105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/*!
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* 04_transformations.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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TEST_CASE("[04][TRANSFORMATION] Multiplying by a translation matrix", "[Matrix]")
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{
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Matrix transform = Matrix::translation(5, -3, 2);
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Tuple p = Tuple::Point(-3, 4, 5);
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REQUIRE(transform * p == Tuple::Point(2, 1, 7));
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] Multiplying by the inverse of a translation matrix", "[Matrix]")
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{
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Matrix transform = Matrix::translation(5, -3, 2);
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Matrix inv = transform.inverse();
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Tuple p = Tuple::Point(-3, 4, 5);
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REQUIRE(inv * p == Tuple::Point(-8, 7, 3));
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] Translation does not affect vectors", "[Matrix]")
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{
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Matrix transform = Matrix::translation(5, -3, 2);
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Tuple v = Tuple::Vector(-3, 4, 5);
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REQUIRE(transform * v == v);
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] A scaling matrix applied to a point", "[Matrix]")
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{
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Matrix transform = Matrix::scaling(2, 3, 4);
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Tuple p = Tuple::Point(-4, 6, 8);
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REQUIRE(transform * p == Tuple::Point(-8, 18, 32));
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] A scaling matrix applied to a vector", "[Matrix]")
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{
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Matrix transform = Matrix::scaling(2, 3, 4);
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Tuple v = Tuple::Vector(-4, 6, 8);
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REQUIRE(transform * v == Tuple::Vector(-8, 18, 32));
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] Multiplying by the inverse of a scaling matrix", "[Matrix]")
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{
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Matrix transform = Matrix::scaling(2, 3, 4);
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Matrix inv = transform.inverse();
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Tuple v = Tuple::Vector(-4, 6, 8);
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REQUIRE(inv * v == Tuple::Vector(-2, 2, 2));
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}
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/* ------------------------------------------------------------------------- */
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TEST_CASE("[04][TRANSFORMATION] Reflection is scaling by a negative value", "[Matrix]")
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{
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Matrix transform = Matrix::scaling(-1, 1, 1);
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Tuple p = Tuple::Point(2, 3, 4);
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REQUIRE(transform * p == Tuple::Point(-2, 3, 4));
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}
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