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/* -*-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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#ifndef OSGPARTICLE_FLUIDPROGRAM |
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#define OSGPARTICLE_FLUIDPROGRAM 1 |
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#include <osgParticle/Export> |
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#include <osgParticle/Program> |
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#include <osg/CopyOp> |
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#include <osg/Object> |
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#include <osg/Node> |
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#include <osg/NodeVisitor> |
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namespace osgParticle |
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{ |
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/** A program class for performing operations on particles using a sequence of <I>operators</I>. |
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To use a <CODE>FluidProgram</CODE> you have to create some <CODE>Operator</CODE> objects and |
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add them to the program. |
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All operators will be applied to each particle in the same order they've been added to the program. |
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*/ |
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class OSGPARTICLE_EXPORT FluidProgram: public Program { |
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public: |
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FluidProgram(); |
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FluidProgram(const FluidProgram& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY); |
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META_Node(osgParticle,FluidProgram); |
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/// Set the viscosity of the fluid. |
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inline void setFluidViscosity(float v) |
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{ |
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_viscosity = v; |
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_viscosityCoefficient = 6 * osg::PI * _viscosity; |
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} |
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/// Get the viscosity of the fluid. |
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inline float getFluidViscosity() const { return _viscosity; } |
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/// Set the density of the fluid. |
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inline void setFluidDensity(float d) |
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{ |
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_density = d; |
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_densityCoefficient = 0.2f * osg::PI * _density; |
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} |
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/// Get the density of the fluid. |
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inline float getFluidDensity() const { return _density; } |
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/// Set the wind vector. |
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inline void setWind(const osg::Vec3& wind) { _wind = wind; } |
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/// Get the wind vector. |
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inline const osg::Vec3& getWind() const { return _wind; } |
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/// Set the acceleration vector. |
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inline void setAcceleration(const osg::Vec3& v) { _acceleration = v; } |
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/// Get the acceleration vector. |
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inline const osg::Vec3& getAcceleration() const { return _acceleration; } |
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/** Set the acceleration vector to the gravity on earth (0, 0, -9.81). |
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The acceleration will be multiplied by the <CODE>scale</CODE> parameter. |
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*/ |
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inline void setToGravity(float scale = 1.0f) { _acceleration.set(0, 0, -9.81f*scale); } |
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/// Set the fluid parameters as for air (20<EFBFBD>C temperature). |
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inline void setFluidToAir() |
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{ |
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setToGravity(1.0f); |
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setFluidDensity(1.2929f); |
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setFluidViscosity(1.8e-5f); |
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} |
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/// Set the fluid parameters as for pure water (20<EFBFBD>C temperature). |
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inline void setFluidToWater() |
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{ |
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setToGravity(1.0f); |
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setFluidDensity(1.0f); |
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setFluidViscosity(1.002e-3f); |
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} |
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protected: |
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virtual ~FluidProgram() {} |
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FluidProgram& operator=(const FluidProgram&) { return *this; } |
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virtual void execute(double dt); |
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osg::Vec3 _acceleration; |
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float _viscosity; |
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float _density; |
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osg::Vec3 _wind; |
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float _viscosityCoefficient; |
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float _densityCoefficient; |
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}; |
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} |
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#endif
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