365 lines
12 KiB
C++
365 lines
12 KiB
C++
/*!
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* 13_cylinders.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: 18/03/2024
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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 CylinderTestIntersect
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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 t0 = -1;
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double t1 = -1;
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};
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/* ------------------------------------------------------------------------- */
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class CylinderTestNormal
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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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class CylinderTestConstrained
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{
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public:
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Tuple point;
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Tuple direction;
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uint16_t count;
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};
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/* ------------------------------------------------------------------------- */
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SCENARIO("A Ray misses a cylinder", "[features/cylinders.feature]")
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{
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// | origin | direction |
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// | point(1, 0, 0) | vector(0, 1, 0) |
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// | point(0, 0, 0) | vector(0, 1, 0) |
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// | point(0, 0, -5) | vector(1, 1, 1) |
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CylinderTestIntersect the_test[] = {
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{Tuple::Point(1, 0, 0), Tuple::Vector(0, 1, 0)},
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{Tuple::Point(0, 0, 0), Tuple::Vector(0, 1, 0)},
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{Tuple::Point(0, 0, -5), Tuple::Vector(1, 1, 1)}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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AND_GIVEN("r <- ray(<origin>, <direction>)")
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{
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WHEN("xs <- local_intersect(cyl,r)")
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{
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for (int i = 0; i < 3; 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 = cyl.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("A Ray strikes a cylinder", "[features/cylinders.feature]")
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{
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// | origin | direction | t0 | t1 |
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// | point(1, 0, -5) | vector(0, 0, 1) | 5 | 5 |
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// | point(0, 0, -5) | vector(0, 0, 1) | 4 | 6 |
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// | point(0.5, 0, -5) | vector(0.1, 1, 1) | 6.80798 | 7.08872 |
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CylinderTestIntersect the_test[] = {
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{ Tuple::Point(1, 0, -5), Tuple::Vector(0, 0, 1), 5, 5},
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{ Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1), 4, 6},
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{Tuple::Point(0.5, 0, -5), Tuple::Vector(0.1, 1, 1), 6.80798, 7.08872}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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AND_GIVEN("direction <- normalize(<direction>)")
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{
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AND_GIVEN("r <- ray(<origin>, direction)")
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{
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WHEN("xs <- local_intersect(cyl,r)")
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{
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for (int i = 0; i < 3; i++)
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{
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Tuple direction = the_test[i].direction.normalize();
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Ray r(the_test[i].origin, direction);
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Intersections xs = cyl.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].t0);
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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].t1);
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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("Normal vector on a cylinder", "[features/cylinders.feature]")
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{
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// | point | normal |
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// | point(1, 0, 0) | vector(1, 0, 0) |
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// | point(0, 5, -1) | vector(0, 0, -1) |
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// | point(0, -2, 1) | vector(0, 0, 1) |
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// | point(-1, 1, 0) | vector(-1, 0, 0) |
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CylinderTestNormal the_test[] = {
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{ Tuple::Point(1, 0, 0), Tuple::Vector(1, 0, 0)},
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{ Tuple::Point(0, 5, -1), Tuple::Vector(0, 0, -1)},
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{ Tuple::Point(0, -2, 1), Tuple::Vector(0, 0, 1)},
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{Tuple::Point(-1, 1, 0), Tuple::Vector(-1, 0, 0)}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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WHEN("n <- local_normal_at(cyl,<point>)")
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{
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for (int i = 0; i < 3; i++)
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{
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Tuple p = the_test[i].point;
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Tuple normal = cyl.local_normal_at(p);
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THEN("n = <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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SCENARIO("The default minimum and maximum for a cylinder", "[features/cylinders.feature]")
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{
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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THEN("cym.minimum = -infinity")
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{
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REQUIRE(cyl.minimum() == -std::numeric_limits<double>::infinity());
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}
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AND_THEN("cym.maximum = infinity")
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{
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REQUIRE(cyl.maximum() == std::numeric_limits<double>::infinity());
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting a constrained cylinder", "[features/cylinders.feature]")
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{
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// | | point | direction | count |
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// | 1 | point(0, 1.5, 0) | vector(0.1, 1, 0) | 0 |
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// | 2 | point(0, 3, -5) | vector(0, 0, 1) | 0 |
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// | 3 | point(0, 0, -5) | vector(0, 0, 1) | 0 |
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// | 4 | point(0, 2, -5) | vector(0, 0, 1) | 0 |
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// | 5 | point(0, 1, -5) | vector(0, 0, 1) | 0 |
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// | 6 | point(0, 1.5, -2) | vector(0, 0, 1) | 2 |
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CylinderTestConstrained the_test[] = {
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{Tuple::Point(0, 1.5, 0), Tuple::Vector(0.1, 1, 0), 0},
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{Tuple::Point(0, 3, -5), Tuple::Vector(0, 0, 1), 0},
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{Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1), 0},
