GU/GU_RayRBezCurve.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:
 *      Jeff Lait
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        GU library (C++)
 *
 * COMMENTS:    Ray intersction objects for faces, this does not
 *      include closed faces (Ie: polygons)
 *
 */

#ifndef __GU_RayRBezCurve_h__
#define __GU_RayRBezCurve_h__

#include "GU_API.h"
#include <UT/UT_Matrix4.h>
#include <UT/UT_Matrix3.h>
#include <UT/UT_Vector3.h>
#include <UT/UT_Vector4Array.h>
#include <UT/UT_Matrix.h>
#include <UT/UT_BoundingBox.h>

#include "GU_RayIntersect.h"

class GEO_Point;
class GEO_Primitive;
class GU_RayInfo;
class GU_MinInfo;
class GU_RayRBezCurve;
class GU_RayRBezSurf;
class TS_MetaExpression;
class UT_BoundingRect;
class GU_IsectCurveSet;
class GU_IsectCurve;


//________________________________________________________
//
//  Bezier segment ray intersection class
//
//  Note: working in homogeneous coordinate
//________________________________________________________
//

class GU_API GU_RayRBezCurve
{
public:
    void        init(int order, float uStart, float uLength, int isRational);
    void        buildBBox();
    int         intersect(const UT_Vector3 &org,
                          const UT_Vector3 &dir,
                          GU_RayInfo &hitInfo, int depth) const;
    int         intersect(const UT_Vector3 &p,
                          GU_RayInfo &hitInfo, int depth) const;
    int         intersect(const GU_RayRBezCurve &curve,
                          GU_RayInfo &hitInfo, int depth) const;
    int         intersect(GU_RayRBezSurf &surf, GU_RayInfo &hitInfo,
                          int depth) const;
    int         intersectQR(GU_RayRBezSurf &surf, GU_RayInfo &hitInfo,
                          int depth) const;
    int         intersectAP(GU_RayRBezSurf &surf, GU_RayInfo &hitInfo);
    
    // checks the proximity of the ray to the end points of the curve, 
    // and compares it with the tolerance given in hit_info.
    // If ray passes within the given tolerance, in the hemispherical cup
    // at the end of the curve, that "seals" the cylidrical zone around
    // the curve, it is considered as a hit, and 1 is returned.
    // INPUTS:
    //   org, dir - the origin and direction of the ray
    //   hit_info - its tolerance is treated as a radius of a hemisphere at the 
    //              endpoints, within which to test the ray's presence
    // OUTPUT
    //   hit_info - if hit, a hit is added
    // RETURN:
    //  1 if hit: ray passes within tolerance radius of endpoint, otherwise 0
    int         intersectFirstPointZone(const UT_Vector3 &org,
                                        const UT_Vector3 &dir,
                                        GU_RayInfo &hit_info) const;
    int         intersectLastPointZone(const UT_Vector3 &org,
                                        const UT_Vector3 &dir,
                                        GU_RayInfo &hit_info) const;

    // Start/end are in 0,1 range.
    int         polishCurveSurf(const GU_RayRBezSurf &surf,
                                UT_Matrix &C1, UT_Matrix &C2, UT_Matrix &R, 
                                UT_Matrix &tmp, float start, float end, 
                                UT_RefArray<GU_RayInfoHit> &hits,
                                GU_RayFindType findType,
                                int firstiter = 3, float firsttol = 1e-2F,
                                int finaliter = 50, float finaltol = 1e-6F,
                                float ttol = 1e-3F);

    int         minimum(const UT_Vector3 &p,
                          GU_MinInfo &mininfo, int depth) const;
    int         minimum(const GU_RayRBezCurve &curve,
                          GU_MinInfo &mininfo, int depth,
                          int noBBoxTest = 0) const;

    void        split(GU_RayRBezCurve *left, GU_RayRBezCurve *right,
                      float tol) const;
    // Does an inplace cut at both start and end, ustart < uend.
    void        carve(float ustart, float uend);
    void        evaluate(float t, UT_Vector3 &pos) const;
    void        evaluate(float t, UT_Vector3 &pos, 
                          UT_Vector3 &der) const;
    void        evaluate(float t, UT_Vector3 &pos, 
                         UT_Vector3 &der, UT_Vector3 &der2) const;

    void        print() const;

public:
    UT_BoundingBox              myBBox;
    UT_Vector4Array             myCV;
    float                       myUStart, myULength;
    int                         myRational;
};

#endif

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