144 lines
3.3 KiB
C++
144 lines
3.3 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 TENSION_MAPPING_H
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#define TENSION_MAPPING_H
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// Hot/Cold color map
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// See http://paulbourke.net/miscellaneous/colourspace/
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static inline b3Color Color(float32 x, float32 a, float32 b)
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{
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x = b3Clamp(x, a, b);
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float32 d = b - a;
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b3Color c(1.0f, 1.0f, 1.0f);
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if (x < a + 0.25f * d)
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{
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c.r = 0.0f;
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c.g = 4.0f * (x - a) / d;
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return c;
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}
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if (x < a + 0.5f * d)
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{
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c.r = 0.0f;
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c.b = 1.0f + 4.0f * (a + 0.25f * d - x) / d;
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return c;
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}
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if (x < a + 0.75f * d)
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{
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c.r = 4.0f * (x - a - 0.5f * d) / d;
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c.b = 0.0f;
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return c;
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}
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c.g = 1.0f + 4.0f * (a + 0.75f * d - x) / d;
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c.b = 0.0f;
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return c;
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}
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class TensionMapping : public SpringClothTest
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{
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public:
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TensionMapping()
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{
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b3SpringClothDef def;
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def.allocator = &m_clothAllocator;
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def.mesh = &m_clothMesh;
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def.density = 0.2f;
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def.ks = 100000.0f;
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def.gravity.Set(0.0f, -10.0f, 0.0f);
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m_cloth.Initialize(def);
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b3AABB3 aabb;
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aabb.m_lower.Set(-5.0f, -1.0f, -6.0f);
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aabb.m_upper.Set(5.0f, 1.0f, -4.0f);
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for (u32 i = 0; i < def.mesh->vertexCount; ++i)
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{
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if (aabb.Contains(def.mesh->vertices[i]))
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{
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m_cloth.SetType(i, b3MassType::e_staticMass);
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}
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}
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}
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void Step()
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{
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float32 dt = g_testSettings->inv_hertz;
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m_cloth.Step(dt);
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m_cloth.Apply();
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b3StackArray<b3Vec3, 100> T;
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m_cloth.GetTension(T);
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for (u32 i = 0; i < m_clothMesh.triangleCount; ++i)
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{
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b3Triangle* t = m_clothMesh.triangles + i;
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const float32 kMaxT = 100000.0f;
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b3Vec3 f1 = T[t->v1];
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float32 L1 = b3Length(f1);
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b3Color c1 = Color(L1, 0.0f, kMaxT);
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b3Vec3 f2 = T[t->v2];
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float32 L2 = b3Length(f2);
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b3Color c2 = Color(L2, 0.0f, kMaxT);
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b3Vec3 f3 = T[t->v3];
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float32 L3 = b3Length(f3);
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b3Color c3 = Color(L3, 0.0f, kMaxT);
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b3Vec3 v1 = m_clothMesh.vertices[t->v1];
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b3Vec3 v2 = m_clothMesh.vertices[t->v2];
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b3Vec3 v3 = m_clothMesh.vertices[t->v3];
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b3Vec3 n1 = b3Cross(v2 - v1, v3 - v1);
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n1.Normalize();
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b3Vec3 n2 = -n1;
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g_draw->DrawSolidTriangle(n1, v1, c1, v2, c2, v3, c3);
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g_draw->DrawSolidTriangle(n2, v1, c1, v3, c3, v2, c2);
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}
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b3SpringClothStep step = m_cloth.GetStep();
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g_draw->DrawString(b3Color_white, "Iterations = %u", step.iterations);
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if (m_clothDragger.IsSelected() == true)
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{
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g_draw->DrawSegment(m_clothDragger.GetPointA(), m_clothDragger.GetPointB(), b3Color_white);
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}
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}
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static Test* Create()
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{
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return new TensionMapping();
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}
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b3GridMesh<10, 10> m_clothMesh;
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};
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#endif |