add cloth dragging test

examples/testbed/framework/test_entries.cpp

@@ -61,6 +61,7 @@
 #include <testbed/tests/cloth_test.h>
 #include <testbed/tests/spring_cloth_test.h>
 #include <testbed/tests/spring_cloth_collision_test.h>
+#include <testbed/tests/cloth_dragger.h>
 #include <testbed/tests/rope_test.h>
 //#include <testbed/tests/tree_test.h>
 #include <testbed/tests/implicit_spring.h>
@@ -110,6 +111,7 @@ TestEntry g_tests[] =
 	{ "Cloth", &Cloth::Create },
 	{ "Spring Cloth", &SpringCloth::Create },
 	{ "Spring Cloth Collision", &SpringClothCollision::Create },
+	{ "Spring Cloth Dragging", &ClothDraggerTest::Create },
 	{ "Rope", &Rope::Create },
 	//{ "Tree", &Tree::Create },
 	{ "Implicit Spring", &ImplicitSpring::Create },

examples/testbed/tests/cloth_dragger.h

@@ -0,0 +1,315 @@
+/*
+* Copyright (c) 2016-2016 Irlan Robson http://www.irlan.net
+*
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 1. The origin of this software must not be misrepresented; you must not
+* claim that you wrote the original software. If you use this software
+* in a product, an acknowledgment in the product documentation would be
+* appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef CLOTH_DRAGGER_TESH_H
+#define CLOTH_DRAGGER_TESH_H
+
+extern DebugDraw* g_debugDraw;
+extern Camera g_camera;
+extern Settings g_settings;
+
+class ClothDragger
+{
+public:
+	ClothDragger(Ray3* ray, b3SpringCloth* cloth)
+	{
+		m_ray = ray;
+		m_cloth = cloth;
+		m_isSelected = false;
+	}
+
+	~ClothDragger()
+	{
+
+	}
+
+	bool IsSelected() const
+	{
+		return m_isSelected;
+	}
+
+	b3Vec3 GetPointA() const
+	{
+		B3_ASSERT(m_isSelected);
+
+		b3Mesh* m = m_cloth->GetMesh();
+		b3Triangle* t = m->triangles + m_selection;
+
+		b3Vec3 A = m->vertices[t->v1];
+		b3Vec3 B = m->vertices[t->v2];
+		b3Vec3 C = m->vertices[t->v3];
+
+		return m_u * A + m_v * B + (1.0f - m_u - m_v) * C;
+	}
+
+	b3Vec3 GetPointB() const
+	{
+		B3_ASSERT(m_isSelected);
+		return m_ray->origin + m_x * (m_ray->B() - m_ray->A());
+	}
+
+	bool StartDragging()
+	{
+		B3_ASSERT(m_isSelected == false);
+
+		if (Select(m_selection, m_x) == false)
+		{
+			return false;
+		}
+
+		m_isSelected = true;
+
+		b3Mesh* m = m_cloth->GetMesh();
+		b3Triangle* t = m->triangles + m_selection;
+
+		m_cloth->SetType(t->v1, e_staticMass);
+		m_cloth->SetType(t->v2, e_staticMass);
+		m_cloth->SetType(t->v3, e_staticMass);
+
+		b3Vec3 v1 = m_cloth->GetPosition(t->v1);
+		b3Vec3 v2 = m_cloth->GetPosition(t->v2);
+		b3Vec3 v3 = m_cloth->GetPosition(t->v3);
+
+		b3Vec3 B = GetPointB();
+
+		float32 wABC[4];
+		b3BarycentricCoordinates(wABC, v1, v2, v3, B);
+
+		if (wABC[3] > B3_EPSILON)
+		{
+			m_u = wABC[0] / wABC[3];
+			m_v = wABC[1] / wABC[3];
+		}
+		else
+		{
+			m_u = m_v = 0.0f;
+		}
+
+		return true;
+	}
+
+	void Drag()
+	{
+		B3_ASSERT(m_isSelected);
+
+		b3Mesh* m = m_cloth->GetMesh();
+		b3Triangle* t = m->triangles + m_selection;
+
+		b3Vec3 A = GetPointA();
+		b3Vec3 B = GetPointB();
+
+		b3Vec3 dx = B - A;
+
+		b3Vec3 v1 = m_cloth->GetPosition(t->v1);
+		v1 += dx;
+		m_cloth->SetPosition(t->v1, v1);
+
+		b3Vec3 v2 = m_cloth->GetPosition(t->v2);
+		v2 += dx;
+		m_cloth->SetPosition(t->v2, v2);
+
+		b3Vec3 v3 = m_cloth->GetPosition(t->v3);
+		v3 += dx;
+		m_cloth->SetPosition(t->v3, v3);
+	}
+
+	void StopDragging()
+	{
+		B3_ASSERT(m_isSelected);
+
+		m_isSelected = false;
+
+		b3Mesh* m = m_cloth->GetMesh();
