GU/GU_Volume.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Mark Alexander
 *      Side Effects Software Inc.
 *      470 Richmond St. E
 *      Toronto, Ontario,  M5V 2M5
 *      Canada
 *      416-504-9876
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:
 *      Calculates the volume inside or on the surface of a 2 or 3D object.
 *
 */

#ifndef __GU_Volume_H__
#define __GU_Volume_H__

#include "GU_API.h"
#include <UT/UT_Vector3.h>
#include <UT/UT_BoundingBox.h>

class GU_Detail;

class GU_API GU_Volume
{
public:
    enum {
        HOLLOW_OBJECT,
        SOLID_OBJECT
    };

                 GU_Volume(GU_Detail *geo, int divs,
                           int type = SOLID_OBJECT);
    virtual     ~GU_Volume();

    float        getVolume();
    UT_Vector3   getCenterOfMass();
    float        getMomentOfInertia(const UT_Vector3 &about,
                                    const UT_Vector3 &axis,
                                    float mass = 1.0F);

    UT_Vector3   getResistanceTorque(const UT_Vector3 &rotvel,
                                     float resistance, int newtonmodel,
                                     float scale);
    
    void         DEBUGgetPoints(float *&pnts, int &num);

    UT_BoundingBox &getBoundingBox() { return myBounds; } 
private:
    void         voxelize();
    void         voxelize2D();
    void         voxelize3D();

    void         determineEdges();

    void         scanlineIntersect(const UT_Vector3 &o, const UT_Vector3 &d,
                                   int &numsections, float *pos, int *orient);
    
private:
    GU_Detail     *myGeometry;
    UT_BoundingBox myBounds;
    int            myDivisions;
    int            myObjectType;
    int            myIsVoxelized;
    int            myEdgesDetermined;
    unsigned char *myVoxels;

    // cached stuff...
    int            myIsVolumeCalc;
    float          myVolume;
    int            myIsCOMCalc;
    UT_Vector3     myCOM;          
};

#endif

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