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Refraction is fully there, with magic fresnel!

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This commit is contained in:
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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4
tests/ch11_refraction.cpp
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@@ -37,6 +37,7 @@ int main()
Sphere glassBall = Sphere();
glassBall.material.shininess = 300;
glassBall.material.transparency = 1;
glassBall.material.reflective = 1;
glassBall.material.refractiveIndex = 1.52;
glassBall.material.diffuse = 0.1;
w.addObject(&glassBall);
@@ -45,6 +46,7 @@ int main()
airBall.setTransform(scaling(0.5, 0.5, 0.5));
airBall.material.shininess = 300;
airBall.material.transparency = 1;
airBall.material.reflective = 1;
airBall.material.refractiveIndex = 1.0009;
airBall.material.diffuse = 0.1;
w.addObject(&airBall);
@@ -54,7 +56,7 @@ int main()
w.addLight(&light);
/* Set the camera */
Camera camera = Camera(1000, 1000, M_PI / 3);
Camera camera = Camera(100, 100, M_PI / 3);
camera.setTransform(viewTransform(Point(0, 2.5, 0),
Point(0, 0, 0),

2
tests/ch11_test.cpp
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@@ -145,7 +145,7 @@ int main()
w.addLight(&light);
/* Set the camera */
Camera camera = Camera(800, 400, 1.152);
Camera camera = Camera(400, 100, 1.152);
camera.setTransform(viewTransform(Point(-2.6, 1.5, -3.9),
Point(-0.6, 1, -0.8),
Vector(0, 1, 0)));

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);
}

34
tests/world_test.cpp
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@@ -391,5 +391,39 @@ TEST(WorldTest, Shade_hit_with_a_transparent_material)
ASSERT_EQ(c, Colour(0.93642, 0.68642, 0.68642));
set_equal_precision(FLT_EPSILON);
}
TEST(WorldTest, Shade_hit_with_a_reflective_transparent_material)
{
World w = DefaultWorld();
Ray r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2)/2, sqrt(2)/2));
Plane floor = Plane();
floor.setTransform(translation(0, -1, 0));
floor.material.transparency = 0.5;
floor.material.reflective = 0.5;
floor.material.refractiveIndex = 1.5;
w.addObject(&floor);
Sphere ball = Sphere();
ball.material.colour = Colour(1, 0, 0);
ball.material.ambient = 0.5;
ball.setTransform(translation(0, -3.5, -0.5));
w.addObject(&ball);
Intersect xs = Intersect();
xs.add(Intersection(sqrt(2), &floor));
Computation comps = xs[0].prepareComputation(r, &xs);
Tuple c = w.shadeHit(comps, 5);
/* Temporary lower the precision */
set_equal_precision(0.00001);
ASSERT_EQ(c, Colour(0.93391, 0.69643, 0.69243));
set_equal_precision(FLT_EPSILON);
}