+		b3Triangle* t = m->triangles + m_selection;
+
+		m_cloth->SetType(t->v1, e_dynamicMass);
+		m_cloth->SetType(t->v2, e_dynamicMass);
+		m_cloth->SetType(t->v3, e_dynamicMass);
+	}
+
+private:
+
+	bool Select(u32& selection, float32& fraction) const
+	{
+		b3Mesh* m = m_cloth->GetMesh();
+
+		b3MeshShape ms;
+		ms.m_mesh = m;
+
+		b3RayCastInput input;
+		input.p1 = m_ray->A();
+		input.p2 = m_ray->B();
+		input.maxFraction = m_ray->fraction;
+
+		b3Transform transform;
+		transform.SetIdentity();
+
+		float32 minFraction = B3_MAX_FLOAT;
+		b3Vec3 minNormal(0.0f, 0.0f, 0.0f);
+		u32 minIndex = ~0;
+
+		for (u32 i = 0; i < m->triangleCount; ++i)
+		{
+			b3RayCastOutput subOutput;
+			if (ms.RayCast(&subOutput, input, transform, i) == true)
+			{
+				if (subOutput.fraction < minFraction)
+				{
+					minFraction = subOutput.fraction;
+					minNormal = subOutput.normal;
+					minIndex = i;
+				}
+			}
+		}
+
+		if (minIndex != ~0)
+		{
+			selection = minIndex;
+			fraction = minFraction;
+			return true;
+		}
+
+		return false;
+	}
+
+	bool m_isSelected;
+
+	Ray3* m_ray;
+	float32 m_x;
+
+	b3SpringCloth * m_cloth;
+	u32 m_selection;
+	float32 m_u, m_v;
+};
+
+class ClothDraggerTest : public Test
+{
+public:
+	ClothDraggerTest() : m_clothDragger(&m_clothRay, &m_cloth)
+	{
+		g_camera.m_zoom = 25.0f;
+
+		b3SpringClothDef def;
+		def.allocator = &m_clothAllocator;
+		def.mesh = m_meshes + e_clothMesh;
+		def.density = 0.2f;
+		def.ks = 10000.0f;
+		def.r = 0.2f;
+		def.gravity.Set(0.0f, -10.0f, 0.0f);
+
+		m_cloth.Initialize(def);
+
+		m_clothCapsule.m_centers[0].Set(0.0f, -2.0f, 2.0f);
+		m_clothCapsule.m_centers[1].Set(0.0f, -2.0f, -2.0f);
+		m_clothCapsule.m_radius = 2.0f;
+
+		m_clothCapsule.SetFriction(1.0f);
+
+		m_cloth.AddShape(&m_clothCapsule);
+
+		m_clothRay.origin.SetZero();
+		m_clothRay.direction.Set(0.0f, 0.0f, -1.0f);
+		m_clothRay.fraction = g_camera.m_zFar;
+	}
+
+	void Step()
+	{
+		float32 dt = g_settings.hertz > 0.0f ? 1.0f / g_settings.hertz : 0.0f;
+
+		if (g_settings.pause)
+		{
+			if (g_settings.singleStep)
+			{
+				g_settings.singleStep = false;
+			}
+			else
+			{
+				dt = 0.0f;
+			}
+		}
+
+		m_cloth.Step(dt);
+
+		m_cloth.Apply();
+
+		b3Shape** shapes = m_cloth.GetShapes();
+		for (u32 i = 0; i < m_cloth.GetShapeCount(); ++i)
+		{
+			b3Shape* s = shapes[i];
+
+			b3Transform xf;
+			xf.SetIdentity();
+
+			g_debugDraw->DrawShape(s, b3Color_white, xf);
+		}
+
+		m_cloth.Draw(g_debugDraw);
+
+		b3SpringClothStep step = m_cloth.GetStep();
+
+		char text[256];
+		sprintf(text, "Iterations = %u", step.iterations);
+		g_debugDraw->DrawString(text, b3Color_white);
+
+		if (m_clothDragger.IsSelected() == true)
+		{
+			g_debugDraw->DrawSegment(m_clothDragger.GetPointA(), m_clothDragger.GetPointB(), b3Color_white);
+		}
+	}
+
+	void MouseMove(const Ray3& pw)
+	{
+		m_clothRay = pw;
+
+		if (m_clothDragger.IsSelected() == true)
+		{
+			m_clothDragger.Drag();
+		}
+	}
+
+	void MouseLeftDown(const Ray3& pw)
+	{
+		if (m_clothDragger.IsSelected() == false)
+		{
+			m_clothDragger.StartDragging();
+		}
+	}
+
+	void MouseLeftUp(const Ray3& pw)
+	{
+		if (m_clothDragger.IsSelected() == true)
+		{
+			m_clothDragger.StopDragging();
+		}
+	}
+
+	static Test* Create()
+	{
+		return new ClothDraggerTest();
+	}
+
+	Ray3 m_clothRay;
+
+	b3StackAllocator m_clothAllocator;
+	b3SpringCloth m_cloth;
+	b3CapsuleShape m_clothCapsule;
+
+	ClothDragger m_clothDragger;
+};
+
+#endif