112 lines
2.4 KiB
C++
112 lines
2.4 KiB
C++
/*
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* Copyright (c) 2016-2016 Irlan Robson http://www.irlan.net
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef CONVEX_HULL_H
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#define CONVEX_HULL_H
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class ConvexHull : public Test
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{
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public:
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enum
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{
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// Half to avoid generation failure due to many vertices
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e_count = B3_MAX_HULL_VERTICES / 2
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};
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ConvexHull()
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{
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b3BoxHull box;
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box.SetIdentity();
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b3Vec3 tetra[4];
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b3Vec3 v1(-1.0f, 0.0f, 0.0f);
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b3Vec3 v2(1.0f, 0.0f, 0.0f);
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b3Vec3 v3(0.0f, 0.0f, -1.0f);
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b3Vec3 v4 = 0.5f * (v1 + v2 + v3);
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v4.y += 2.0f;
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tetra[0] = v1;
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tetra[1] = v2;
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tetra[2] = v3;
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tetra[3] = v4;
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// Minkowski sum of box and tetrahedron
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m_count = 0;
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for (u32 i = 0; i < box.vertexCount; ++i)
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{
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for (u32 j = 0; j < 4; ++j)
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{
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b3Vec3 p = box.vertices[i] - tetra[j];
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m_points[m_count++] = p;
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}
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}
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}
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~ConvexHull()
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{
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}
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void KeyDown(int button)
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{
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if (button == GLFW_KEY_G)
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{
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Generate();
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}
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}
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void Generate()
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{
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m_count = 0;
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for (u32 i = 0; i < e_count; ++i)
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{
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// Clamp to force coplanarities.
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// This will stress the generation code.
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float32 x = 3.0f * RandomFloat(-1.0f, 1.0f);
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float32 y = 3.0f * RandomFloat(-1.0f, 1.0f);
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float32 z = 3.0f * RandomFloat(-1.0f, 1.0f);
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b3Vec3 p(x, y, z);
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m_points[m_count++] = p;
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}
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}
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void Step()
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{
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b3QHull hull;
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hull.Set(m_points, m_count);
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b3HullShape shape;
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shape.m_hull = &hull;
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g_draw->DrawSolidShape(&shape, b3Color_white, b3Transform_identity);
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g_draw->DrawString(b3Color_white, "G - Generate a random convex hull");
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}
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static Test* Create()
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{
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return new ConvexHull();
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}
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u32 m_count;
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b3Vec3 m_points[e_count];
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};
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#endif |