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98 lines
3.0 KiB
98 lines
3.0 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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//osgParticle - Copyright (C) 2002 Marco Jez |
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#ifndef OSGPARTICLE_FORCEOPERATOR |
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#define OSGPARTICLE_FORCEOPERATOR 1 |
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#include <osgParticle/ModularProgram> |
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#include <osgParticle/Operator> |
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#include <osgParticle/Particle> |
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#include <osg/CopyOp> |
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#include <osg/Object> |
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#include <osg/Vec3> |
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namespace osgParticle |
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{ |
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/** An operator that applies a constant force to the particles. |
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* Remember that if the mass of particles is expressed in kg and the lengths are |
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* expressed in meters, then the force should be expressed in Newtons. |
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*/ |
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class ForceOperator: public Operator { |
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public: |
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inline ForceOperator(); |
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inline ForceOperator(const ForceOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY); |
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META_Object(osgParticle, ForceOperator); |
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/// Get the force vector. |
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inline const osg::Vec3& getForce() const; |
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/// Set the force vector. |
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inline void setForce(const osg::Vec3& f); |
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/// Apply the force to a particle. Do not call this method manually. |
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inline void operate(Particle* P, double dt); |
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/// Perform some initialization. Do not call this method manually. |
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inline void beginOperate(Program *prg); |
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protected: |
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virtual ~ForceOperator() {}; |
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ForceOperator& operator=(const ForceOperator&) { return *this; } |
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private: |
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osg::Vec3 _force; |
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osg::Vec3 _xf_force; |
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}; |
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// INLINE FUNCTIONS |
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inline ForceOperator::ForceOperator() |
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: Operator(), _force(0, 0, 0) |
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{ |
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} |
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inline ForceOperator::ForceOperator(const ForceOperator& copy, const osg::CopyOp& copyop) |
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: Operator(copy, copyop), _force(copy._force) |
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{ |
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} |
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inline const osg::Vec3& ForceOperator::getForce() const |
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{ |
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return _force; |
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} |
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inline void ForceOperator::setForce(const osg::Vec3& v) |
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{ |
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_force = v; |
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} |
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inline void ForceOperator::operate(Particle* P, double dt) |
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{ |
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P->addVelocity(_xf_force * (P->getMassInv() * dt)); |
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} |
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inline void ForceOperator::beginOperate(Program *prg) |
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{ |
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if (prg->getReferenceFrame() == ModularProgram::RELATIVE_RF) { |
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_xf_force = prg->rotateLocalToWorld(_force); |
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} else { |
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_xf_force = _force; |
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} |
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} |
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} |
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#endif
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