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00001 
+00007 /* Copyright, 2000 Nevrax Ltd.
+00008  *
+00009  * This file is part of NEVRAX NEL.
+00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
+00011  * it under the terms of the GNU General Public License as published by
+00012  * the Free Software Foundation; either version 2, or (at your option)
+00013  * any later version.
+00014 
+00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
+00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
+00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+00018  * General Public License for more details.
+00019 
+00020  * You should have received a copy of the GNU General Public License
+00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
+00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+00023  * MA 02111-1307, USA.
+00024  */
+00025 
+00026 #ifndef NL_BEZIER_PATCH_H
+00027 #define NL_BEZIER_PATCH_H
+00028 
+00029 #include "nel/misc/types_nl.h"
+00030 #include "nel/misc/vector.h"
+00031 #include "nel/misc/vectord.h"
+00032 #include "nel/misc/matrix.h"
+00033 
+00034 
+00035 namespace NL3D 
+00036 {
+00037 
+00038 
+00039 using NLMISC::CVector;
+00040 using NLMISC::CVectorD;
+00041 using NLMISC::CMatrix;
+00042 
+00043 
+00044 // ***************************************************************************
+00073 class CBezierPatch
+00074 {
+00075 public:
+00077         CVector         Vertices[4];            
+00079         CVector         Tangents[8];            
+00081         CVector         Interiors[4];           
+00082 
+00083 
+00084 public:
+00086         CBezierPatch() {}
+00087 
+00089         void            make(CVector vertices[4], CVector       normals[4]);
+00091         void            makeInteriors();
+00093         void            applyMatrix(const CMatrix &m);
+00094 
+00096         CVector         eval(float s, float t) const;                   // s,t coordinates for quad.
+00098         CVectorD        evalDouble(double s, double t) const;   // s,t coordinates for quad.
+00100         CVector         evalNormal(float s, float t) const;             // s,t coordinates for quad.
+00102         CVector         evalTangentS(float s, float t) const;   // s,t coordinates for quad.
+00104         CVector         evalTangentT(float s, float t) const;   // s,t coordinates for quad.
+00105 
+00106 
+00108         // @{
+00112         void            subdivideS(CBezierPatch &left, CBezierPatch &right, float s=0.5f) const;
+00116         void            subdivideT(CBezierPatch &top, CBezierPatch &bottom, float t=0.5f) const;
+00117         // @}
+00118 
+00119 
+00120 // **********************************
+00121 private:
+00122         struct  CBezierCurve
+00123         {
+00124                 CVector P0, P1, P2, P3;
+00125                 void    subdivide(CBezierCurve &left, CBezierCurve &right, float t);
+00126                 void    set(const CVector &a, const CVector &b, const CVector &c, const CVector &d)
+00127                 {
+00128                         P0= a; P1= b; P2= c; P3= d;
+00129                 }
+00130                 void    get(CVector &a, CVector &b, CVector &c, CVector &d)
+00131                 {
+00132                         a= P0; b= P1; c= P2; d= P3;
+00133                 }
+00134         };
+00135 
+00136 };
+00137 
+00138 
+00139 
+00140 } // NL3D
+00141 
+00142 
+00143 #endif // NL_BEZIER_PATCH_H
+00144 
+00145 /* End of bezier_patch.h */
+