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00002 * Copyright 1991-1996, Silicon Graphics, Inc. 00003 * ALL RIGHTS RESERVED 00004 * 00005 * UNPUBLISHED -- Rights reserved under the copyright laws of the United 00006 * States.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 : Gavin Bell (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_LOD_ 00051 #define _SO_LOD_ 00052 00053 #include <Inventor/fields/SoMFFloat.h> 00054 #include <Inventor/fields/SoSFVec3f.h> 00055 #include <Inventor/nodes/SoGroup.h> 00056 00058 // 00059 // Class: SoLOD 00060 // 00061 // Level-of-detail group node. The children of this node typically 00062 // represent the same object or objects at varying levels of detail, 00063 // from highest detail to lowest. The world-space distance of the 00064 // eye from the transformed center of the LOD is computed, and one 00065 // child is drawn, based on the values in the ranges field. 00066 // 00067 // More precisely, if the distance from the eyepoint to the 00068 // transformed center is D and the ranges array contains LAST_RANGE+1 00069 // values (numbered 0...LAST_RANGE), then: 00070 // 00071 // D < ranges[0] : Child 0 is drawn 00072 // ranges[i-1] < D < ranges[i] : Child i is drawn 00073 // D > ranges[LAST_RANGE] : Child LAST_RANGE+1 is drawn 00074 // 00075 // So, you should specify N ranges and N+1 children. If you specify 00076 // too few children, the last child will be used for the extra 00077 // ranges. If you specify too few ranges, the extra children will 00078 // never be used. 00079 // 00080 // Add an SoInfo node as a child if you want a level of detail 00081 // that doesn't draw anything. 00082 // 00084 00142 class SoLOD : public SoGroup { 00143 00144 SO_NODE_HEADER(SoLOD); 00145 00146 public: 00147 // Fields 00152 SoMFFloat range; 00157 SoSFVec3f center; 00158 00162 SoLOD(); 00163 00167 SoLOD(int nChildren); 00168 00169 private: 00170 // Implement actions: 00171 virtual void doAction(SoAction *action); 00172 virtual void callback(SoCallbackAction *action); 00173 virtual void GLRender(SoGLRenderAction *action); 00174 virtual void rayPick(SoRayPickAction *action); 00175 virtual void getBoundingBox(SoGetBoundingBoxAction *action); 00176 virtual void getPrimitiveCount(SoGetPrimitiveCountAction *action); 00177 00178 // These methods make render traversal faster by implementing 00179 // different rendering paths corresponding to different action 00180 // path codes. 00181 virtual void GLRenderBelowPath(SoGLRenderAction *action); 00182 virtual void GLRenderInPath(SoGLRenderAction *action); 00183 virtual void GLRenderOffPath(SoGLRenderAction *action); 00184 00185 private: 00186 static void initClass(); 00187 static void exitClass(); 00188 00189 private: 00190 virtual ~SoLOD(); 00191 00192 virtual int whichToTraverse(SoAction *); 00193 }; 00194 00195 #endif /* _SO_LOD_ */ 00196 00197