332 lines
9.3 KiB
C++
332 lines
9.3 KiB
C++
/*!
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* 05_rays.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: 05/02/2024
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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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/* ------------------------------------------------------------------------- */
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SCENARIO("Creating and querying a ray", "[features/rays.feature]")
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{
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GIVEN("origin <- point(1, 2, 3)")
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{
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Tuple origin = Tuple::Point(1, 2, 3);
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AND_GIVEN("direction <- vector(4, 5, 6)")
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{
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Tuple direction = Tuple::Vector(4, 5, 6);
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WHEN("r <- ray(origin, direction)")
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{
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Ray r(origin, direction);
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THEN("r.origin = origin")
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{
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REQUIRE(r.origin() == origin);
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}
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AND_THEN("r.direction = direction")
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{
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REQUIRE(r.direction() == direction);
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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("Computing a point from a distance", "[features/rays.feature]")
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{
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GIVEN("r <- ray(point(2, 3, 4), vector(1, 0, 0))")
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{
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Ray r(Tuple::Point(2, 3, 4), Tuple::Vector(1, 0, 0));
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THEN("position(r,0) = point(2, 3, 4)")
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{
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REQUIRE(r.position(0) == Tuple::Point(2, 3, 4));
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}
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AND_THEN("position(r,1) == point(3, 3, 4)")
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{
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REQUIRE(r.position(1) == Tuple::Point(3, 3, 4));
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}
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AND_THEN("position(r,-1) = point(1, 3, 4)")
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{
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REQUIRE(r.position(-1) == Tuple::Point(1, 3, 4));
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}
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AND_THEN("position(r,2.5) == point(4.5, 3, 4)")
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{
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REQUIRE(r.position(2.5) == Tuple::Point(4.5, 3, 4));
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A ray intersects a sphere at two points", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == 4.0);
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REQUIRE(xs[1].distance_t() == 6.0);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A ray intersects a sphere at a tangent", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 1, -5), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == 5.0);
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REQUIRE(xs[1].distance_t() == 5.0);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A ray misses a sphere", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 2, -5), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 0);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A originates inside a sphere", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, 0), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == -1.0);
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REQUIRE(xs[1].distance_t() == 1.0);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A sphere is behind a ray", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, 5), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == -6.0);
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REQUIRE(xs[1].distance_t() == -4.0);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Test Sphere Object", "[features/spheres.feature]")
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{
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Sphere s1;
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Sphere s2 = s1;
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Sphere s3;
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REQUIRE(s1 == s2);
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REQUIRE(s1 != s3);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("An intersection encapsulates t and object", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i(3.5, s);
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REQUIRE(i.distance_t() == 3.5);
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REQUIRE(i.object() == s);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Aggregating intersections", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i1(1, s);
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Intersection i2(2, s);
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Intersections xs = Intersections({i1, i2});
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == 1);
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REQUIRE(xs[1].distance_t() == 2);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersect sets the object on the intersection", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, 5), Tuple::Vector(0, 0, 1));
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Sphere s;
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].object() == s);
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REQUIRE(xs[1].object() == s);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The hit, when all intersections have positive t", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i1(1, s);
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Intersection i2(2, s);
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Intersections xs = Intersections({i2, i1});
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Intersection i = xs.hit();
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REQUIRE(i == i1);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The hit, when some intersections have negative t", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i1(-1, s);
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Intersection i2(1, s);
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Intersections xs = Intersections({i2, i1});
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Intersection i = xs.hit();
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REQUIRE(i == i2);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The hit, when all intersections have negative t", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i1(-2, s);
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Intersection i2(-1, s);
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Intersections xs = Intersections({i1, i2});
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auto i = xs.hit();
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// REQUIRE(i.has_value());
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The hit is always the lowest nonnegative intersection", "[features/intersections.feature]")
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{
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Sphere s;
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Intersection i1(5, s);
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Intersection i2(7, s);
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Intersection i3(-3, s);
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Intersection i4(2, s);
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Intersections xs = Intersections({i1, i2, i3, i4});
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Intersection i = xs.hit();
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REQUIRE(i == i4);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Translating a ray", "[features/rays.feature]")
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{
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Ray r(Tuple::Point(1, 2, 3), Tuple::Vector(0, 1, 0));
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Matrix m = Matrix::translation(3, 4, 5);
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Ray r2 = r.transform(m);
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REQUIRE(r2.origin() == Tuple::Point(4, 6, 8));
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REQUIRE(r2.direction() == Tuple::Vector(0, 1, 0));
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Scaling a ray", "[features/rays.feature]")
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{
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Ray r(Tuple::Point(1, 2, 3), Tuple::Vector(0, 1, 0));
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Matrix m = Matrix::scaling(2, 3, 4);
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Ray r2 = r.transform(m);
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REQUIRE(r2.origin() == Tuple::Point(2, 6, 12));
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REQUIRE(r2.direction() == Tuple::Vector(0, 3, 0));
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("A sphere's default transformation", "[features/spheres.feature]")
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{
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GIVEN("s <- Sphere()")
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{
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Sphere s;
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THEN("s.transform = identity_matrix")
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{
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REQUIRE(s.transform() == Matrix::identity());
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Changing a sphere's transformation", "[features/spheres.feature]")
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{
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Sphere s;
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Matrix t = Matrix::translation(2, 3, 4);
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s.set_transform(t);
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REQUIRE(s.transform() == t);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a scaled sphere with a ray", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
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Sphere s;
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s.set_transform(Matrix::scaling(2, 2, 2));
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 2);
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REQUIRE(xs[0].distance_t() == 3);
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REQUIRE(xs[1].distance_t() == 7);
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a translated sphere with a ray", "[features/spheres.feature]")
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{
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Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
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Sphere s;
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s.set_transform(Matrix::translation(5, 0, 0));
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Intersections xs = s.intersect(r);
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REQUIRE(xs.count() == 0);
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}
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