682 lines
23 KiB
C++
682 lines
23 KiB
C++
/*!
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* 07_making_scene.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: 14/02/2024
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*
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*/
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/*---------------------------------------------------------------------------*/
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#include <catch.hpp>
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#include "raytracing.h"
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using namespace Raytracer;
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/* ------------------------------------------------------------------------- */
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SCENARIO("Creating a world", "[features/world.feature]")
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{
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GIVEN("w <- world()")
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{
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World w;
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THEN("w contains no objects")
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{
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REQUIRE(w.objects_count() == 0);
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}
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AND_THEN("w has no light source")
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{
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REQUIRE(w.has_light() == false);
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The default world", "[features/world.feature]")
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{
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GIVEN("light <- point_light(point(-10, 10, -10), color(1, 1, 1))")
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{
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PointLight light = PointLight(Tuple::Point(-10, 10, -10), Color(1, 1, 1));
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AND_GIVEN("s1 <- sphere")
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// with:
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// | material.color | (0.8, 1.0, 0.6) |
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// | material.diffuse | 0.7 |
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// | material.specular | 0.2 |
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{
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Sphere s1;
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s1.material().set_color(Color(0.8, 1.0, 0.6));
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s1.material().set_diffuse(0.7);
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s1.material().set_specular(0.2);
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AND_GIVEN("s2 <- sphere")
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// with:
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// | transform | scaling(0.5, 0.5, 0.5) |
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{
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Sphere s2;
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s2.set_transform(Matrix::scaling(0.5, 0.5, 0.5));
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WHEN("w <- default_world")
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{
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World w = World::default_world();
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THEN("w.light = light")
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{
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REQUIRE(w.light() == light);
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}
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AND_THEN("w contains s1")
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{
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REQUIRE(w.contains(s1) == true);
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}
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AND_THEN("w contains s2")
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{
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REQUIRE(w.contains(s2) == true);
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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("Intersect a world with a ray", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("r <- 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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WHEN("xs <- intersect_world(w,r)")
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{
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Intersections xs = w.intersect_world(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].t = 4")
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{
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REQUIRE(xs[0].distance_t() == 4);
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}
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AND_THEN("xs[1].t = 4.5")
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{
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REQUIRE(xs[1].distance_t() == 4.5);
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}
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AND_THEN("xs[2].t = 5.5")
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{
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REQUIRE(xs[2].distance_t() == 5.5);
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}
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AND_THEN("xs[3].t = 6")
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{
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REQUIRE(xs[3].distance_t() == 6);
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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("Precompute the state of an intersection", "[features/intersections.feature]")
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{
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GIVEN("r <- 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_GIVEN("shape <- sphere()")
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{
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Sphere shape;
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AND_GIVEN("i <- intersection(4, shape)")
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{
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Intersection i(4, &shape);
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WHEN("comps <- prepare_computations(i,r)")
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{
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IntersectionData comps = i.prepare_computations(r);
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THEN("comps.t = i.t")
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{
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REQUIRE(comps.distance_t() == i.distance_t());
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}
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AND_THEN("comps.object = i.object")
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{
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REQUIRE(comps.object() == i.object());
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}
