OSG实现场景漫游

下面的代码将可以实现场景模型的导入，然后在里面任意行走，于此同时还实现了碰撞检测。

源代码下载地址：

 

/* * File : Travel.cpp * Description : * Author : GuoShaoHao * E-mail : [e-mail] * Date : 2011/01/08 * * CopyRight @ South China Institute of Software Engineering,.GZU * */#include <iostream>#include <osgViewer/Viewer>#include <osg/Node>#include <osg/Geode>#include <osg/Group>#include <osgDB/ReadFile>#include <osgDB/WriteFile>#include <osgUtil/Optimizer>#include <osg/MatrixTransform>#include <osgViewer/ViewerEventHandlers>#include <osgGA/StateSetManipulator>#include "TravelManipulator.h"using namespace std;int main(){//创建Viewer对象osg::ref_ptr<osgViewer::Viewer>viewer = new osgViewer::Viewer();//添加状态事件//viewer.get()->addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );//窗口大小变化事件viewer.get()->addEventHandler(new osgViewer::WindowSizeHandler);//添加一些常用状态设置viewer.get()->addEventHandler(new osgViewer::StatsHandler);// 把漫游器加入到场景中TravelManipulator::TravelToScence(viewer.get());osg::ref_ptr<osg::Group>root = new osg::Group();// 读取地形osg::ref_ptr<osg::Node>node = osgDB::readNodeFile("D://OSG//data//lz.osg");// 读取飞机//osg::ref_ptr<osg::Node>tank = osgDB::readNodeFile("F://Models//Amx30//Amx30.IVE");osg::ref_ptr<osg::Node>B25 = osgDB::readNodeFile("Models//B25//B25.IVE");osg::ref_ptr < osg::MatrixTransform> scale = new osg::MatrixTransform ;scale ->setMatrix(osg::Matrix::scale(0.1, 0.1, 0.1)*osg::Matrix::translate(-10.0f, -250.0f, 99.0f)) ;scale ->addChild(B25.get()) ;// 添加到场景root->addChild(node.get());root->addChild(scale.get());//root->addChild(B25.get());// 优化场景数据osgUtil::Optimizer optimizer;optimizer.optimize(root.get());viewer->setSceneData(root.get());viewer->realize();viewer->run();return 0;}

 

#pragma once#include <osgViewer/Viewer>#include <osg/LineSegment>#include <osg/Point>#include <osg/Geometry>#include <osg/Node>#include <osg/Geode>#include <osg/Group>#include <osgGA/MatrixManipulator>#include <osgUtil/IntersectVisitor>#include <vector>class TravelManipulator:public osgGA::MatrixManipulator{public:TravelManipulator(void);~TravelManipulator(void);// 把漫游器添加到场景中static TravelManipulator * TravelToScence(osg::ref_ptr<osgViewer::Viewer>viewer);private:osg::ref_ptr<osgViewer::Viewer>m_pHostViewer;// 移动速度float m_fMoveSpeed;// 当前位置osg::Vec3 m_vPosition;// 旋转角度osg::Vec3 m_vRotation;public:// 鼠标左键状态bool m_bLeftButtonDown;// 鼠标位置float m_fpushX;float m_fpushY;// 设置矩阵virtual void setByMatrix(const osg::Matrix &matrix);// 设置逆矩阵virtual void setByInverseMatrix(const osg::Matrix &matrix);// 获取矩阵virtual osg::Matrixd getMatrix() const;// 获取逆矩阵virtual osg::Matrixd getInverseMatrix() const;// 事件处理函数virtual bool handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &us);// 屏幕角度float m_fAngle;// 位置变换void ChangePosition(osg::Vec3 &delta);// 碰撞检测状态bool m_bPeng;// 设置速度float getSpeed();void setSpeed(float &);// 设置初始位置void SetPosition(osg::Vec3 &position);osg::Vec3 GetPosition();};

 

