00001 /*======================================================================= 00002 * Copyright 1991-1996, Silicon Graphics, Inc. 00003 * ALL RIGHTS RESERVED 00004 * 00005 * UNPUBLISHED -- Rights reserved under the copyright laws of the United 00006 * States. Use of a copyright notice is precautionary only and does not 00007 * imply publication or disclosure. 00008 * 00009 * U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND: 00010 * Use, duplication or disclosure by the Government is subject to restrictions 00011 * as set forth in FAR 52.227.19(c)(2) or subparagraph (c)(1)(ii) of the Rights 00012 * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or 00013 * in similar or successor clauses in the FAR, or the DOD or NASA FAR 00014 * Supplement. Contractor/manufacturer is Silicon Graphics, Inc., 00015 * 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311. 00016 * 00017 * THE CONTENT OF THIS WORK CONTAINS CONFIDENTIAL AND PROPRIETARY 00018 * INFORMATION OF SILICON GRAPHICS, INC. ANY DUPLICATION, MODIFICATION, 00019 * DISTRIBUTION, OR DISCLOSURE IN ANY FORM, IN WHOLE, OR IN PART, IS STRICTLY 00020 * PROHIBITED WITHOUT THE PRIOR EXPRESS WRITTEN PERMISSION OF SILICON 00021 * GRAPHICS, INC. 00022 **=======================================================================*/ 00023 /*======================================================================= 00024 ** Author : Dave Immel (MMM yyyy) 00025 **=======================================================================*/ 00026 /*======================================================================= 00027 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.), *** 00028 *** AND IS DISTRIBUTED UNDER A LICENSE AGREEMENT. *** 00029 *** *** 00030 *** REPRODUCTION, DISCLOSURE, OR USE, IN WHOLE OR IN PART, OTHER THAN AS *** 00031 *** SPECIFIED IN THE LICENSE ARE NOT TO BE UNDERTAKEN EXCEPT WITH PRIOR *** 00032 *** WRITTEN AUTHORIZATION OF FEI S.A.S. *** 00033 *** *** 00034 *** RESTRICTED RIGHTS LEGEND *** 00035 *** USE, DUPLICATION, OR DISCLOSURE BY THE GOVERNMENT OF THE CONTENT OF THIS *** 00036 *** WORK OR RELATED DOCUMENTATION IS SUBJECT TO RESTRICTIONS AS SET FORTH IN *** 00037 *** SUBPARAGRAPH (C)(1) OF THE COMMERCIAL COMPUTER SOFTWARE RESTRICTED RIGHT *** 00038 *** CLAUSE AT FAR 52.227-19 OR SUBPARAGRAPH (C)(1)(II) OF THE RIGHTS IN *** 00039 *** TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 52.227-7013. *** 00040 *** *** 00041 *** COPYRIGHT (C) 1996-2020 BY FEI S.A.S, *** 00042 *** BORDEAUX, FRANCE *** 00043 *** ALL RIGHTS RESERVED *** 00044 **=======================================================================*/ 00045 /*======================================================================= 00046 ** Modified by : VSG (MMM YYYY) 00047 **=======================================================================*/ 00048 00049 00050 #ifndef _SO_NURBS_CURVE_ 00051 #define _SO_NURBS_CURVE_ 00052 00053 #include <Inventor/fields/SoMFFloat.h> 00054 #include <Inventor/fields/SoSFFloat.h> 00055 #include <Inventor/fields/SoSFInt32.h> 00056 #include <Inventor/nodes/SoShape.h> 00057 00059 // 00060 // Class: SoNurbsCurve 00061 // 00062 // NURBS curve. The curve consists of a knot vector and order for 00063 // the U parametric directions. The control points for the curve 00064 // are obtained from the current coordinates. 00065 // 00067 00068 class SoState; 00069 class SoNurbsCurveCache; 00070 class SbThreadRWMutex; 00071 00132 class SoNurbsCurve : public SoShape { 00133 00134 SO_NODE_HEADER(SoNurbsCurve); 00135 00136 public: 00140 SoSFInt32 numControlPoints; 00141 00145 SoMFFloat knotVector; 00146 00150 SoNurbsCurve(); 00151 00152 private: 00153 virtual void GLRender(SoGLRenderAction *action); 00154 virtual void rayPick(SoRayPickAction *action); 00155 virtual void getPrimitiveCount(SoGetPrimitiveCountAction *action); 00156 00157 // Redefine this to tell open caches that they contain lines 00158 virtual void getBoundingBox(SoGetBoundingBoxAction *action); 00159 00160 // Computes bounding box of curve 00161 virtual void computeBBox(SoAction *action, SbBox3f &box, 00162 SbVec3f ¢er); 00163 00164 private: 00165 static void initClass(); 00166 static void exitClass(); 00167 00168 private: 00169 // Generates triangles representing a sphere 00170 virtual void generatePrimitives(SoAction *action); 00171 00172 ~SoNurbsCurve(); 00173 00174 private: 00175 SoNurbsCurveCache *nurbsCache; 00176 SbThreadRWMutex *nurbsCacheMutex; 00177 int isValid(SoState *state); 00178 00179 // Tesselate the surface 00180 void tesselateNURBS_G5G(SoAction *action, int32_t steps); 00181 00182 // Render the surface 00183 void drawNURBS_G5G(SoAction *action, int32_t steps); 00184 00185 // Functions to compute complexity from Complexity 00186 // and decimation elements 00187 int computeSteps(SoState *state); 00188 int computeScreenSpaceSteps(SoState *state); 00189 00190 void invalidateCache(); 00191 void createNurbsCache(SoState *state); 00192 }; 00193 00194 #endif /* _SO_NURBS_CURVE_ */ 00195 00196