diff options
| -rw-r--r-- | test_vec.cpp | 13 | ||||
| -rw-r--r-- | vec.h | 33 |
2 files changed, 0 insertions, 46 deletions
diff --git a/test_vec.cpp b/test_vec.cpp index a81ee09..537e556 100644 --- a/test_vec.cpp +++ b/test_vec.cpp @@ -106,19 +106,6 @@ TEST(Vec, Reflect) { ASSERT_EQ(v, n.reflect(u)); } -TEST(Vec, Refract) { - vec3d n{1, 0, 0}, u{-1, 0, -1}, v{-sqrt(14), 0, -sqrt(2)}; - ASSERT_EQ(u.unit_vec(), n.refract<true>(u.unit_vec(), 1).unit_vec()); - ASSERT_EQ(u.unit_vec(), n.refract<false>(u.unit_vec(), 1).unit_vec()); - ASSERT_EQ(v.unit_vec(), n.refract<true>(u.unit_vec(), 0.5).unit_vec()); - ASSERT_EQ(v.unit_vec(), n.refract<false>(u.unit_vec(), 0.5).unit_vec()); -} - -TEST(Vec, Refract_TIR) { - vec3d n{1, 0, 0}, u{-1, 0, -sqrt(3)}, v{1, 0, -sqrt(3)}; - ASSERT_EQ(v.unit_vec(), n.refract<true>(u.unit_vec(), 2)); -} - TEST(Vec, VecParallel) { vec3d a{1, 1, 2}, b{1.1, 1.1, 2.2}, c{0,0,0}, d{1, 2, 1}; ASSERT_TRUE(a.parallel(b)); @@ -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 |