/usr/include/osgParticle/OrbitOperator is in libopenscenegraph-dev 3.2.1-6.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2010 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* 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
* OpenSceneGraph Public License for more details.
*/
// Written by Wang Rui, (C) 2010
#ifndef OSGPARTICLE_ORBITOPERATOR
#define OSGPARTICLE_ORBITOPERATOR
#include <osgParticle/ModularProgram>
#include <osgParticle/Operator>
#include <osgParticle/Particle>
namespace osgParticle
{
/** An orbit operator forces particles in the orbit around a point.
Refer to David McAllister's Particle System API (http://www.particlesystems.org)
*/
class OrbitOperator : public Operator
{
public:
OrbitOperator()
: Operator(), _magnitude(1.0f), _epsilon(1e-3), _maxRadius(FLT_MAX)
{}
OrbitOperator( const OrbitOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY )
: Operator(copy, copyop), _center(copy._center), _magnitude(copy._magnitude),
_epsilon(copy._epsilon), _maxRadius(copy._maxRadius)
{}
META_Object( osgParticle, OrbitOperator );
/// Set the center of orbit
void setCenter( const osg::Vec3& c ) { _center = c; }
/// Get the center of orbit
const osg::Vec3& getCenter() const { return _center; }
/// Set the acceleration scale
void setMagnitude( float mag ) { _magnitude = mag; }
/// Get the acceleration scale
float getMagnitude() const { return _magnitude; }
/// Set the acceleration epsilon
void setEpsilon( float eps ) { _epsilon = eps; }
/// Get the acceleration epsilon
float getEpsilon() const { return _epsilon; }
/// Set max radius between the center and the particle
void setMaxRadius( float max ) { _maxRadius = max; }
/// Get max radius between the center and the particle
float getMaxRadius() const { return _maxRadius; }
/// Apply the acceleration to a particle. Do not call this method manually.
inline void operate( Particle* P, double dt );
/// Perform some initializations. Do not call this method manually.
inline void beginOperate( Program* prg );
protected:
virtual ~OrbitOperator() {}
OrbitOperator& operator=( const OrbitOperator& ) { return *this; }
osg::Vec3 _center;
osg::Vec3 _xf_center;
float _magnitude;
float _epsilon;
float _maxRadius;
};
// INLINE METHODS
inline void OrbitOperator::operate( Particle* P, double dt )
{
osg::Vec3 dir = _xf_center - P->getPosition();
float length = dir.length();
if ( length<_maxRadius )
{
P->addVelocity( dir * ((_magnitude * dt) /
(length * (_epsilon+length*length))) );
}
}
inline void OrbitOperator::beginOperate( Program* prg )
{
if ( prg->getReferenceFrame()==ModularProgram::RELATIVE_RF )
{
_xf_center = prg->transformLocalToWorld(_center);
}
else
{
_xf_center = _center;
}
}
}
#endif
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