vladislavbelov
d1fb66d2a7
Reviewed By: wraitii Differential Revision: https://code.wildfiregames.com/D1951 This was SVN commit r22372.
212 lines
6.9 KiB
C++
212 lines
6.9 KiB
C++
/* Copyright (C) 2019 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "lib/self_test.h"
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#include "lib/posix/posix.h"
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#include "maths/BoundingBoxAligned.h"
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#include "maths/BoundingBoxOriented.h"
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#include "maths/Matrix3D.h"
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#define TS_ASSERT_VEC_DELTA(v, x, y, z, delta) \
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TS_ASSERT_DELTA(v.X, x, delta); \
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TS_ASSERT_DELTA(v.Y, y, delta); \
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TS_ASSERT_DELTA(v.Z, z, delta);
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class TestBound : public CxxTest::TestSuite
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{
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public:
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void setUp()
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{
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CxxTest::setAbortTestOnFail(true);
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}
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void test_empty_aabb()
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{
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CBoundingBoxAligned bound;
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TS_ASSERT(bound.IsEmpty());
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bound += CVector3D(1, 2, 3);
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TS_ASSERT(! bound.IsEmpty());
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bound.SetEmpty();
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TS_ASSERT(bound.IsEmpty());
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}
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void test_empty_obb()
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{
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CBoundingBoxOriented bound;
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TS_ASSERT(bound.IsEmpty());
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bound.m_Basis[0] = CVector3D(1,0,0);
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bound.m_Basis[1] = CVector3D(0,1,0);
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bound.m_Basis[2] = CVector3D(0,0,1);
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bound.m_HalfSizes = CVector3D(1,2,3);
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TS_ASSERT(!bound.IsEmpty());
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bound.SetEmpty();
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TS_ASSERT(bound.IsEmpty());
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}
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void test_extend_vector()
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{
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CBoundingBoxAligned bound;
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CVector3D v (1, 2, 3);
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bound += v;
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CVector3D center;
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bound.GetCenter(center);
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TS_ASSERT_EQUALS(center, v);
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}
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void test_extend_bound()
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{
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CBoundingBoxAligned bound;
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CVector3D v (1, 2, 3);
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CBoundingBoxAligned b (v, v);
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bound += b;
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CVector3D center;
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bound.GetCenter(center);
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TS_ASSERT_EQUALS(center, v);
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}
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void test_aabb_to_obb_translation()
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{
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CBoundingBoxAligned aabb(CVector3D(-1,-2,-1), CVector3D(1,2,1));
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CMatrix3D translation;
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translation.SetTranslation(CVector3D(1,3,7));
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CBoundingBoxOriented result;
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aabb.Transform(translation, result);
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TS_ASSERT_VEC_DELTA(result.m_Center, 1.f, 3.f, 7.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[0], 1.f, 0.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[1], 0.f, 1.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[2], 0.f, 0.f, 1.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_HalfSizes, 1.f, 2.f, 1.f, 1e-7f);
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}
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void test_aabb_to_obb_rotation_around_origin()
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{
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// rotate a 4x3x3 AABB centered at (5,0,0) 90 degrees CCW around the Z axis, and verify that the
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// resulting OBB is correct
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CBoundingBoxAligned aabb(CVector3D(3, -1.5f, -1.5f), CVector3D(7, 1.5f, 1.5f));
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CMatrix3D rotation;
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rotation.SetZRotation(float(M_PI)/2.f);
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CBoundingBoxOriented result;
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aabb.Transform(rotation, result);
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TS_ASSERT_VEC_DELTA(result.m_Center, 0.f, 5.f, 0.f, 1e-6f); // involves some trigonometry, lower precision
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TS_ASSERT_VEC_DELTA(result.m_Basis[0], 0.f, 1.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[1], -1.f, 0.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[2], 0.f, 0.f, 1.f, 1e-7f);
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}
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void test_aabb_to_obb_rotation_around_point()
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{
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// rotate a 4x3x3 AABB centered at (5,0,0) 45 degrees CW around the Z axis through (2,0,0)