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AND_THEN("comps.point = point(0, 0, -1)")
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{
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REQUIRE(comps.point() == Tuple::Point(0, 0, -1));
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}
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AND_THEN("comps.eyev = vector(0, 0, -1)")
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{
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REQUIRE(comps.eyev() == Tuple::Vector(0, 0, -1));
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}
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AND_THEN("comps.normalv = vector(0, 0, -1)")
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{
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REQUIRE(comps.normalv() == Tuple::Vector(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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SCENARIO("The hit, when an intersection occurs on the outside", "[features/intersections.feature]")
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{
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GIVEN("r <- 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_GIVEN("shape <- sphere()")
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{
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Sphere shape;
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AND_GIVEN("i <- intersection(4, shape)")
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{
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Intersection i(4, &shape);
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WHEN("comps <- prepare_computations(i,r)")
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{
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IntersectionData comps = i.prepare_computations(r);
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THEN("comps.inside = false")
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{
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REQUIRE(comps.is_inside() == false);
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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 hit, when an intersection occurs on the inside", "[features/intersections.feature]")
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{
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GIVEN("r <- 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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AND_GIVEN("shape <- sphere()")
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{
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Sphere shape;
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AND_GIVEN("i <- intersection(1, shape)")
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{
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Intersection i(1, &shape);
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WHEN("comps <- prepare_computations(i,r)")
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{
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IntersectionData comps = i.prepare_computations(r);
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THEN("comps.point = point(0, 0, 1)")
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{
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REQUIRE(comps.point() == Tuple::Point(0, 0, 1));
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}
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AND_THEN("comps.eyev = vector(0, 0, -1)")
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{
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REQUIRE(comps.eyev() == Tuple::Vector(0, 0, -1));
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}
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AND_THEN("comps.inside = false")
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{
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REQUIRE(comps.is_inside() == true);
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}
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AND_THEN("comps.normalv = vector(0, 0, -1)")
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{
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REQUIRE(comps.normalv() == Tuple::Vector(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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SCENARIO("Shading an intersection", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("r <- 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_GIVEN("shape <- first object of w")
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{
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Shape *shape = w.objects(0);
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AND_GIVEN("i <- intersection(4, shape)")
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{
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Intersection i(4, shape);
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WHEN("comps <- prepare_computations(i,r)")
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{
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IntersectionData comps = i.prepare_computations(r);
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AND_WHEN("c <- shade_hit(w, comps)")
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{
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Color c = w.shade_hit(comps);
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THEN("c = color(0.38066, 0.47583, 0.2855)")
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{
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REQUIRE(c == Color(0.38066, 0.47583, 0.2855));
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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("Shading an intersection from the inside", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("w.light <- point_light(point(0, 0.25, 0))")
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{
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w.set_light(PointLight(Tuple::Point(0, 0.25, 0), Color(1, 1, 1)));
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AND_GIVEN("r <- 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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AND_GIVEN("shape <- second object of w")
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{
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Shape *shape = w.objects(1);
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AND_GIVEN("i <- intersection(0.5, shape)")
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{
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Intersection i(0.5, shape);
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WHEN("comps <- prepare_computations(i,r)")
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{
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IntersectionData comps = i.prepare_computations(r);
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AND_WHEN("c <- shade_hit(w, comps)")
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{
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Color c = w.shade_hit(comps);
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#if 0 // Not working anymore with shadow.
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THEN("c = color(0.90498, 0.90498, 0.90498)")
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{
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REQUIRE(c == Color(0.90498, 0.90498, 0.90498));