#include "TravelManipulator.h"// 构造函数TravelManipulator::TravelManipulator():m_fMoveSpeed(1.0f), m_bLeftButtonDown(false), m_fpushX(0), m_fAngle(2.5), m_bPeng(true), m_fpushY(0){m_vPosition = osg::Vec3(-22.0f, -274.0f, 100.0f);m_vRotation = osg::Vec3(osg::PI_2, 0.0f, 0.0f);}TravelManipulator::~TravelManipulator(void){}// 把漫游器添加到场景中TravelManipulator *TravelManipulator::TravelToScence(osg::ref_ptr<osgViewer::Viewer> viewer){TravelManipulator* camera = new TravelManipulator;viewer->setCameraManipulator(camera);camera->m_pHostViewer = viewer;return camera;}// 设置矩阵void TravelManipulator::setByMatrix(const osg::Matrix &matrix){}// 设置逆矩阵void TravelManipulator::setByInverseMatrix(const osg::Matrix &matrix){}// 得到矩阵osg::Matrixd TravelManipulator::getMatrix(void)const{osg::Matrixd mat;mat.makeRotate(m_vRotation._v[0], osg::Vec3(1.0f, 0.0f, 0.0f), m_vRotation._v[1], osg::Vec3(0.0f, 1.0f, 0.0f), m_vRotation._v[2], osg::Vec3(0.0f, 0.0f, 1.0f));return mat * osg::Matrixd::translate(m_vPosition); }// 得到逆矩阵osg::Matrixd TravelManipulator::getInverseMatrix(void) const{osg::Matrixd mat;mat.makeRotate(m_vRotation._v[0], osg::Vec3(1.0f, 0.0f, 0.0f),m_vRotation._v[1], osg::Vec3(0.0f, 1.0f, 0.0f),m_vRotation._v[2], osg::Vec3(0.0f, 0.0f, 1.0f));return osg::Matrixd::inverse(mat * osg::Matrixd::translate(m_vPosition));}// 事件处理函数bool TravelManipulator::handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &us){// 获取鼠标位置float mouseX = ea.getX();float mouseY = ea.getY();switch(ea.getEventType()){case(osgGA::GUIEventAdapter::KEYDOWN):{// 空格键if(ea.getKey() == 0x20){us.requestRedraw();us.requestContinuousUpdate(false);return true;}// 上移键if (ea.getKey() == 0xFF50){ChangePosition(osg::Vec3(0, 0, m_fMoveSpeed));return true;}// 下移键if (ea.getKey() == 0xFF57){ChangePosition(osg::Vec3(0, 0, -m_fMoveSpeed));return true;}// 加速if (ea.getKey() == 0x2B){m_fMoveSpeed += 1.0f;return true;}// 减少速度if (ea.getKey() == 0x2D){m_fMoveSpeed -= 0.1f;if(m_fMoveSpeed < 1.0f){m_fMoveSpeed = 1.0f;}return true;}// 前进if (ea.getKey() == 0xFF52 || ea.getKey() == 0x57 || ea.getKey() == 0x77){ChangePosition(osg::Vec3(0, m_fMoveSpeed * sinf(osg::PI_2 + m_vRotation._v[2]), 0));ChangePosition(osg::Vec3(m_fMoveSpeed * cosf(osg::PI_2 + m_vRotation._v[2]),0,0));return true;}// 后退if (ea.getKey() == 0xFF54 || ea.getKey() == 0x53 || ea.getKey() == 0x73){ChangePosition(osg::Vec3(0, -m_fMoveSpeed * sinf(osg::PI_2 + m_vRotation._v[2]), 0));ChangePosition(osg::Vec3(-m_fMoveSpeed * cosf(osg::PI_2 + m_vRotation._v[2]),0,0));return true;}// 向左if (ea.getKey() == 0x41 || ea.getKey() == 0x61){ChangePosition(osg::Vec3(0, m_fMoveSpeed * cosf(osg::PI_2 + m_vRotation._v[2]),0));ChangePosition(osg::Vec3(-m_fMoveSpeed * sinf(osg::PI_2 + m_vRotation._v[2]),0,0));return true;}// 向右if (ea.getKey() == 0x44 || ea.getKey() == 0x64){ChangePosition(osg::Vec3(0, -m_fMoveSpeed * cosf(osg::PI_2 + m_vRotation._v[2]),0));ChangePosition(osg::Vec3(m_fMoveSpeed * sinf(osg::PI_2 + m_vRotation._v[2]),0,0));return true;}// 向右转if (ea.getKey() == 0xFF53){m_vRotation._v[2] -= osg::DegreesToRadians(m_fAngle);}// 向左转if (ea.getKey() == 0xFF51){m_vRotation._v[2] += osg::DegreesToRadians(m_fAngle);}// 改变屏幕角度F键if (ea.getKey() == 0x46 || ea.getKey() == 0x66){m_fAngle -= 0.2;return true;}//G键if (ea.getKey() == 0x47 || ea.getKey() == 0x66){m_fAngle += 0.2;return true;}return true;}case(osgGA::GUIEventAdapter::PUSH):if (ea.getButton() == 1){m_fpushX = mouseX;m_fpushY = mouseY;m_bLeftButtonDown = true;}return true;// 拖动case(osgGA::GUIEventAdapter::DRAG):if (m_bLeftButtonDown){m_vRotation._v[2] -= osg::DegreesToRadians(m_fAngle * (mouseX - m_fpushX)) / 200;m_vRotation._v[0] += osg::DegreesToRadians(1.1 * (mouseY - m_fpushY)) / 200;if (m_vRotation._v[0] >= 3.14){m_vRotation._v[0] = 3.14;}if (m_vRotation._v[0] <= 0){m_vRotation._v[0] = 0;}}return false;// 鼠标释放case(osgGA::GUIEventAdapter::RELEASE):if (ea.getButton() == 1){m_bLeftButtonDown = false;}return false;default:return false;}}// 位置变换函数void TravelManipulator::ChangePosition(osg::Vec3 &delta){// 碰撞检测if (m_bPeng){// 得到新的位置osg::Vec3 newPos1 = m_vPosition + delta;osgUtil::IntersectVisitor ivXY;// 根据新的位置得到两条线段检测osg::ref_ptr<osg::LineSegment>lineXY = new osg::LineSegment(newPos1, m_vPosition);osg::ref_ptr<osg::LineSegment>lineZ = new osg::LineSegment(newPos1 + osg::Vec3(0.0f, 0.0f, 10.0f), newPos1 - osg::Vec3(0.0f, 0.0f, -10.0f));ivXY.addLineSegment(lineZ.get());ivXY.addLineSegment(lineXY.get());// 结构交集检测m_pHostViewer->getSceneData()->accept(ivXY);// 如果没有碰撞if (!ivXY.hits()){m_vPosition += delta;}}else{m_vPosition += delta;}}// 设置速度void TravelManipulator::setSpeed(float &sp){m_fMoveSpeed = sp;}// 获得当前速度float TravelManipulator::getSpeed(){return m_fMoveSpeed;}// 设置起始的位置void TravelManipulator::SetPosition(osg::Vec3 &position){m_vPosition = position;}// 得到当前所在位置osg::Vec3 TravelManipulator::GetPosition(){return m_vPosition;}