dungeon_crawler
annotate prototype/vmath/ray.cc @ 80:a373b36ffc17
better
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 27 Oct 2012 01:59:39 +0300 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@1 | 1 #include "ray.h" |
| nuclear@1 | 2 #include "vector.h" |
| nuclear@1 | 3 |
| nuclear@1 | 4 scalar_t Ray::env_ior = 1.0; |
| nuclear@1 | 5 |
| nuclear@1 | 6 Ray::Ray() { |
| nuclear@1 | 7 ior = env_ior; |
| nuclear@1 | 8 energy = 1.0; |
| nuclear@1 | 9 time = 0; |
| nuclear@1 | 10 iter = 0; |
| nuclear@1 | 11 } |
| nuclear@1 | 12 |
| nuclear@1 | 13 Ray::Ray(const Vector3 &origin, const Vector3 &dir) { |
| nuclear@1 | 14 this->origin = origin; |
| nuclear@1 | 15 this->dir = dir; |
| nuclear@1 | 16 ior = env_ior; |
| nuclear@1 | 17 energy = 1.0; |
| nuclear@1 | 18 time = 0; |
| nuclear@1 | 19 iter = 0; |
| nuclear@1 | 20 } |
| nuclear@1 | 21 |
| nuclear@1 | 22 void Ray::transform(const Matrix4x4 &xform) { |
| nuclear@1 | 23 Matrix4x4 upper; |
| nuclear@1 | 24 Vector3 dir; |
| nuclear@1 | 25 |
| nuclear@1 | 26 upper = xform; |
| nuclear@1 | 27 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0; |
| nuclear@1 | 28 upper[3][3] = 1.0; |
| nuclear@1 | 29 |
| nuclear@1 | 30 dir = (this->dir - origin).transformed(upper); |
| nuclear@1 | 31 origin.transform(xform); |
| nuclear@1 | 32 this->dir = dir + origin; |
| nuclear@1 | 33 } |
| nuclear@1 | 34 |
| nuclear@1 | 35 Ray Ray::transformed(const Matrix4x4 &xform) const { |
| nuclear@1 | 36 Ray foo = *this; |
| nuclear@1 | 37 foo.transform(xform); |
| nuclear@1 | 38 return foo; |
| nuclear@1 | 39 } |
| nuclear@1 | 40 |
| nuclear@1 | 41 void Ray::enter(scalar_t new_ior) { |
| nuclear@1 | 42 ior = new_ior; |
| nuclear@1 | 43 ior_stack.push(ior); |
| nuclear@1 | 44 } |
| nuclear@1 | 45 |
| nuclear@1 | 46 void Ray::leave() { |
| nuclear@1 | 47 if(ior_stack.empty()) { |
| nuclear@1 | 48 //std::cerr << "empty ior stack?\n"; |
| nuclear@1 | 49 return; |
| nuclear@1 | 50 } |
| nuclear@1 | 51 ior_stack.pop(); |
| nuclear@1 | 52 ior = ior_stack.empty() ? env_ior : ior_stack.top(); |
| nuclear@1 | 53 } |
| nuclear@1 | 54 |
| nuclear@1 | 55 scalar_t Ray::calc_ior(bool entering, scalar_t mat_ior) const |
| nuclear@1 | 56 { |
| nuclear@1 | 57 scalar_t from_ior = this->ior; |
| nuclear@1 | 58 |
| nuclear@1 | 59 if(entering) { |
| nuclear@1 | 60 return from_ior / mat_ior; |
| nuclear@1 | 61 } |
| nuclear@1 | 62 |
| nuclear@1 | 63 Ray tmp = *this; |
| nuclear@1 | 64 tmp.leave(); |
| nuclear@1 | 65 return from_ior / tmp.ior; |
| nuclear@1 | 66 } |