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}
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#endif
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THEN("c = color(0.1, 0.1, 0.1)")
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{
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REQUIRE(c == Color(0.1, 0.1, 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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SCENARIO("The color when a ray misses", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("r <- ray(point(0, 0, -5), vector(0, 1, 0))")
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{
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Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 1, 0));
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WHEN("c <- color_at(w, r)")
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{
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Color c = w.color_at(r);
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THEN("c = color(0, 0, 0)")
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{
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REQUIRE(c == Color(0, 0, 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("The color when a ray hits", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("r <- 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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WHEN("c <- color_at(w, r)")
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{
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Color c = w.color_at(r);
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THEN("c = color(0.38066, 0.47583, 0.2855)")
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{
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REQUIRE(c == Color(0.38066, 0.47583, 0.2855));
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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 color with an intersection behind the ray", "[features/world.feature]")
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{
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GIVEN("w <- default_world()")
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{
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World w = World::default_world();
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AND_GIVEN("outer <- the first object in w")
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{
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Shape *outer = w.objects(0);
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AND_GIVEN("outer.material.ambient <- 1")
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{
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outer->material().set_ambient(1);
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AND_GIVEN("inner <- the second object in w")
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{
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Shape *inner = w.objects(1);
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AND_GIVEN("inner.material.ambient <- 1")
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{
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inner->material().set_ambient(1);
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AND_GIVEN("r <- ray(point(0, 0, 0.75), vector(0, 0, -1))")
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{
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Ray r(Tuple::Point(0, 0, 0.75), Tuple::Vector(0, 0, -1));
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WHEN("c <- color_at(w, r)")
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{
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Color c = w.color_at(r);
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THEN("c = inner.material.color")
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{
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REQUIRE(c == inner->material().color());
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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("The transformation matrix for the default orientation", "[features/transformations.feature]")
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{
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GIVEN("from <- point(0, 0, 0)")
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{
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Tuple from = Tuple::Point(0, 0, 0);
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AND_GIVEN("to <- point(0, 0, -1)")
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{
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Tuple to = Tuple::Point(0, 0, -1);
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AND_GIVEN("up <- vector(0, 1, 0)")
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{
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Tuple up = Tuple::Vector(0, 1, 0);
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WHEN("t <- view_transform(from, to, up)")
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{
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Matrix t = Matrix::view_transform(from, to, up);
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THEN("t = identify_matrix")
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{
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REQUIRE(t == Matrix::identity());
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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 view transformation matrix looking in positive z direction", "[features/transformations.feature]")
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{
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GIVEN("from <- point(0, 0, 0)")
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{
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Tuple from = Tuple::Point(0, 0, 0);
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AND_GIVEN("to <- point(0, 0, 1)")
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{
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Tuple to = Tuple::Point(0, 0, 1);
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AND_GIVEN("up <- vector(0, 1, 0)")
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{
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Tuple up = Tuple::Vector(0, 1, 0);
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WHEN("t <- view_transform(from, to, up)")
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{
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Matrix t = Matrix::view_transform(from, to, up);
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THEN("t = scaling(-1, 1, -1)")
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{
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REQUIRE(t == Matrix::scaling(-1, 1, -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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SCENARIO("A view transformation moves the world", "[features/transformations.feature]")
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{
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GIVEN("from <- point(0, 0, 8)")
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{
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Tuple from = Tuple::Point(0, 0, 8);
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AND_GIVEN("to <- point(0, 0, 0)")
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{
