CollisionDetectionAlgorithm.h

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#ifndef SimTK_SIMMATH_COLLISION_DETECTION_ALGORITHM_H_
#define SimTK_SIMMATH_COLLISION_DETECTION_ALGORITHM_H_

/* -------------------------------------------------------------------------- *
 *                        Simbody(tm): SimTKmath                              *
 * -------------------------------------------------------------------------- *
 * This is part of the SimTK biosimulation toolkit originating from           *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org/home/simbody.  *
 *                                                                            *
 * Portions copyright (c) 2008-12 Stanford University and the Authors.        *
 * Authors: Peter Eastman                                                     *
 * Contributors:                                                              *
 *                                                                            *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may    *
 * not use this file except in compliance with the License. You may obtain a  *
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0.         *
 *                                                                            *
 * Unless required by applicable law or agreed to in writing, software        *
 * distributed under the License is distributed on an "AS IS" BASIS,          *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *
 * See the License for the specific language governing permissions and        *
 * limitations under the License.                                             *
 * -------------------------------------------------------------------------- */

#include "SimTKcommon.h"
#include "simmath/internal/common.h"
#include "simmath/internal/ContactGeometry.h"
#include "simmath/internal/Contact.h"

#include <map>

namespace SimTK {

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm {
public:
    class HalfSpaceSphere;
    class SphereSphere;
    class HalfSpaceEllipsoid;
    class HalfSpaceTriangleMesh;
    class SphereTriangleMesh;
    class TriangleMeshTriangleMesh;
    class ConvexConvex;
    virtual ~CollisionDetectionAlgorithm() {}
    virtual void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const = 0;
    static void registerAlgorithm(ContactGeometryTypeId type1, 
                                  ContactGeometryTypeId type2, 
                                  CollisionDetectionAlgorithm* algorithm);
    static CollisionDetectionAlgorithm* 
        getAlgorithm(ContactGeometryTypeId type1, ContactGeometryTypeId type2);
private:
    struct AlgorithmMap 
    :   public std::map<std::pair<ContactGeometryTypeId, ContactGeometryTypeId>, 
                        CollisionDetectionAlgorithm*> 
    {
        ~AlgorithmMap();
    };

    static AlgorithmMap algorithmMap;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::HalfSpaceSphere 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~HalfSpaceSphere() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::HalfSpaceEllipsoid 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~HalfSpaceEllipsoid() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1,
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2,
        const Transform& transform2,
        Array_<Contact>& contacts) const;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::SphereSphere 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~SphereSphere() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::HalfSpaceTriangleMesh 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~HalfSpaceTriangleMesh() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const;
private:
    void processBox(const ContactGeometry::TriangleMesh& mesh, 
                    const ContactGeometry::TriangleMesh::OBBTreeNode& node,
                    const Transform& transform, const Vec3& axisDir, 
                    Real xoffset, std::set<int>& insideFaces) const;
    void addAllTriangles(const ContactGeometry::TriangleMesh::OBBTreeNode& node,
                         std::set<int>& insideFaces) const;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::SphereTriangleMesh 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~SphereTriangleMesh() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const;
private:
    void processBox(const Vec3& center, Real radius2, 
                    const ContactGeometry::TriangleMesh& mesh, 
                    const ContactGeometry::TriangleMesh::OBBTreeNode& node,
                    std::set<int>& insideFaces) const;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::TriangleMeshTriangleMesh
:   public CollisionDetectionAlgorithm {
public:
    virtual ~TriangleMeshTriangleMesh() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1, 
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2, 
        const Transform& transform2, 
        Array_<Contact>& contacts) const;
private:
    void processNodes(const ContactGeometry::TriangleMesh& mesh1, 
                      const ContactGeometry::TriangleMesh& mesh2,
                      const ContactGeometry::TriangleMesh::OBBTreeNode& node1, 
                      const ContactGeometry::TriangleMesh::OBBTreeNode& node2,
                      const OrientedBoundingBox& node2Bounds, 
                      const Transform& transform, std::set<int>& triangles1, 
                      std::set<int>& triangles2) const;
    void findInsideTriangles(const ContactGeometry::TriangleMesh& mesh, 
                             const ContactGeometry::TriangleMesh& otherMesh,
                             const Transform& transform, 
                             std::set<int>& triangles) const;
    void tagFaces(const ContactGeometry::TriangleMesh& mesh, 
                  Array_<int>& faceType, std::set<int>& triangles, 
                  int index, int depth) const;
    static const int OUTSIDE = -1;
    static const int UNKNOWN = 0;
    static const int BOUNDARY = 1;
    static const int INSIDE = 2;
};

class SimTK_SIMMATH_EXPORT CollisionDetectionAlgorithm::ConvexConvex 
:   public CollisionDetectionAlgorithm {
public:
    virtual ~ConvexConvex() {}
    void processObjects
       (ContactSurfaceIndex index1, const ContactGeometry& object1,
        const Transform& transform1,
        ContactSurfaceIndex index2, const ContactGeometry& object2,
        const Transform& transform2,
        Array_<Contact>& contacts) const;
private:
    static Vec3 computeSupport(const ContactGeometry& object1, 
                               const ContactGeometry& object2,
                               const Transform& transform, UnitVec3 direction);
    static void addContact
       (ContactSurfaceIndex index1, ContactSurfaceIndex index2,
        const ContactGeometry& object1, 
        const ContactGeometry& object2,
        const Transform& transform1, const Transform& transform2, 
        const Transform& transform12,
        Vec3 point1, Vec3 point2, Array_<Contact>& contacts);
    static Vec6 computeErrorVector(const ContactGeometry& object1, 
                                   const ContactGeometry& object2, 
                                   Vec3 pos1, Vec3 pos2, 
                                   const Transform& transform12);
    static Mat66 computeJacobian(const ContactGeometry& object1, 
                                 const ContactGeometry& object2, 
                                 Vec3 pos1, Vec3 pos2, 
                                 const Transform& transform12);
};

} // namespace SimTK

#endif // SimTK_SIMMATH_COLLISION_DETECTION_ALGORITHM_H_