diff options
Diffstat (limited to 'vec.h')
| -rw-r--r-- | vec.h | 33 |
1 files changed, 0 insertions, 33 deletions
@@ -10,7 +10,6 @@ #include <ostream> #include <cassert> #include <algorithm> -#include "tracelog.h" static inline bool eq(int a, int b) { return a == b; @@ -123,38 +122,6 @@ struct vec3 { assert(fabs(mod2() - 1.0) < 1e-8); return v - (2.0 * dot(v)) * (*this); } - - // Get the refracted vector. Current vector is the normal vector (length should be 1), - // r1 is the incoming vector, ri_inv is the relative refraction index n2/n1, - // where n2 is the destination media's refraction index, and n1 is the source media's refraction index. - // TIR (Total Internal Reflection) is optionally enabled by macro TIR_OR and TIR_OFF. - // If TIR happens, the ray will be reflected. - template<bool Enable_TIR> - vec3 refract(const vec3 &r1, double ri_inv) const { - assert(fabs(mod2() - 1.0) < 1e-7); - assert(fabs(r1.mod2() - 1.0) < 1e-7); - assert(ri_inv > 0); - assert(dot(r1) < 0); // normal vector must be on the same side - const auto &n = *this; // normal vector - const auto m_cos1 = std::max(dot(r1), (T) (-1)); // cos(a1), a1 is the incoming angle -// assert(m_cos1 <= 0); // incoming angle must smaller than 90deg - const auto c = ri_inv; // c = nx * r`x + ny * r`y - auto d = 1 - c * c * (1 - m_cos1 * m_cos1); - if (d < 0) { - // TODO test TIR - if (Enable_TIR) { - // ri_inv < sin(a1), cannot refract, must reflect (Total Internal Reflection) - TRACELOG(" reflect (TIR, d=%f)\n", d); - return reflect(r1); - } else { - TRACELOG(" refract (forced, d=%f)\n", d); - d = -d; // abs, just make the sqrt has a real solution - } - } - const auto n2 = (r1 - dot(r1) * n) * c - sqrt(d) * n; - assert(n2.valid()); - return n2; - } }; // print to ostream |