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Refraction is fully there, with magic fresnel!

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Godzil
2020-02-22 01:27:48 +00:00
parent e45dbad59e
commit 51a6bbebb9
9 changed files with 126 additions and 3 deletions
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49
tests/intersect_test.cpp
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@@ -253,4 +253,53 @@ TEST(IntersectTest, The_under_point_is_offset_below_the_surface)
ASSERT_TRUE(double_equal(comps.underHitPoint.z, getEpsilon() / 2));
ASSERT_LT(comps.hitPoint.z, comps.underHitPoint.z);
}
TEST(IntersectTest, The_Schlick_approximation_under_total_internal_reflection)
{
GlassSphere shape = GlassSphere();
Ray r = Ray(Point(0, 0, sqrt(2)/2), Vector(0, 1, 0));
Intersect xs = Intersect();
xs.add(Intersection(-sqrt(2)/2, &shape));
xs.add(Intersection(sqrt(2)/2, &shape));
Computation comps = xs[1].prepareComputation(r, &xs);
double reflectance = comps.schlick();
ASSERT_EQ(reflectance, 1.0);
}
TEST(IntersectTest, The_Schlick_approximation_with_a_perpendicular_viewing_angle)
{
GlassSphere shape = GlassSphere();
Ray r = Ray(Point(0, 0, 0), Vector(0, 1, 0));
Intersect xs = Intersect();
xs.add(Intersection(-1, &shape));
xs.add(Intersection(1, &shape));
Computation comps = xs[1].prepareComputation(r, &xs);
double reflectance = comps.schlick();
ASSERT_TRUE(double_equal(reflectance, 0.04));
}
TEST(IntersectTest, The_Schlick_approximation_with_small_angle_and_n2_gt_n1)
{
GlassSphere shape = GlassSphere();
Ray r = Ray(Point(0, 0.99, -2), Vector(0, 0, 1));
Intersect xs = Intersect();
xs.add(Intersection(1.8589, &shape));
Computation comps = xs[0].prepareComputation(r, &xs);
double reflectance = comps.schlick();
/* Temporary lower the precision */
set_equal_precision(0.00001);
ASSERT_TRUE(double_equal(reflectance, 0.48873));
set_equal_precision(FLT_EPSILON);
}