365 lines
13 KiB
C++
365 lines
13 KiB
C++
/*!
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* 14_groups.cpp
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*
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* Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* @Author: NADAL Jean-Baptiste
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* @Date: 21/03/2024
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*
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*/
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/*---------------------------------------------------------------------------*/
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#include <catch2/catch_test_macros.hpp>
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#include "raytracing.h"
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#include "common_data.h"
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using namespace Raytracer;
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/* ------------------------------------------------------------------------- */
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SCENARIO("Creating a new group", "[features/groups.feature]")
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{
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GIVEN("g <- group()")
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{
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Group g;
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THEN("g.transform = identity_matrix")
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{
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REQUIRE(g.transform() == Matrix::identity());
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}
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AND_THEN("g is empty")
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{
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REQUIRE(g.is_empty() == true);
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A shape has a parent attribute", "[features/shapes.feature]")
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{
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GIVEN("s <- test_shape()")
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{
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TestShape s;
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THEN("s.parent is nothing")
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{
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REQUIRE(s.parent() == nullptr);
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Adding a child to a group", "[features/groups.feature]")
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{
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GIVEN("g <- group()")
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{
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Group g;
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GIVEN("s <- test_shape()")
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{
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TestShape s;
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WHEN("add_child(g, s)")
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{
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g.add_child(&s);
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THEN("g is not empty")
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{
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REQUIRE(g.is_empty() == false);
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}
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AND_THEN("g includes s")
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{
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REQUIRE(g.contains(s) == true);
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}
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AND_THEN("s.parent = g")
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{
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REQUIRE(s.parent() == &g);
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a ray with an empty group", "[features/groups.feature]")
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{
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GIVEN("g <- group()")
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{
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Group g;
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AND_GIVEN("ray(point(0, 0, 0), vector(0, 0, 1)")
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{
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Ray r(Tuple::Point(0, 0, 0), Tuple::Vector(0, 0, 1));
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WHEN("xs <-local_intersect(g, r)")
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{
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Intersections xs = g.local_intersect(r);
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THEN("xs is empty")
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{
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REQUIRE(xs.count() == 0);
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a ray with a nonempty group", "[features/groups.feature]")
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{
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GIVEN("g <- group()")
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{
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Group g;
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AND_GIVEN("s1 <- sphere()")
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{
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Sphere s1;
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AND_GIVEN("s2 <- sphere()")
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{
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Sphere s2;
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AND_GIVEN("set_transform(s2, translation(0, 0, -3))")
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{
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s2.set_transform(Matrix::translation(0, 0, -3));
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AND_GIVEN("s3 <- sphere()")
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{
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Sphere s3;
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AND_GIVEN("set_transform(s3, translation(5, 0, 0))")
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{
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s3.set_transform(Matrix::translation(5, 0, 0));
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AND_GIVEN("add_child(g, s1)")
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{
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g.add_child(&s1);
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AND_GIVEN("add_child(g, s2)")
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{
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g.add_child(&s2);
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AND_GIVEN("add_child(g, s3)")
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{
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g.add_child(&s3);
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WHEN("ray(point(0, 0, -5), vector(0, 0, 1)")
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{
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Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
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AND_WHEN("xs <-local_intersect(g, r)")
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{
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Intersections xs = g.local_intersect(r);
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THEN("xs.count = 4")
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{
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REQUIRE(xs.count() == 4);
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}
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AND_THEN("xs[0].object = s2")
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{
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REQUIRE(*xs[0].object() == s2);
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}
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AND_THEN("xs[1].object = s2")
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{
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REQUIRE(*xs[1].object() == s2);
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}
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AND_THEN("xs[2].object = s1")
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{
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REQUIRE(*xs[2].object() == s1);
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}
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AND_THEN("xs[3].object = s1")
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{