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Tuple to = Tuple::Point(0, 0, 0);
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AND_GIVEN("up <- vector(0, 1, 0)")
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{
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Tuple up = Tuple::Vector(0, 1, 0);
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WHEN("t <- view_transform(from, to, up)")
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{
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Matrix t = Matrix::view_transform(from, to, up);
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THEN("t = translation(0, 0, -8)")
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{
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REQUIRE(t == Matrix::translation(0, 0, -8));
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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("An arbitrary view transformation", "[features/transformations.feature]")
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{
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GIVEN("from <- point(1, 3, 2)")
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{
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Tuple from = Tuple::Point(1, 3, 2);
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AND_GIVEN("to <- point(4, -2, 8)")
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{
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Tuple to = Tuple::Point(4, -2, 8);
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AND_GIVEN("up <- vector(1, 1, 0)")
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{
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Tuple up = Tuple::Vector(1, 1, 0);
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WHEN("t <- view_transform(from, to, up)")
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{
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Matrix t = Matrix::view_transform(from, to, up);
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THEN("t iq the following 4x4 matrix")
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{
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// | -0.50709 | 0.50709 | 0.67612 | -2.36643 |
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// | 0.76772 | 0.60609 | 0.12122 | -2.82843 |
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// | -0.35857 | 0.59761 | -0.71714 | 0.00000 |
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// | 0.00000 | 0.00000 | 0.00000 | 1.00000 |
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REQUIRE(t == Matrix({
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{-0.50709, 0.50709, 0.67612, -2.36643},
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{ 0.76772, 0.60609, 0.12122, -2.82843},
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{-0.35857, 0.59761, -0.71714, 0.00000},
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{ 0.00000, 0.00000, 0.00000, 1.00000}
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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("Constructing a camera", "[features/camera.feature]")
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{
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GIVEN("hsize <- 160")
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{
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uint16_t hsize = 160;
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AND_GIVEN("vsize <- 120")
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{
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uint16_t vsize = 120;
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AND_GIVEN("field_of_view <- pi / 2")
|
|
{
|
|
double field_of_view = std::numbers::pi / 2;
|
|
WHEN("c <- camera(hsize, vsize,field_of_view)")
|
|
{
|
|
Camera c(hsize, vsize, field_of_view);
|
|
THEN("c.hsize = 160")
|
|
{
|
|
REQUIRE(c.hsize() == 160);
|
|
}
|
|
AND_THEN("c.vsize = 120")
|
|
{
|
|
REQUIRE(c.vsize() == 120);
|
|
}
|
|
AND_THEN("c.field_of_view = pi / 2")
|
|
{
|
|
REQUIRE(c.field_of_view() == std::numbers::pi / 2);
|
|
}
|
|
AND_THEN("c.transform = identity_matrix")
|
|
{
|
|
REQUIRE(c.transform() == Matrix::identity());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("The pixel size for a horizontal canvas", "[features/camera.feature]")
|
|
{
|
|
GIVEN("c <- camera(200, 125, pi/2)")
|
|
{
|
|
Camera c(200, 125, std::numbers::pi / 2);
|
|
THEN("c.pixel_size = 0.01")
|
|
{
|
|
REQUIRE(c.pixel_size() == 0.01);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("The pixel size for a vertical canvas", "[features/camera.feature]")
|
|
{
|
|
GIVEN("c <- camera(125, 200, pi/2)")
|
|
{
|
|
Camera c(125, 200, std::numbers::pi / 2);
|
|
THEN("c.pixel_size = 0.01")
|
|
{
|
|
REQUIRE(c.pixel_size() == 0.01);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("Constructing a ray through the center of the canvas", "[features/camera.feature]")
|
|
{
|
|
GIVEN("c <- camera(201, 101, pi/2)")
|
|
{
|
|
Camera c(201, 101, std::numbers::pi / 2);
|
|
WHEN("r <- ray_for_pixel(c, 100, 50)")
|
|
{
|
|
Ray r = c.ray_for_pixel(100, 50);
|
|
THEN("r.origin = point(0, 0, 0)")
|
|
{
|
|
REQUIRE(r.origin() == Tuple::Point(0, 0, 0));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("Constructing a ray through a corner of the canvas", "[features/camera.feature]")
|
|
{
|
|
GIVEN("c <- camera(201, 101, pi/2)")
|
|
{
|
|
Camera c(201, 101, std::numbers::pi / 2);
|
|
WHEN("r <- ray_for_pixel(c, 0, 0)")
|
|
{
|
|
Ray r = c.ray_for_pixel(0, 0);
|
|
THEN("r.origin = point(0, 0, 0)")
|
|
{
|
|
REQUIRE(r.origin() == Tuple::Point(0, 0, 0));
|
|
}
|
|
AND_THEN("r.direction = vector(0.66519, 0.33259, -0.66851)")
|
|
{
|
|
REQUIRE(r.direction() == Tuple::Vector(0.66519, 0.33259, -0.66851));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("Constructing a ray when the camera is transformed", "[features/camera.feature]")
|
|
{
|
|
GIVEN("c <- camera(201, 101, pi/2)")
|
|
{
|
|
Camera c(201, 101, std::numbers::pi / 2);
|
|
WHEN("c.transform <- rotation_y(pi/4) * translation(0, -2, 5)")
|
|
{
|
|
c.set_transform(Matrix::rotation_y(std::numbers::pi / 4) * Matrix::translation(0, -2, 5));
|
|
AND_WHEN("r <- ray_for_pixel(c, 100, 50)")
|
|
{
|
|
Ray r = c.ray_for_pixel(100, 50);
|
|
THEN("r.origin = point(0, 2, -5)")
|
|
{
|
|
REQUIRE(r.origin() == Tuple::Point(0, 2, -5));
|
|
}
|
|
AND_THEN("r.direction = vector(sqrt(2) / 2, 0, -sqrt(2) / 2)")
|
|
{
|
|
REQUIRE(r.direction() == Tuple::Vector(sqrt(2) / 2, 0, -sqrt(2) / 2));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
SCENARIO("Rendering a world with the camera", "[features/camera.feature]")
|
|
{
|
|
GIVEN("w <- default_world()")
|
|
{
|
|
World w = World::default_world();
|
|
AND_GIVEN("c <- camera(11, 11, pi/2)")
|
|
{
|
|
Camera c(11, 11, std::numbers::pi / 2);
|
|
AND_GIVEN("from <- point(0, 0, -5)")
|
|
{
|
|
Tuple from = Tuple::Point(0, 0, -5);
|
|
AND_GIVEN("to <- point(0, 0, 0)")
|
|
{
|
|
Tuple to = Tuple::Point(0, 0, 0);
|
|
AND_GIVEN("up <- vector(0, 1, 0)")
|
|
{
|
|
Tuple up = Tuple::Vector(0, 1, 0);
|
|
AND_GIVEN("c.transform <- view_transform(from, to, up)")
|
|
{
|
|
c.set_transform(Matrix::view_transform(from, to, up));
|
|
WHEN("image <- c.render(w)")
|
|
{
|
|
Canvas image = c.render(w);
|
|
THEN("pixel_at(image, 5, 5) = color(0.38066, 0.47583, 0.2855)")
|
|
{
|
|
REQUIRE(image.pixel_at(5, 5) == Color(0.38066, 0.47583, 0.2855));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|