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132 lines
4.8 KiB
132 lines
4.8 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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#ifndef OSG_BILLBOARD |
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#define OSG_BILLBOARD 1 |
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#include <osg/Matrix> |
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#include <osg/Geode> |
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namespace osg { |
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/** Billboard is a derived form of Geode that orients its osg::Drawable |
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* children to face the eye point. Typical uses include trees and |
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* particle explosions, |
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*/ |
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class OSG_EXPORT Billboard : public Geode |
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{ |
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public: |
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enum Mode { |
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POINT_ROT_EYE, |
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POINT_ROT_WORLD, |
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AXIAL_ROT |
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}; |
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Billboard(); |
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */ |
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Billboard(const Billboard&,const CopyOp& copyop=CopyOp::SHALLOW_COPY); |
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META_Node(osg, Billboard); |
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/** Set the billboard rotation mode. */ |
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void setMode(Mode mode); |
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/** Get the billboard rotation mode. */ |
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inline Mode getMode() const { return _mode; } |
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/** Set the rotation axis for the billboard's child Drawables. |
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* Only utilized when mode==AXIAL_ROT. */ |
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void setAxis(const Vec3& axis); |
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/** Get the rotation axis. */ |
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inline const Vec3& getAxis() const { return _axis; } |
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/** This normal defines child Drawables' front face direction when unrotated. */ |
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void setNormal(const Vec3& normal); |
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/** Get the front face direction normal. */ |
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inline const Vec3& getNormal() const { return _normal; } |
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/** Set the specified child Drawable's position. */ |
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inline void setPosition(unsigned int i,const Vec3& pos) { _positionList[i] = pos; } |
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/** Get the specified child Drawable's position. */ |
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inline const Vec3& getPosition(unsigned int i) const { return _positionList[i]; } |
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/** Type definition for pivot point position list. */ |
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typedef std::vector<Vec3> PositionList; |
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/** Set the list of pivot point positions. */ |
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inline void setPositionList(PositionList& pl) { _positionList=pl; } |
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/** Get the list of pivot point positions. */ |
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inline PositionList& getPositionList() { return _positionList; } |
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/** Get a const list of pivot point positions. */ |
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inline const PositionList& getPositionList() const { return _positionList; } |
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/** Add a Drawable with a default position of Vec3(0,0,0). |
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* Call the base-class Geode::addDrawble() to add the given Drawable |
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* gset as a child. If Geode::addDrawable() returns true, add the |
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* default position to the pivot point position list and return true. |
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* Otherwise, return false. */ |
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virtual bool addDrawable( Drawable *gset ); |
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/** Add a Drawable with a specified position. |
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* Call the base-class Geode::addDrawble() to add the given Drawable |
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* gset as a child. If Geode::addDrawable() returns true, add the |
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* given position pos to the pivot point position list and return true. |
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* Otherwise, return false. */ |
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virtual bool addDrawable(Drawable *gset,const Vec3& pos); |
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/** Remove a Drawable and its associated position. |
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* If gset is a child, remove it, decrement its reference count, |
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* remove its pivot point position. and return true. |
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* Otherwise, return false. */ |
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virtual bool removeDrawable( Drawable *gset ); |
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bool computeMatrix(Matrix& modelview, const Vec3& eye_local, const Vec3& pos_local) const; |
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virtual BoundingSphere computeBound() const; |
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protected: |
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virtual ~Billboard(); |
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enum AxisAligned |
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{ |
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AXIAL_ROT_X_AXIS=AXIAL_ROT+1, |
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AXIAL_ROT_Y_AXIS, |
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AXIAL_ROT_Z_AXIS, |
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POINT_ROT_WORLD_Z_AXIS, |
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CACHE_DIRTY |
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}; |
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Mode _mode; |
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Vec3 _axis; |
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Vec3 _normal; |
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Matrix _rotateNormalToZAxis; |
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PositionList _positionList; |
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// used internally as cache of which what _axis is aligned to help |
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// decide which method of rotation to use. |
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int _cachedMode; |
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Vec3 _side; |
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void updateCache(); |
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}; |
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} |
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#endif
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