/usr/include/osgParticle/DampingOperator is in libopenscenegraph-dev 3.2.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /* -*-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_DAMPINGOPERATOR
#define OSGPARTICLE_DAMPINGOPERATOR
#include <osgParticle/Operator>
#include <osgParticle/Particle>
namespace osgParticle
{
/** A damping operator applies damping constant to particle's velocity.
Refer to David McAllister's Particle System API (http://www.particlesystems.org)
*/
class DampingOperator : public Operator
{
public:
DampingOperator() : Operator(), _cutoffLow(0.0f), _cutoffHigh(FLT_MAX)
{ _damping.set(1.0f, 1.0f, 1.0f); }
DampingOperator( const DampingOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY )
: Operator(copy, copyop), _damping(copy._damping),
_cutoffLow(copy._cutoffLow), _cutoffHigh(copy._cutoffHigh)
{}
META_Object( osgParticle, DampingOperator );
/// Set the damping factors
void setDamping( float x, float y, float z ) { _damping.set(x, y, z); }
void setDamping( const osg::Vec3& damping ) { _damping = damping; }
/// Set the damping factors to one value
void setDamping( float x ) { _damping.set(x, x, x); }
/// Get the damping factors
void getDamping( float& x, float& y, float& z ) const
{ x = _damping.x(); y = _damping.y(); z = _damping.z(); }
const osg::Vec3& getDamping() const { return _damping; }
/// Set the velocity cutoff factors
void setCutoff( float low, float high ) { _cutoffLow = low; _cutoffHigh = high; }
void setCutoffLow( float low ) { _cutoffLow = low; }
void setCutoffHigh( float low ) { _cutoffHigh = low; }
/// Get the velocity cutoff factors
void getCutoff( float& low, float& high ) const { low = _cutoffLow; high = _cutoffHigh; }
float getCutoffLow() const { return _cutoffLow; }
float getCutoffHigh() const { return _cutoffHigh; }
/// Apply the acceleration to a particle. Do not call this method manually.
inline void operate( Particle* P, double dt );
protected:
virtual ~DampingOperator() {}
DampingOperator& operator=( const DampingOperator& ) { return *this; }
osg::Vec3 _damping;
float _cutoffLow;
float _cutoffHigh;
};
// INLINE METHODS
inline void DampingOperator::operate( Particle* P, double dt )
{
const osg::Vec3& vel = P->getVelocity();
float length2 = vel.length2();
if ( length2>=_cutoffLow && length2<=_cutoffHigh )
{
osg::Vec3 newvel( vel.x() * (1.0f - (1.0f - _damping.x()) * dt),
vel.y() * (1.0f - (1.0f - _damping.y()) * dt),
vel.z() * (1.0f - (1.0f - _damping.z()) * dt) );
P->setVelocity( newvel );
}
}
}
#endif
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