SoNormalGenerator.h

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/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */
 
 
/*
 * Copyright (C) 1990,91   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Description:
 |      This file contains the definition of the SoNormalGenerator class.
 |
 |   Author(s)          : Thad Beier, Paul S. Strauss
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
 
#ifndef  _SO_NORMAL_GENERATOR_
#define  _SO_NORMAL_GENERATOR_
 
#include <Inventor/SbLinear.h>
 
 
SoEXTENDER class INVENTOR_API SoNormalGenerator {
 
  public:
    SoNormalGenerator(bool isCCW);
    SoNormalGenerator(bool isCCW, int approxNumVertices);
    ~SoNormalGenerator();
 
    void                beginPolygon();
    void                polygonVertex(const SbVec3f &point);
    void                endPolygon();
 
    void                triangle(const SbVec3f &p1,
                                 const SbVec3f &p2,
                                 const SbVec3f &p3);
 
    void                generate(float creaseAngle);
 
 
    int                 getNumNormals() const   { return numVertNormals; }
 
    void                setNumNormals(int newNum);
 
    const SbVec3f *     getNormals() const      { return vertNormals; }
 
    const SbVec3f &     getNormal(int32_t i) const      { return vertNormals[i]; }
 
    void                setNormal(int32_t index, const SbVec3f &newNormal);
 
  private:
    SbVec3f             *points, *faceNormals, *vertNormals;
    int32_t             numPoints, numVertNormals;
    int32_t             maxPoints, maxVertNormals;
 
    bool                isCCW;
 
    int32_t             beginPolygonIndex;
 
    static bool         equal(const SbVec3f &a, const SbVec3f &b, float tol);
};
 
#endif /* _SO_NORMAL_GENERATOR_ */