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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
// -*- C++ -*-
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| Description:
| This file defines the SoLOD node class.
|
| Author(s) : Gavin Bell
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_LOD_
#define _SO_LOD_
#include <Inventor/fields/SoMFFloat.h>
#include <Inventor/fields/SoSFVec3f.h>
#include <Inventor/nodes/SoGroup.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoLOD
//
// Level-of-detail group node. The children of this node typically
// represent the same object or objects at varying levels of detail,
// from highest detail to lowest. The world-space distance of the
// eye from the transformed center of the LOD is computed, and one
// child is drawn, based on the values in the ranges field.
//
// More precisely, if the distance from the eyepoint to the
// transformed center is D and the ranges array contains LAST_RANGE+1
// values (numbered 0...LAST_RANGE), then:
//
// D < ranges[0] : Child 0 is drawn
// ranges[i-1] < D < ranges[i] : Child i is drawn
// D > ranges[LAST_RANGE] : Child LAST_RANGE+1 is drawn
//
// So, you should specify N ranges and N+1 children. If you specify
// too few children, the last child will be used for the extra
// ranges. If you specify too few ranges, the extra children will
// never be used.
//
// Add an SoInfo node as a child if you want a level of detail
// that doesn't draw anything.
//
//////////////////////////////////////////////////////////////////////////////
// C-api: public=center,ranges
class SoLOD : public SoGroup {
SO_NODE_HEADER(SoLOD);
public:
// Fields
SoMFFloat range; // World-space distances
SoSFVec3f center; // Center for computation
// Default constructor
SoLOD();
// Constructor that takes approximate number of children
// C-api: name=CreateN
SoLOD(int nChildren);
SoEXTENDER public:
// Implement actions:
virtual void doAction(SoAction *action);
virtual void callback(SoCallbackAction *action);
virtual void GLRender(SoGLRenderAction *action);
virtual void rayPick(SoRayPickAction *action);
virtual void getBoundingBox(SoGetBoundingBoxAction *action);
// These methods make render traversal faster by implementing
// different rendering paths corresponding to different action
// path codes.
virtual void GLRenderBelowPath(SoGLRenderAction *action);
virtual void GLRenderInPath(SoGLRenderAction *action);
virtual void GLRenderOffPath(SoGLRenderAction *action);
SoINTERNAL public:
static void initClass();
protected:
virtual ~SoLOD();
virtual int whichToTraverse(SoAction *);
};
#endif /* _SO_LOD_ */
|
