OpenSceneGraph 3.6.5
DampingOperator
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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2010 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version. The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * OpenSceneGraph Public License for more details.
12*/
13// Written by Wang Rui, (C) 2010
14
15#ifndef OSGPARTICLE_DAMPINGOPERATOR
16#define OSGPARTICLE_DAMPINGOPERATOR
17
18#include <osgParticle/Operator>
19#include <osgParticle/Particle>
20
21namespace osgParticle
22{
23
24
29{
30public:
32 { _damping.set(1.0f, 1.0f, 1.0f); }
33
35 : Operator(copy, copyop), _damping(copy._damping),
37 {}
38
40
42 void setDamping( float x, float y, float z ) { _damping.set(x, y, z); }
43 void setDamping( const osg::Vec3& damping ) { _damping = damping; }
44
46 void setDamping( float x ) { _damping.set(x, x, x); }
47
49 void getDamping( float& x, float& y, float& z ) const
50 { x = _damping.x(); y = _damping.y(); z = _damping.z(); }
51
52 const osg::Vec3& getDamping() const { return _damping; }
53
55 void setCutoff( float low, float high ) { _cutoffLow = low; _cutoffHigh = high; }
56 void setCutoffLow( float low ) { _cutoffLow = low; }
57 void setCutoffHigh( float low ) { _cutoffHigh = low; }
58
60 void getCutoff( float& low, float& high ) const { low = _cutoffLow; high = _cutoffHigh; }
61 float getCutoffLow() const { return _cutoffLow; }
62 float getCutoffHigh() const { return _cutoffHigh; }
63
65 inline void operate( Particle* P, double dt );
66
67protected:
68 virtual ~DampingOperator() {}
69 DampingOperator& operator=( const DampingOperator& ) { return *this; }
70
74};
75
76// INLINE METHODS
77
78inline void DampingOperator::operate( Particle* P, double dt )
79{
80 const osg::Vec3& vel = P->getVelocity();
81 float length2 = vel.length2();
82 if ( length2>=_cutoffLow && length2<=_cutoffHigh )
83 {
84 osg::Vec3 newvel( vel.x() * (1.0f - (1.0f - _damping.x()) * dt),
85 vel.y() * (1.0f - (1.0f - _damping.y()) * dt),
86 vel.z() * (1.0f - (1.0f - _damping.z()) * dt) );
87 P->setVelocity( newvel );
88 }
89}
90
91
92}
93
94#endif
Vec3f Vec3
Definition Vec3:21
The osgParticle library is a NodeKit that extends the core scene graph to support particle effects.
Definition AccelOperator:27
Copy Op(erator) used to control whether shallow or deep copy is used during copy construction and clo...
Definition CopyOp:41
@ SHALLOW_COPY
Definition CopyOp:47
value_type & z()
Definition Vec3f:82
value_type & y()
Definition Vec3f:81
value_type & x()
Definition Vec3f:80
value_type length2() const
Length squared of the vector = vec .
Definition Vec3f:182
void setCutoffHigh(float low)
Definition DampingOperator:57
void setDamping(const osg::Vec3 &damping)
Definition DampingOperator:43
META_Object(osgParticle, DampingOperator)
void setCutoff(float low, float high)
Set the velocity cutoff factors.
Definition DampingOperator:55
virtual ~DampingOperator()
Definition DampingOperator:68
void setDamping(float x, float y, float z)
Set the damping factors.
Definition DampingOperator:42
float getCutoffHigh() const
Definition DampingOperator:62
void getDamping(float &x, float &y, float &z) const
Get the damping factors.
Definition DampingOperator:49
float _cutoffHigh
Definition DampingOperator:73
const osg::Vec3 & getDamping() const
Definition DampingOperator:52
float _cutoffLow
Definition DampingOperator:72
void operate(Particle *P, double dt)
Apply the acceleration to a particle. Do not call this method manually.
Definition DampingOperator:78
osg::Vec3 _damping
Definition DampingOperator:71
void setCutoffLow(float low)
Definition DampingOperator:56
float getCutoffLow() const
Definition DampingOperator:61
DampingOperator(const DampingOperator &copy, const osg::CopyOp &copyop=osg::CopyOp::SHALLOW_COPY)
Definition DampingOperator:34
DampingOperator()
Definition DampingOperator:31
DampingOperator & operator=(const DampingOperator &)
Definition DampingOperator:69
void getCutoff(float &low, float &high) const
Get the velocity cutoff factors.
Definition DampingOperator:60
void setDamping(float x)
Set the damping factors to one value.
Definition DampingOperator:46
Operator()
Definition Operator:92
Implementation of a particle.
Definition Particle:47
const osg::Vec3 & getVelocity() const
Get the velocity vector.
Definition Particle:408
void setVelocity(const osg::Vec3 &v)
Set the velocity vector.
Definition Particle:488

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