New feature: soft bodies!

examples/testbed/framework/softbody_dragger.h

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+/*
+* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
+*
+* 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 B3_SOFTBODY_DRAGGER_H
+#define B3_SOFTBODY_DRAGGER_H
+
+#include <bounce/common/geometry.h>
+#include <bounce/softbody/softbody.h>
+#include <bounce/softbody/softbody_mesh.h>
+#include <bounce/softbody/softbody_node.h>
+
+// A soft body triangle dragger.
+class b3SoftBodyDragger
+{
+public:
+	b3SoftBodyDragger(b3Ray3* ray, b3SoftBody* body);
+	~b3SoftBodyDragger();
+
+	bool IsDragging() const;
+
+	bool StartDragging();
+
+	void Drag();
+
+	void StopDragging();
+
+	b3Vec3 GetPointA() const;
+
+	b3Vec3 GetPointB() const;
+private:
+	b3Ray3* m_ray;
+	float32 m_x;
+
+	b3SoftBody* m_body;
+	const b3SoftBodyMesh* m_mesh;
+	const b3SoftBodyMeshTetrahedron* m_tetrahedron;
+	u32 m_v1, m_v2, m_v3, m_v4;
+	float32 m_tu, m_tv, m_tw, m_tx;
+};
+
+inline bool b3SoftBodyDragger::IsDragging() const
+{
+	return m_tetrahedron != nullptr;
+}
+
+#endif