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REQUIRE(*xs[3].object() == s1);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a transformed group", "[features/groups.feature]")
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{
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GIVEN("g <- group()")
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{
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Group g;
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AND_GIVEN("set_transform(g, scaling(2, 2, 2))")
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{
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g.set_transform(Matrix::scaling(2, 2, 2));
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AND_GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("set_transform(s, translation(5, 0, 0))")
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{
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s.set_transform(Matrix::translation(5, 0, 0));
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AND_GIVEN("add_child(g, s)")
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{
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g.add_child(&s);
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WHEN("ray(point(10, 0, -10), vector(0, 0, 1)")
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{
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Ray r(Tuple::Point(10, 0, -10), Tuple::Vector(0, 0, 1));
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AND_WHEN("xs <-intersect(g, r)")
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{
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Intersections xs = g.intersect(r);
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THEN("xs.count = 2")
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{
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REQUIRE(xs.count() == 2);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Converting a point from world to object space", "[features/shapes.feature]")
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{
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GIVEN("g1 <- group()")
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{
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Group g1;
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AND_GIVEN("set_transform(g1, rotation_y(pi/2))")
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{
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g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2));
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GIVEN("g2 <- group()")
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{
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Group g2;
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AND_GIVEN("set_transform(g2, scaling(2, 2, 2))")
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{
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g2.set_transform(Matrix::scaling(2, 2, 2));
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AND_GIVEN("add_child(g1, g2)")
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{
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g1.add_child(&g2);
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AND_GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("set_transform(s, translation(5, 0, 0))")
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{
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s.set_transform(Matrix::translation(5, 0, 0));
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AND_GIVEN("add_child(g2, s)")
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{
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g2.add_child(&s);
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WHEN("p <- world_to_object(s, point(-2, 0, -10))")
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{
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Tuple p = s.world_to_object(Tuple::Point(-2, 0, -10));
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THEN("p = point(0, 0, -1)")
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{
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REQUIRE(p == Tuple::Point(0, 0, -1));
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Converting a normal from object to world space", "[features/shapes.feature]")
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{
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GIVEN("g1 <- group()")
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{
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Group g1;
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AND_GIVEN("set_transform(g1, rotation_y(pi/2))")
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{
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g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2));
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GIVEN("g2 <- group()")
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{
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Group g2;
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AND_GIVEN("set_transform(g2, scaling(1, 2, 3))")
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{
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g2.set_transform(Matrix::scaling(1, 2, 3));
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AND_GIVEN("add_child(g1, g2)")
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{
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g1.add_child(&g2);
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AND_GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("set_transform(s, translation(5, 0, 0))")
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{
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s.set_transform(Matrix::translation(5, 0, 0));
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AND_GIVEN("add_child(g2, s)")
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{
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g2.add_child(&s);
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WHEN("n <- normal_to_world(s, vector(sqrt(3)/3, sqrt(3)/3, sqrt(3)/3))")
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{
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Tuple n = s.normal_to_world(Tuple::Vector(sqrt(3) / 3, sqrt(3) / 3, sqrt(3) / 3));
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THEN("n = vector(0.2857, 0.4286, -0.8571)")
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{
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REQUIRE(n == Tuple::Vector(0.2857, 0.4286, -0.8571));
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Finding the normal on a child object", "[features/shapes.feature]")
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{
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GIVEN("g1 <- group()")
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{
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Group g1;
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AND_GIVEN("set_transform(g1, rotation_y(pi/2))")
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{
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g1.set_transform(Matrix::rotation_y(std::numbers::pi / 2));
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GIVEN("g2 <- group()")
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{
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Group g2;
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AND_GIVEN("set_transform(g2, scaling(1, 2, 3))")
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{
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g2.set_transform(Matrix::scaling(1, 2, 3));
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AND_GIVEN("add_child(g1, g2)")
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{
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g1.add_child(&g2);
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AND_GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("set_transform(s, translation(5, 0, 0))")
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{
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s.set_transform(Matrix::translation(5, 0, 0));
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AND_GIVEN("add_child(g2, s)")
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{
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g2.add_child(&s);
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WHEN("n <- normal_at(s, point(1.7321, 1.1547, -5.5774))")
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{
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Tuple n = s.normal_at(Tuple::Point(1.7321, 1.1547, -5.5774));
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THEN("n = vector(0.2857, 0.4286, -0.8571)")
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{
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REQUIRE(n == Tuple::Vector(0.2857, 0.4286, -0.8571));
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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