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nurbsSurfaceResult.h
00001 // Filename: nurbsSurfaceResult.h
00002 // Created by:  drose (10Oct03)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef NURBSSURFACERESULT_H
00016 #define NURBSSURFACERESULT_H
00017 
00018 #include "pandabase.h"
00019 #include "referenceCount.h"
00020 #include "nurbsBasisVector.h"
00021 
00022 class NurbsVertex;
00023 
00024 ////////////////////////////////////////////////////////////////////
00025 //       Class : NurbsSurfaceResult
00026 // Description : The result of a NurbsSurfaceEvaluator.  This object
00027 //               represents a surface in a particular coordinate space.
00028 //               It can return the point and/or normal to the surface
00029 //               at any point.
00030 ////////////////////////////////////////////////////////////////////
00031 class EXPCL_PANDA_PARAMETRICS NurbsSurfaceResult : public ReferenceCount {
00032 public:
00033   NurbsSurfaceResult(const NurbsBasisVector &u_basis, 
00034                      const NurbsBasisVector &v_basis, 
00035                      const LVecBase4 vecs[], const NurbsVertex *verts,
00036                      int num_u_vertices, int num_v_vertices);
00037 
00038 PUBLISHED:
00039   INLINE ~NurbsSurfaceResult();
00040 
00041   INLINE PN_stdfloat get_start_u() const;
00042   INLINE PN_stdfloat get_end_u() const;
00043 
00044   INLINE PN_stdfloat get_start_v() const;
00045   INLINE PN_stdfloat get_end_v() const;
00046 
00047   INLINE bool eval_point(PN_stdfloat u, PN_stdfloat v, LVecBase3 &point);
00048   INLINE bool eval_normal(PN_stdfloat u, PN_stdfloat v, LVecBase3 &normal);
00049   INLINE PN_stdfloat eval_extended_point(PN_stdfloat u, PN_stdfloat v, int d);
00050   INLINE bool eval_extended_points(PN_stdfloat u, PN_stdfloat v, int d, 
00051                                    PN_stdfloat result[], int num_values);
00052   
00053   INLINE int get_num_u_segments() const;
00054   INLINE int get_num_v_segments() const;
00055   void eval_segment_point(int ui, int vi, PN_stdfloat u, PN_stdfloat v, LVecBase3 &point) const;
00056   void eval_segment_normal(int ui, int vi, PN_stdfloat u, PN_stdfloat v, LVecBase3 &normal) const;
00057   PN_stdfloat eval_segment_extended_point(int ui, int vi, PN_stdfloat u, PN_stdfloat v, int d) const;
00058   void eval_segment_extended_points(int ui, int vi, PN_stdfloat u, PN_stdfloat v, int d,
00059                                     PN_stdfloat result[], int num_values) const;
00060   INLINE PN_stdfloat get_segment_u(int ui, PN_stdfloat u) const;
00061   INLINE PN_stdfloat get_segment_v(int vi, PN_stdfloat v) const;
00062   
00063 private:
00064   INLINE int verti(int ui, int vi) const;
00065   INLINE int segi(int ui, int vi) const;
00066 
00067   int find_u_segment(PN_stdfloat u);
00068   int r_find_u_segment(PN_stdfloat u, int top, int bot) const;
00069   int find_v_segment(PN_stdfloat v);
00070   int r_find_v_segment(PN_stdfloat v, int top, int bot) const;
00071 
00072   NurbsBasisVector _u_basis;
00073   NurbsBasisVector _v_basis;
00074   const NurbsVertex *_verts;
00075   int _num_u_vertices;
00076   int _num_v_vertices;
00077 
00078   // We pre-compose the basis matrix and the geometry vectors, so we
00079   // have these handy for evaluation.  There is one entry in the
00080   // _composed for each entry in u_basis._segments *
00081   // v_basis._segments.
00082   class ComposedMats {
00083   public:
00084     LMatrix4 _x, _y, _z, _w;
00085   };
00086   typedef epvector<ComposedMats> ComposedGeom;
00087   ComposedGeom _composed;
00088 
00089 
00090   int _last_u_segment;
00091   PN_stdfloat _last_u_from;
00092   PN_stdfloat _last_u_to;
00093   int _last_v_segment;
00094   PN_stdfloat _last_v_from;
00095   PN_stdfloat _last_v_to;
00096 };
00097 
00098 #include "nurbsSurfaceResult.I"
00099 
00100 #endif
00101 
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