VolSlicer.h

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//------------------------------------------------------------------------
//
//   Joe Kniss
//     6-17-03
//                   ________    ____   ___ 
//                  |        \  /    | /  /
//                  +---+     \/     |/  /
//                  +--+|  |\    /|     < 
//                  |  ||  | \  / |  |\  \ 
//                  |      |  \/  |  | \  \ 
//                   \_____|      |__|  \__\
//                       Copyright  2003 
//                      Joe Michael Kniss
//                   <<< jmk@cs.utah.edu >>>
//               "All Your Base are Belong to Us"
//-------------------------------------------------------------------------

//VolSlicer.h

/// A base class for slicing a volume.  More generaly, generating
///  volume samples.  A strategy for "VolRenBase". 
/// Also implements the standard volume slicer.

#ifndef __VOLUME_SLICER_DOT_H
#define __VOLUME_SLICER_DOT_H

#include <mathGutz.h>
#include <arrayGutz.h>
#include <volume/Volytope.h>
#include <volume/VolSamples.h>

class VolSlicer : public gutz::Counted {
public:
   VolSlicer():_sampleSpace(.01f){}
   virtual ~VolSlicer(){}

   void setSampleSpace(float sp) {_sampleSpace = sp;}
   float getSampleSpace()        {return _sampleSpace;}

   virtual void slice( gutz::mat4f  mv,    // Model View Matrix
      VolytopeSP   vtp,   // A class containing a convex polytope with edge info
      VolSamplesSP vs,    // A class containing the verts, tcoords, idx, and prims for slices
      gutz::vec3f  axis);       // axis to slice along eye-space coords

protected:
   /////////////////////////////////////////////////////////////
   /// interect
   inline int intersect(
      const gutz::vec3f &m0, const gutz::vec3f &m1, //object-space line end points
      const gutz::vec3f &t0, const gutz::vec3f &t1, //texture-space line end points
      const gutz::vec3f &e0, const gutz::vec3f &e1, //eye-space line end points
      const gutz::vec3f &sp, const gutz::vec3f &sn, //plane point & norm
      gutz::vec3f &mnew,                            //object-space line/plane intersection
      gutz::vec4f &tnew,                            //texture-space line/plane intersection
      gutz::vec3f &enew);                           //eye-space line/plane intersection 

   float _sampleSpace;

};

typedef gutz::SmartPtr<VolSlicer> VolSlicerSP;

#endif

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