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- /*
- * DoRayMe - a quick and dirty Raytracer
- * Sphere unit tests
- *
- * Created by Manoël Trapier
- * Copyright (c) 2020 986-Studio.
- *
- */
- #include <ray.h>
- #include <sphere.h>
- #include <material.h>
- #include <transformation.h>
- #include <gtest/gtest.h>
- TEST(SphereTest, A_ray_intersect_a_sphere_at_two_points)
- {
- Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
- Sphere s = Sphere();
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 2);
- ASSERT_EQ(xs[0].t, 4.0);
- ASSERT_EQ(xs[1].t, 6.0);
- }
- TEST(SphereTest, A_ray_intersect_a_sphere_at_a_tangent)
- {
- Ray r = Ray(Point(0, 1, -5), Vector(0, 0, 1));
- Sphere s = Sphere();
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 2);
- ASSERT_EQ(xs[0].t, 5.0);
- ASSERT_EQ(xs[1].t, 5.0);
- }
- TEST(SphereTest, A_ray_miss_a_sphere)
- {
- Ray r = Ray(Point(0, 2, -5), Vector(0, 0, 1));
- Sphere s = Sphere();
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 0);
- }
- TEST(SphereTest, A_ray_originate_inside_a_sphere)
- {
- Ray r = Ray(Point(0, 0, 0), Vector(0, 0, 1));
- Sphere s = Sphere();
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 2);
- ASSERT_EQ(xs[0].t, -1.0);
- ASSERT_EQ(xs[1].t, 1.0);
- }
- TEST(SphereTest, A_sphere_is_behind_a_ray)
- {
- Ray r = Ray(Point(0, 0, 5), Vector(0, 0, 1));
- Sphere s = Sphere();
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 2);
- ASSERT_EQ(xs[0].t, -6.0);
- ASSERT_EQ(xs[1].t, -4.0);
- }
- TEST(SphereTest, A_sphere_default_transformation)
- {
- Sphere s = Sphere();
- ASSERT_EQ(s.transformMatrix, Matrix4().identity());
- }
- TEST(SphereTest, Changing_a_sphere_transformation)
- {
- Sphere s = Sphere();
- Matrix t = translation(2, 3, 4);
- s.setTransform(t);
- ASSERT_EQ(s.transformMatrix, t);
- }
- TEST(SphereTest, Intersecting_a_scaled_sphere_with_a_ray)
- {
- Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
- Sphere s = Sphere();
- s.setTransform(scaling(2, 2, 2));
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 2);
- ASSERT_EQ(xs[0].t, 3.0);
- ASSERT_EQ(xs[1].t, 7.0);
- }
- TEST(SphereTest, Intersecting_a_translated_sphere_with_a_ray)
- {
- Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
- Sphere s = Sphere();
- s.setTransform(translation(5, 0, 0));
- Intersect xs = s.intersect(r);
- ASSERT_EQ(xs.count(), 0);
- }
- TEST(SphereTest, The_normal_on_a_sphere_at_a_point_on_the_X_axis)
- {
- Sphere s = Sphere();
- Tuple n = s.normalAt(Point(1, 0, 0));
- ASSERT_EQ(n, Vector(1, 0, 0));
- }
- TEST(SphereTest, The_normal_on_a_sphere_at_a_point_on_the_Y_axis)
- {
- Sphere s = Sphere();
- Tuple n = s.normalAt(Point(0, 1, 0));
- ASSERT_EQ(n, Vector(0, 1, 0));
- }
- TEST(SphereTest, The_normal_on_a_sphere_at_a_point_on_the_Z_axis)
- {
- Sphere s = Sphere();
- Tuple n = s.normalAt(Point(0, 0, 1));
- ASSERT_EQ(n, Vector(0, 0, 1));
- }
- TEST(SphereTest, The_normal_on_a_sphere_at_a_nonaxial_point)
- {
- Sphere s = Sphere();
- Tuple n = s.normalAt(Point(sqrt(3)/3, sqrt(3)/3, sqrt(3)/3));
- ASSERT_EQ(n, Vector(sqrt(3)/3, sqrt(3)/3, sqrt(3)/3));
- }
- TEST(SphereTest, The_normal_is_a_normalise_vector)
- {
- Sphere s = Sphere();
- Tuple n = s.normalAt(Point(sqrt(3)/3, sqrt(3)/3, sqrt(3)/3));
- ASSERT_EQ(n, n.normalise());
- }
- TEST(SphereTest, Computing_the_normal_on_a_translated_sphere)
- {
- Sphere s = Sphere();
- s.setTransform(translation(0, 1, 0));
- Tuple n = s.normalAt(Point(0, 1.70711, -0.70711));
- set_equal_precision(0.0001);
- ASSERT_EQ(n, Vector(0, 0.70711, -0.70711));
- /* Revert to default */
- set_equal_precision(FLT_EPSILON);
- }
- TEST(SphereTest, Computing_the_normal_on_a_tranformed_sphere)
- {
- Sphere s = Sphere();
- s.setTransform(scaling(1, 0.5, 1) * rotationZ(M_PI / 5));
- Tuple n = s.normalAt(Point(0, sqrt(2)/2, -sqrt(2)/2));
- set_equal_precision(0.0001);
- ASSERT_EQ(n, Vector(0, 0.97014, -0.24254));
- /* Revert to default */
- set_equal_precision(FLT_EPSILON);
- }
- TEST(SphereTest, A_sphere_have_a_default_material)
- {
- Sphere s = Sphere();
- Material m = Material();
- ASSERT_EQ(s.material, m);
- }
- TEST(SphereTest, A_sphere_may_be_assigned_a_material)
- {
- Sphere s = Sphere();
- Material m = Material();
- m.ambient = 1;
- s.setMaterial(m);
- ASSERT_EQ(s.material, m);
- }
- TEST(SphereTest, A_helper_for_producing_a_sphere_with_a_glassy_material)
- {
- GlassSphere s = GlassSphere();
- ASSERT_EQ(s.transformMatrix, Matrix4().identity());
- ASSERT_EQ(s.material.transparency, 1.0);
- ASSERT_EQ(s.material.refractiveIndex, 1.5);
- }
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