/usr/include/osgParticle/ExplosionOperator is in libopenscenegraph-dev 3.0.1-4.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | /* -*-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_EXPLOSIONOPERATOR
#define OSGPARTICLE_EXPLOSIONOPERATOR
#include <osgParticle/ModularProgram>
#include <osgParticle/Operator>
#include <osgParticle/Particle>
namespace osgParticle
{
/** An explosion operator exerts force on each particle away from the explosion center.
Refer to David McAllister's Particle System API (http://www.particlesystems.org)
*/
class ExplosionOperator : public Operator
{
public:
ExplosionOperator()
: Operator(), _radius(1.0f),
_magnitude(1.0f), _epsilon(1e-3), _sigma(1.0f),
_inexp(0.0f), _outexp(0.0f)
{}
ExplosionOperator( const ExplosionOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY )
: Operator(copy, copyop), _center(copy._center), _radius(copy._radius),
_magnitude(copy._magnitude), _epsilon(copy._epsilon), _sigma(copy._sigma),
_inexp(copy._inexp), _outexp(copy._outexp)
{}
META_Object( osgParticle, ExplosionOperator );
/// Set the center of shock wave
void setCenter( const osg::Vec3& c ) { _center = c; }
/// Get the center of shock wave
const osg::Vec3& getCenter() const { return _center; }
/// Set the radius of wave peak
void setRadius( float r ) { _radius = r; }
/// Get the radius of wave peak
float getRadius() const { return _radius; }
/// 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 broadness of the strength of the wave
void setSigma( float s ) { _sigma = s; }
/// Get broadness of the strength of the wave
float getSigma() const { return _sigma; }
/// 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 ~ExplosionOperator() {}
ExplosionOperator& operator=( const ExplosionOperator& ) { return *this; }
osg::Vec3 _center;
osg::Vec3 _xf_center;
float _radius;
float _magnitude;
float _epsilon;
float _sigma;
float _inexp;
float _outexp;
};
// INLINE METHODS
inline void ExplosionOperator::operate( Particle* P, double dt )
{
osg::Vec3 dir = P->getPosition() - _xf_center;
float length = dir.length();
float distanceFromWave2 = (_radius - length) * (_radius - length);
float Gd = exp(distanceFromWave2 * _inexp) * _outexp;
float factor = (_magnitude * dt) / (length * (_epsilon+length*length));
P->addVelocity( dir * (Gd * factor) );
}
inline void ExplosionOperator::beginOperate( Program* prg )
{
if ( prg->getReferenceFrame()==ModularProgram::RELATIVE_RF )
{
_xf_center = prg->transformLocalToWorld(_center);
}
else
{
_xf_center = _center;
}
float oneOverSigma = (_sigma!=0.0f ? (1.0f / _sigma) : 1.0f);
_inexp = -0.5f * oneOverSigma * oneOverSigma;
_outexp = oneOverSigma / sqrt(osg::PI * 2.0f);
}
}
#endif
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