erebus
annotate liberebus/src/bvol.cc @ 0:4abdce1361b9
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 27 Apr 2014 16:02:47 +0300 |
| parents | |
| children | 474a0244f57d |
| rev | line source |
|---|---|
| nuclear@0 | 1 #include "bvol.h" |
| nuclear@0 | 2 |
| nuclear@0 | 3 bool AABox::intersect(const Ray &ray) const |
| nuclear@0 | 4 { |
| nuclear@0 | 5 Vector3 param[2] = {vmin, vmax}; |
| nuclear@0 | 6 Vector3 inv_dir(1.0 / ray.dir.x, 1.0 / ray.dir.y, 1.0 / ray.dir.z); |
| nuclear@0 | 7 int sign[3] = {inv_dir.x < 0, inv_dir.y < 0, inv_dir.z < 0}; |
| nuclear@0 | 8 |
| nuclear@0 | 9 float tmin = (param[sign[0]].x - ray.origin.x) * inv_dir.x; |
| nuclear@0 | 10 float tmax = (param[1 - sign[0]].x - ray.origin.x) * inv_dir.x; |
| nuclear@0 | 11 float tymin = (param[sign[1]].y - ray.origin.y) * inv_dir.y; |
| nuclear@0 | 12 float tymax = (param[1 - sign[1]].y - ray.origin.y) * inv_dir.y; |
| nuclear@0 | 13 |
| nuclear@0 | 14 if(tmin > tymax || tymin > tmax) { |
| nuclear@0 | 15 return false; |
| nuclear@0 | 16 } |
| nuclear@0 | 17 if(tymin > tmin) { |
| nuclear@0 | 18 tmin = tymin; |
| nuclear@0 | 19 } |
| nuclear@0 | 20 if(tymax < tmax) { |
| nuclear@0 | 21 tmax = tymax; |
| nuclear@0 | 22 } |
| nuclear@0 | 23 |
| nuclear@0 | 24 float tzmin = (param[sign[2]].z - ray.origin.z) * inv_dir.z; |
| nuclear@0 | 25 float tzmax = (param[1 - sign[2]].z - ray.origin.z) * inv_dir.z; |
| nuclear@0 | 26 |
| nuclear@0 | 27 if(tmin > tzmax || tzmin > tmax) { |
| nuclear@0 | 28 return false; |
| nuclear@0 | 29 } |
| nuclear@0 | 30 if(tzmin > tmin) { |
| nuclear@0 | 31 tmin = tzmin; |
| nuclear@0 | 32 } |
| nuclear@0 | 33 if(tzmax < tmax) { |
| nuclear@0 | 34 tmax = tzmax; |
| nuclear@0 | 35 } |
| nuclear@0 | 36 |
| nuclear@0 | 37 return true; |
| nuclear@0 | 38 } |