/*! * 14_groups.cpp * * Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA * * @Author: NADAL Jean-Baptiste * @Date: 21/03/2024 * */ /*---------------------------------------------------------------------------*/ #include #include "raytracing.h" #include "common_data.h" using namespace Raytracer; /* ------------------------------------------------------------------------- */ SCENARIO("Creating a new group", "[features/groups.feature]") { GIVEN("g <- group()") { Group g; THEN("g.transform = identity_matrix") { REQUIRE(g.transform() == Matrix::identity()); } AND_THEN("g is empty") { REQUIRE(g.is_empty() == true); } } } /* ------------------------------------------------------------------------- */ SCENARIO("A shape has a parent attribute", "[features/shapes.feature]") { GIVEN("s <- test_shape()") { TestShape s; THEN("s.parent is nothing") { REQUIRE(s.parent() == nullptr); } } } /* ------------------------------------------------------------------------- */ SCENARIO("Adding a child to a group", "[features/groups.feature]") { GIVEN("g <- group()") { Group g; GIVEN("s <- test_shape()") { TestShape s; WHEN("add_child(g, s)") { g.add_child(&s); THEN("g is not empty") { REQUIRE(g.is_empty() == false); } AND_THEN("g includes s") { REQUIRE(g.contains(s) == true); } AND_THEN("s.parent = g") { REQUIRE(s.parent() == &g); } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Intersecting a ray with an empty group", "[features/groups.feature]") { GIVEN("g <- group()") { Group g; AND_GIVEN("ray(point(0, 0, 0), vector(0, 0, 1)") { Ray r(Tuple::Point(0, 0, 0), Tuple::Vector(0, 0, 1)); WHEN("xs <-local_intersect(g, r)") { Intersections xs = g.local_intersect(r); THEN("xs is empty") { REQUIRE(xs.count() == 0); } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Intersecting a ray with a nonempty group", "[features/groups.feature]") { GIVEN("g <- group()") { Group g; AND_GIVEN("s1 <- sphere()") { Sphere s1; AND_GIVEN("s2 <- sphere()") { Sphere s2; AND_GIVEN("set_transform(s2, translation(0, 0, -3))") { s2.set_transform(Matrix::translation(0, 0, -3)); AND_GIVEN("s3 <- sphere()") { Sphere s3; AND_GIVEN("set_transform(s3, translation(5, 0, 0))") { s3.set_transform(Matrix::translation(5, 0, 0)); AND_GIVEN("add_child(g, s1)") { g.add_child(&s1); AND_GIVEN("add_child(g, s2)") { g.add_child(&s2); AND_GIVEN("add_child(g, s3)") { g.add_child(&s3); WHEN("ray(point(0, 0, -5), vector(0, 0, 1)") { Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1)); AND_WHEN("xs <-local_intersect(g, r)") { Intersections xs = g.local_intersect(r); THEN("xs.count = 4") { REQUIRE(xs.count() == 4); } AND_THEN("xs[0].object = s2") { REQUIRE(*xs[0].object() == s2); } AND_THEN("xs[1].object = s2") { REQUIRE(*xs[1].object() == s2); } AND_THEN("xs[2].object = s1") { REQUIRE(*xs[2].object() == s1); } AND_THEN("xs[3].object = s1") { REQUIRE(*xs[3].object() == s1); } } } } } } } } } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Intersecting a transformed group", "[features/groups.feature]") { GIVEN("g <- group()") { Group g; AND_GIVEN("set_transform(g, scaling(2, 2, 2))") { g.set_transform(Matrix::scaling(2, 2, 2)); AND_GIVEN("s <- sphere()") { Sphere s; AND_GIVEN("set_transform(s, translation(5, 0, 0))") { s.set_transform(Matrix::translation(5, 0, 0)); AND_GIVEN("add_child(g, s)") { g.add_child(&s); WHEN("ray(point(10, 0, -10), vector(0, 0, 1)") { Ray r(Tuple::Point(10, 0, -10), Tuple::Vector(0, 0, 1)); AND_WHEN("xs <-intersect(g, r)") { Intersections xs = g.intersect(r); THEN("xs.count = 2") { REQUIRE(xs.count() == 2); } } } } } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Converting a point from world to object space", "[features/shapes.feature]") { GIVEN("g1 <- group()") { Group g1; AND_GIVEN("set_transform(g1, rotation_y(pi/2))") { g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2)); GIVEN("g2 <- group()") { Group g2; AND_GIVEN("set_transform(g2, scaling(2, 2, 2))") { g2.set_transform(Matrix::scaling(2, 2, 2)); AND_GIVEN("add_child(g1, g2)") { g1.add_child(&g2); AND_GIVEN("s <- sphere()") { Sphere s; AND_GIVEN("set_transform(s, translation(5, 0, 0))") { s.set_transform(Matrix::translation(5, 0, 0)); AND_GIVEN("add_child(g2, s)") { g2.add_child(&s); WHEN("p <- world_to_object(s, point(-2, 0, -10))") { Tuple p = s.world_to_object(Tuple::Point(-2, 0, -10)); THEN("p = point(0, 0, -1)") { REQUIRE(p == Tuple::Point(0, 0, -1)); } } } } } } } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Converting a normal from object to world space", "[features/shapes.feature]") { GIVEN("g1 <- group()") { Group g1; AND_GIVEN("set_transform(g1, rotation_y(pi/2))") { g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2)); GIVEN("g2 <- group()") { Group g2; AND_GIVEN("set_transform(g2, scaling(1, 2, 3))") { g2.set_transform(Matrix::scaling(1, 2, 3)); AND_GIVEN("add_child(g1, g2)") { g1.add_child(&g2); AND_GIVEN("s <- sphere()") { Sphere s; AND_GIVEN("set_transform(s, translation(5, 0, 0))") { s.set_transform(Matrix::translation(5, 0, 0)); AND_GIVEN("add_child(g2, s)") { g2.add_child(&s); WHEN("n <- normal_to_world(s, vector(sqrt(3)/3, sqrt(3)/3, sqrt(3)/3))") { Tuple n = s.normal_to_world(Tuple::Vector(sqrt(3) / 3, sqrt(3) / 3, sqrt(3) / 3)); THEN("n = vector(0.2857, 0.4286, -0.8571)") { REQUIRE(n == Tuple::Vector(0.2857, 0.4286, -0.8571)); } } } } } } } } } } } /* ------------------------------------------------------------------------- */ SCENARIO("Finding the normal on a child object", "[features/shapes.feature]") { GIVEN("g1 <- group()") { Group g1; AND_GIVEN("set_transform(g1, rotation_y(pi/2))") { g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2)); GIVEN("g2 <- group()") { Group g2; AND_GIVEN("set_transform(g2, scaling(1, 2, 3))") { g2.set_transform(Matrix::scaling(1, 2, 3)); AND_GIVEN("add_child(g1, g2)") { g1.add_child(&g2); AND_GIVEN("s <- sphere()") { Sphere s; AND_GIVEN("set_transform(s, translation(5, 0, 0))") { s.set_transform(Matrix::translation(5, 0, 0)); AND_GIVEN("add_child(g2, s)") { g2.add_child(&s); WHEN("n <- normal_at(s, point(1.7321, 1.1547, -5.5774))") { Tuple n = s.normal_at(Tuple::Point(1.7321, 1.1547, -5.5774)); THEN("n = vector(0.2857, 0.4286, -0.8571)") { REQUIRE(n == Tuple::Vector(0.2857, 0.4286, -0.8571)); } } } } } } } } } } }