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- /*
- * DoRayMe - a quick and dirty Raytracer
- * Transformations unit tests
- *
- * Created by Manoël Trapier
- * Copyright (c) 2020 986-Studio.
- *
- */
- #include <transformation.h>
- #include <tuple.h>
- #include <math.h>
- #include <gtest/gtest.h>
- TEST(TransformationTest, Multiplying_by_a_translation_matrix)
- {
- Matrix transform = translation(5, -3, 2);
- Point p = Point(-3, 4, 5);
-
- ASSERT_EQ(transform * p, Point(2, 1, 7));
- }
- TEST(TransformationTest, Multiplying_by_the_inverse_of_a_translation_matrix)
- {
- Matrix transform = translation(5, -3, 2);
- Matrix inv = transform.inverse();
-
- Point p = Point(-3, 4, 5);
-
- ASSERT_EQ(inv * p, Point(-8, 7, 3));
- }
- TEST(TransformationTest, Translation_does_not_affect_vectors)
- {
- Matrix transform = translation(5, -3, 2);
-
- Vector v = Vector(-3, 4, 5);
-
- ASSERT_EQ(transform * v, Vector(-3, 4, 5));
- }
- TEST(TransformationTest, A_scaling_matrix_applied_to_a_point)
- {
- Matrix transform = scaling(2, 3, 4);
-
- Point p = Point(-4, 6, 8);
-
- ASSERT_EQ(transform * p, Point(-8, 18, 32));
- }
- TEST(TransformationTest, A_scaling_matrix_applied_to_a_vector)
- {
- Matrix transform = scaling(2, 3, 4);
-
- Vector v = Vector(-4, 6, 8);
-
- ASSERT_EQ(transform * v, Vector(-8, 18, 32));
- }
- TEST(TransformationTest, Multiplaying_by_the_inverse_of_a_scaling_matrix)
- {
- Matrix transform = scaling(2, 3, 4);
- Matrix inv = transform.inverse();
-
- Vector v = Vector(-4, 6, 8);
-
- ASSERT_EQ(inv * v, Vector(-2, 2, 2));
- }
- TEST(TransformationTest, Reflexion_is_scaling_by_a_negative_value)
- {
- Matrix transform = scaling(-1, 1, 1);
-
- Point p = Point(2, 3, 4);
-
- ASSERT_EQ(transform * p, Point(-2, 3, 4));
- }
- TEST(TransformationTest, Rotating_a_point_around_the_X_axis)
- {
- Point p = Point(0, 1, 0);
- Matrix half_quarter = rotation_x(M_PI / 4.);
- Matrix full_quarter = rotation_x(M_PI / 2.);
-
- ASSERT_EQ(half_quarter * p, Point(0, sqrt(2)/2, sqrt(2)/2));
- ASSERT_EQ(full_quarter * p, Point(0, 0, 1));
- }
- TEST(TransformationTest, The_inverse_of_an_x_rotation_rotates_in_the_opposite_direction)
- {
- Point p = Point(0, 1, 0);
- Matrix half_quarter = rotation_x(M_PI / 4.);
- Matrix inv = half_quarter.inverse();
-
- ASSERT_EQ(inv * p, Point(0, sqrt(2)/2, -sqrt(2)/2));
- }
- TEST(TransformationTest, Rotating_a_point_around_the_Y_axis)
- {
- Point p = Point(0, 0, 1);
- Matrix half_quarter = rotation_y(M_PI / 4.);
- Matrix full_quarter = rotation_y(M_PI / 2.);
-
- ASSERT_EQ(half_quarter * p, Point(sqrt(2)/2, 0, sqrt(2)/2));
- ASSERT_EQ(full_quarter * p, Point(1, 0, 0));
- }
- TEST(TransformationTest, Rotating_a_point_around_the_Z_axis)
- {
- Point p = Point(0, 1, 0);
- Matrix half_quarter = rotation_z(M_PI / 4.);
- Matrix full_quarter = rotation_z(M_PI / 2.);
-
- ASSERT_EQ(half_quarter * p, Point(-sqrt(2)/2, sqrt(2)/2, 0));
- ASSERT_EQ(full_quarter * p, Point(-1, 0, 0));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_x_in_proportion_to_y)
- {
- Matrix transform = shearing(1, 0, 0, 0, 0, 0);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(5, 3, 4));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_x_in_proportion_to_z)
- {
- Matrix transform = shearing(0, 1, 0, 0, 0, 0);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(6, 3, 4));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_y_in_proportion_to_x)
- {
- Matrix transform = shearing(0, 0, 1, 0, 0, 0);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(2, 5, 4));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_y_in_proportion_to_z)
- {
- Matrix transform = shearing(0, 0, 0, 1, 0, 0);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(2, 7, 4));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_z_in_proportion_to_x)
- {
- Matrix transform = shearing(0, 0, 0, 0, 1, 0);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(2, 3, 6));
- }
- TEST(TransformationTest, A_shearing_transformation_moves_z_in_proportion_to_y)
- {
- Matrix transform = shearing(0, 0, 0, 0, 0, 1);
- Point p = Point(2, 3, 4);
- ASSERT_EQ(transform * p, Point(2, 3, 7));
- }
- TEST(TransformationTest, Individual_trnasformations_are_applied_in_sequence)
- {
- Point p = Point(1, 0, 1);
- Matrix A = rotation_x(M_PI / 2.);
- Matrix B = scaling(5, 5, 5);
- Matrix C = translation(10, 5, 7);
- Tuple p2 = A * p;
- ASSERT_EQ(p2, Point(1, -1, 0));
- Tuple p3 = B * p2;
- ASSERT_EQ(p3, Point(5, -5, 0));
- Tuple p4 = C * p3;
- ASSERT_EQ(p4, Point(15, 0, 7));
- }
- TEST(TransformationTest, Chained_transformation_must_be_applied_in_reverse_order)
- {
- Point p = Point(1, 0, 1);
- Matrix A = rotation_x(M_PI / 2.);
- Matrix B = scaling(5, 5, 5);
- Matrix C = translation(10, 5, 7);
- Matrix T = C * B * A;
- ASSERT_EQ(T * p, Point(15, 0, 7));
- }
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