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{Tuple::Point(0, 2, -5), Tuple::Vector(0, 0, 1), 0},
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{Tuple::Point(0, 1, -5), Tuple::Vector(0, 0, 1), 0},
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{Tuple::Point(0, 1.5, -20), Tuple::Vector(0, 0, 1), 2}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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AND_GIVEN("cyl.minimum <- 1")
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{
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cyl.set_minimum(1);
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AND_GIVEN("cyl.maximum <- 2")
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{
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cyl.set_maximum(2);
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AND_GIVEN("direction <- normalize(<direction>)")
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{
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AND_GIVEN("r <- ray(<point>, direction)")
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{
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WHEN("xs <- local_intersect(cyl,r)")
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{
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for (int i = 0; i < 6; i++)
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{
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Tuple direction = the_test[i].direction.normalize();
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Ray r(the_test[i].point, direction);
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Intersections xs = cyl.local_intersect(r);
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THEN("xs.count = <count>")
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{
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REQUIRE(xs.count() == the_test[i].count);
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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 default closed value for a cylinder", "[features/cylinders.feature]")
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{
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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THEN("cyl.closed = false")
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{
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REQUIRE(cyl.closed() == false);
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Intersecting the caps of a closed cylinder", "[features/cylinders.feature]")
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{
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// | | point | direction | count |
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// | 1 | point(0, 3, 0) | vector(0, -1, 0) | 2 |
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// | 2 | point(0, 3, -2) | vector(0, -1, 2) | 2 |
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// | 3 | point(0, 4, -2) | vector(0, -1, 1) | 2 | # corner case
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// | 4 | point(0, 0, -2) | vector(0, 1, 2) | 2 |
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// | 5 | point(0, -1, -2) | vector(0, 1, 1) | 2 | # corner case
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CylinderTestConstrained the_test[] = {
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{Tuple::Point(0, 3, 0), Tuple::Vector(0, -1, 0), 2},
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{Tuple::Point(0, 3, -2), Tuple::Vector(0, -1, 2), 2},
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{Tuple::Point(0, 4, -2), Tuple::Vector(0, -1, 1), 2},
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{Tuple::Point(0, 0, -2), Tuple::Vector(0, 1, 2), 2},
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{Tuple::Point(0, -1, -2), Tuple::Vector(0, 1, 1), 2}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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AND_GIVEN("cyl.minimum <- 1")
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{
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cyl.set_minimum(1);
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AND_GIVEN("cyl.maximum <- 2")
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{
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cyl.set_maximum(2);
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AND_GIVEN("cyl.closed <- true")
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{
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cyl.set_closed(true);
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AND_GIVEN("direction <- normalize(<direction>)")
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{
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AND_GIVEN("r <- ray(<point>, direction)")
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{
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WHEN("xs <- local_intersect(cyl,r)")
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{
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for (int i = 0; i < 5; i++)
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{
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Tuple direction = the_test[i].direction.normalize();
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Ray r(the_test[i].point, direction);
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Intersections xs = cyl.local_intersect(r);
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THEN("xs.count = <count>")
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{
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REQUIRE(xs.count() == the_test[i].count);
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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("The normal vector on the cylinder's end caps", "[features/cylinders.feature]")
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{
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// | point | normal |
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// | point(0, 1, 0) | vector(0, -1, 0) |
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// | point(0.5, 1, 0) | vector(0, -1, 0) |
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// | point(0, 1, 0.5) | vector(0, -1, 0) |
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// | point(0, 2, 0) | vector(0, 1, 0) |
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// | point(0.5, 2, 0) | vector(0, 1, 0) |
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// | point(0, 2, 0.5) | vector(0, 1, 0) |
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CylinderTestNormal the_test[] = {
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{ Tuple::Point(0, 1, 0), Tuple::Vector(0, -1, 0)},
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{Tuple::Point(0.5, 1, 0), Tuple::Vector(0, -1, 0)},
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{ Tuple::Point(0, 1, 0.5), Tuple::Vector(0, -1, 0)},
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{ Tuple::Point(0, 2, 0), Tuple::Vector(0, 1, 0)},
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{Tuple::Point(0.5, 2, 0), Tuple::Vector(0, 1, 0)},
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{ Tuple::Point(0, 2, 0.5), Tuple::Vector(0, 1, 0)}
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};
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GIVEN("cyl <- cylinder()")
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{
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Cylinder cyl;
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AND_GIVEN("cyl.minimum <- 1")
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{
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cyl.set_minimum(1);
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AND_GIVEN("cyl.maximum <- 2")
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{
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cyl.set_maximum(2);
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AND_GIVEN("cyl.closed <- true")
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{
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cyl.set_closed(true);
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WHEN("n <- local_normal_at(cyl,<point>)")
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{
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for (int i = 0; i < 6; i++)
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{
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Tuple p = the_test[i].point;
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Tuple normal = cyl.local_normal_at(p);
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THEN("n = <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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}
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}
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