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CBoundingBoxAligned aabb(CVector3D(3, -1.5f, -1.5f), CVector3D(7, 1.5f, 1.5f));
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// move everything so (2,0,0) becomes the origin, do the rotation, then move everything back
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CMatrix3D translate;
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CMatrix3D rotate;
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CMatrix3D translateBack;
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translate.SetTranslation(-2.f, 0, 0);
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rotate.SetZRotation(-float(M_PI)/4.f);
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translateBack.SetTranslation(2.f, 0, 0);
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CMatrix3D transform;
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transform.SetIdentity();
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transform.Concatenate(translate);
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transform.Concatenate(rotate);
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transform.Concatenate(translateBack);
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CBoundingBoxOriented result;
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aabb.Transform(transform, result);
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const float invSqrt2 = 1.f/sqrtf(2.f);
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TS_ASSERT_VEC_DELTA(result.m_Center, 3*invSqrt2 + 2, -3*invSqrt2, 0.f, 1e-6f); // involves some trigonometry, lower precision
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TS_ASSERT_VEC_DELTA(result.m_Basis[0], invSqrt2, -invSqrt2, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[1], invSqrt2, invSqrt2, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[2], 0.f, 0.f, 1.f, 1e-7f);
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}
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void test_aabb_to_obb_scale()
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{
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CBoundingBoxAligned aabb(CVector3D(3, -1.5f, -1.5f), CVector3D(7, 1.5f, 1.5f));
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CMatrix3D scale;
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scale.SetScaling(1.f, 3.f, 7.f);
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CBoundingBoxOriented result;
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aabb.Transform(scale, result);
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TS_ASSERT_VEC_DELTA(result.m_Center, 5.f, 0.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_HalfSizes, 2.f, 4.5f, 10.5f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[0], 1.f, 0.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[1], 0.f, 1.f, 0.f, 1e-7f);
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TS_ASSERT_VEC_DELTA(result.m_Basis[2], 0.f, 0.f, 1.f, 1e-7f);
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}
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// Verify that ray/OBB intersection is correctly determined in degenerate case where the
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// box has zero size in one of its dimensions.
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void test_degenerate_obb_ray_intersect()
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{
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// create OBB of a flat 1x1 square in the X/Z plane, with 0 size in the Y dimension
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CBoundingBoxOriented bound;
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bound.m_Basis[0] = CVector3D(1,0,0); // X
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bound.m_Basis[1] = CVector3D(0,1,0); // Y
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bound.m_Basis[2] = CVector3D(0,0,1); // Z
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bound.m_HalfSizes[0] = 1.f;
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bound.m_HalfSizes[1] = 0.f; // no height, i.e. a "flat" OBB
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bound.m_HalfSizes[2] = 1.f;
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bound.m_Center = CVector3D(0,0,0);
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// create two rays; one that should hit the OBB, and one that should miss it
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CVector3D ray1origin(-3.5f, 3.f, 0.f);
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CVector3D ray1direction(1.f, -1.f, 0.f);
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CVector3D ray2origin(-4.5f, 3.f, 0.f);
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CVector3D ray2direction(1.f, -1.f, 0.f);
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float tMin, tMax;
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TSM_ASSERT("Ray 1 should intersect the OBB", bound.RayIntersect(ray1origin, ray1direction, tMin, tMax));
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TSM_ASSERT("Ray 2 should not intersect the OBB", !bound.RayIntersect(ray2origin, ray2direction, tMin, tMax));
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}
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// Verify that transforming a flat AABB to an OBB does not produce NaN basis vectors in the
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// resulting OBB (see http://trac.wildfiregames.com/ticket/1121)
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void test_degenerate_aabb_to_obb_transform()
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{
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// create a flat AABB, transform it with some matrix (can even be the identity matrix),
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// and verify that the result does not contain any NaN values in its basis vectors
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// and/or half-sizes
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CBoundingBoxAligned flatAabb(CVector3D(-1,0,-1), CVector3D(1,0,1));
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CMatrix3D transform;
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transform.SetIdentity();
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CBoundingBoxOriented result;
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flatAabb.Transform(transform, result);
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TS_ASSERT(!isnan(result.m_Basis[0].X) && !isnan(result.m_Basis[0].Y) && !isnan(result.m_Basis[0].Z));
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TS_ASSERT(!isnan(result.m_Basis[1].X) && !isnan(result.m_Basis[1].Y) && !isnan(result.m_Basis[1].Z));
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TS_ASSERT(!isnan(result.m_Basis[2].X) && !isnan(result.m_Basis[2].Y) && !isnan(result.m_Basis[2].Z));
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}
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};
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