy,-Dz); |
| 27 |
– |
inc_dy = surf_dy(-Dx,-Dy,-Dz); |
| 28 |
– |
inc_dz = Rdot; |
| 29 |
– |
|
| 9 |
|
arefl(hx,hy,hz) = exp(-(hx*hx/(ax*ax) + hy*hy/(ay*ay))/(hz*hz)) * |
| 10 |
|
(hx*hx + hy*hy + hz*hz) / |
| 11 |
|
(PI*ax*ay*hz*hz*hz*hz); |
| 13 |
|
axmit(hx,hy,hz) = exp(-(hx*hx/(ax*ax) + hy*hy/(ay*ay))/(hz*hz)) / |
| 14 |
|
(4*PI*ax*ay); |
| 15 |
|
|
| 16 |
< |
dobsdf(sdx,sdy,sdz) = if(sdz, arefl(inc_dx+sdx, inc_dy+sdy, inc_dz+sdz), |
| 17 |
< |
axmit(inc_dx+sdx, inc_dy+sdy, inc_dz-sdz) / sqrt(-sdz*inc_dz) ); |
| 16 |
> |
dobsdf(sdx,sdy,sdz) = if(sdz, arefl(Idx+sdx, Idy+sdy, Idz+sdz), |
| 17 |
> |
axmit(Idx+sdx, Idy+sdy, Idz-sdz) / sqrt(-sdz*Idz) ); |
| 18 |
|
|
| 19 |
< |
absdf(ox,oy,oz) = dobsdf(surf_dx(ox,oy,oz), surf_dy(ox,oy,oz), surf_dz(ox,oy,oz)); |
| 19 |
> |
absdf(ox,oy,oz) = dobsdf(Ldx(ox,oy,oz), Ldy(ox,oy,oz), Ldz(ox,oy,oz)); |
