188 lines
6.8 KiB
C++
188 lines
6.8 KiB
C++
/*!
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* 12_cubes.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: 13/03/2024
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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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using namespace Raytracer;
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/* ------------------------------------------------------------------------- */
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class CubeTestIntersect
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{
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public:
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Tuple origin;
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Tuple direction;
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double t1;
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double t2;
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};
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/* ------------------------------------------------------------------------- */
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class CubeTestNormal
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{
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public:
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Tuple point;
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Tuple normal;
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};
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/* ------------------------------------------------------------------------- */
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SCENARIO("A Ray intersects a cube", "[features/cubes.feature]")
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{
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// | | origin | direction | t1 | t2 |
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// | +x | point(5, 0.5, 0) | vector(-1, 0, 0) | 4 | 6 |
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// | -x | point(-5, 0.5, 0) | vector( 1, 0, 0) | 4 | 6 |
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// | +y | point(0.5, 5, 0) | vector( 0,-1, 0) | 4 | 6 |
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// | -y | point(0.5, -5, 0) | vector( 0, 1, 0) | 4 | 6 |
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// | +z | point(0.5, 0, 5) | vector( 0, 0,-1) | 4 | 6 |
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// | -z | point(0.5, 0, -5) | vector( 0, 0, 1) | 4 | 6 |
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// | inside | point(0, 0.5, 0) | vector( 0, 0, 1) | -1 | -1 |
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CubeTestIntersect the_test[] = {
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{ Tuple::Point(5.0, 0.5, 0.0), Tuple::Vector(-1, 0, 0), 4, 6},
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{Tuple::Point(-5.0, 0.5, 0.0), Tuple::Vector(1, 0, 0), 4, 6},
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{ Tuple::Point(0.5, 5.0, 0.0), Tuple::Vector(0, -1, 0), 4, 6},
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{ Tuple::Point(0.5, -5.0, 0.0), Tuple::Vector(0, 1, 0), 4, 6},
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{ Tuple::Point(0.5, 0.0, 5.0), Tuple::Vector(0, 0, -1), 4, 6},
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{ Tuple::Point(0.5, 0.0, -5.0), Tuple::Vector(0, 0, 1), 4, 6},
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{ Tuple::Point(0.0, 0.5, 0.0), Tuple::Vector(0, 0, 1), -1, -1}
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};
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GIVEN("c <- cube()")
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{
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Cube c;
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AND_GIVEN("r <- ray(<origin>, <direction>)")
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{
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WHEN("xs <- local_intersect(c,r)")
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{
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for (int i = 0; i < 7; i++)
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{
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Ray r(the_test[i].origin, the_test[i].direction);
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Intersections xs = c.local_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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AND_THEN("xs[0].t = <t1>")
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{
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REQUIRE(xs[0].distance_t() == the_test[i].t1);
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}
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AND_THEN("xs[1].t = <t2>")
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{
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REQUIRE(xs[1].distance_t() == the_test[i].t2);
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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("A Ray misses a cube", "[features/cubes.feature]")
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{
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// | point | direction |
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// | point(-2, 0, 0) | vector(0.2673, 0.5345, 0.8018) |
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// | point(0, -2, 0) | vector(0.8018, 0.2673, 0.5345) |
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// | point(0, 0, -2) | vector(0.5345, 0.8018, 0.2673) |
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// | point(2, 0, 2) | vector(0, 0, -1) |
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// | point(0, 2, 2) | vector(0, -1, 0) |
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// | point(2, 2, 0) | vector(-1, 0, 0) |
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CubeTestIntersect the_test[] = {
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{Tuple::Point(-2, 0, 0), Tuple::Vector(0.2673, 0.5345, 0.8018), -1, -1},
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{ Tuple::Point(0, -2, 0), Tuple::Vector(0.8018, 0.2673, 0.5345), -1, -1},
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{ Tuple::Point(0, 0, -2), Tuple::Vector(0.5345, 0.8018, 0.2673), -1, -1},
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{ Tuple::Point(2, 0, 2), Tuple::Vector(0, 0, -1), -1, -1},
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{ Tuple::Point(0, 2, 2), Tuple::Vector(0, -1, 0), -1, -1},
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{ Tuple::Point(2, 2, 0), Tuple::Vector(-1, 0, 0), -1, -1}
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};
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GIVEN("c <- cube()")
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{
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Cube c;
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AND_GIVEN("r <- ray(<origin>, <direction>)")
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{
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WHEN("xs <- local_intersect(c,r)")
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{
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for (int i = 0; i < 6; i++)
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{
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Ray r(the_test[i].origin, the_test[i].direction);
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Intersections xs = c.local_intersect(r);
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THEN("xs.count = 0")
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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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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal on the surface of a cube", "[features/cubes.feature]")
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{
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// | origin | normal |
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// | point(1, 0.5, -0.8) | vector(1, 0, 0) |
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// | point(-1, -0.2, 0.9) | vector(-1, 0, 0) |
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// | point(-0.4, 1, -0.1) | vector(0, 1, 0) |
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// | point(0.3, -1, -0.7) | vector(0, -1, 0) |
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// | point(-0.6, 0.3, 1) | vector(0, 0, 1) |
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// | point(0.4, 0.4, -1) | vector(0, 0, -1) |
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// | point(1, 1, -1) | vector(1, 0, 0) |
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// | point(-1,-1, -1) | vector(-1, 0, 0) |
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CubeTestNormal the_test[] = {
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{ Tuple::Point(1, 0.5, -0.8), Tuple::Vector(1, 0, 0)},
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{ Tuple::Point(-1, -0.2, 0.9), Tuple::Vector(-1, 0, 0)},
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{Tuple::Point(-0.4, 1, -0.1), Tuple::Vector(0, 1, 0)},
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{ Tuple::Point(0.3, -1, -0.7), Tuple::Vector(0, -1, 0)},
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{Tuple::Point(-0.6, 0.3, 1), Tuple::Vector(0, 0, 1)},
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{ Tuple::Point(0.4, 0.4, -1), Tuple::Vector(0, 0, -1)},
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{ Tuple::Point(1, 1, -1), Tuple::Vector(1, 0, 0)},
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{ Tuple::Point(-1, -1, -1), Tuple::Vector(-1, 0, 0)}
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};
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GIVEN("c <- cube()")
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{
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Cube c;
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AND_GIVEN("p <- <point>)")
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{
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WHEN("normal <- local_normal_at(p)")
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{
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for (int i = 0; i < 8; i++)
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{
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Tuple p = the_test[i].point;
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Tuple normal = c.local_normal_at(p);
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THEN("normal = <normal>")
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{
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REQUIRE(normal == the_test[i].normal);
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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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