I have loaded 3D Model in my scene and i want to walk through in the world. i achieved forward,backward,left,right,up and down but i need to rotate my camera at that camera location about x,y,z but i aam not able to get please help me??
#include <osgViewer/ViewerEventHandlers>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osg/Camera>
#include <math.h>
osg::Matrixd md ;
osg::Matrixd originalmd ;
osg::Quat qua;
float angle=0;
osgViewer::Viewer viewer;
osg::Vec3f eye=osg::Vec3f(1.0,-200.0,2.0);
osg::Vec3f centre=osg::Vec3f(0.0,0.0,0.0);
osg::Vec3f up=osg::Vec3f(0.0,0.0,1.0);
osg::Vec3f originaleye=osg::Vec3f(0.0,-200.0,0.0);
osg::Vec3f originalcentre=osg::Vec3f(0.0,0.0,0.0);
osg::Vec3f originalup=osg::Vec3f(0.0,0.0,1.0);
int ConstantVariation=5;
class PickHandler : public osgGA::GUIEventHandler
{
public:
PickHandler() {}
~PickHandler() {}
bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa);
protected:
};
bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
{
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::PUSH):
{
osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
//if (view) pick(view,ea);
return false;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='c')
{
osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
osg::ref_ptr<osgGA::GUIEventAdapter> event = new osgGA::GUIEventAdapter(ea);
event->setX((ea.getXmin()+ea.getXmax())*0.5);
event->setY((ea.getYmin()+ea.getYmax())*0.5);
// if (view) pick(view,*event);
}
if (ea.getKey()== osgGA::GUIEventAdapter::KEY_Up)
{
std::cout<<"Forward"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans=md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
md.getLookAt(eye,centre,up);
trans.z()=trans.z()+5;
md.setTrans(trans);
}
if (ea.getKey()==osgGA::GUIEventAdapter::KEY_Down)
{
std::cout<<"BackWard"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans=md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
md.getLookAt(eye,centre,up);
trans.z()=trans.z()-5;
md.setTrans(trans);
}
if (ea.getKey()==osgGA::GUIEventAdapter::KEY_Left)
{
std::cout<<"LEFT Side"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans=md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
md.getLookAt(eye,centre,up);
trans.x()=trans.x()+5;
md.setTrans(trans);
}
if (ea.getKey()==osgGA::GUIEventAdapter::KEY_Right)
{
std::cout<<"Right Side"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans = md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
trans.x()=trans.x()-5;
md.setTrans(trans);
}
if(ea.getKey()==osgGA::GUIEventAdapter::KEY_Page_Up)
{
std::cout<<"UP"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans = md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
trans.y()=trans.y()-5;
md.setTrans(trans);
}
if(ea.getKey()==osgGA::GUIEventAdapter::KEY_Page_Down)
{
std::cout<<"Down"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans = md.getTrans();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
trans.y()=trans.y()+5;
md.setTrans(trans);
}
if(ea.getKey()==osgGA::GUIEventAdapter::KEY_8)
{
std::cout<<"Rotation"<<std::endl;
md=viewer.getCamera()->getViewMatrix();
osg::Vec3d trans=md.getTrans();
double a=trans.x();
double b=trans.y();
double c=trans.z();
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
md.setTrans(osg::Vec3d(0,0,0));
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
angle=0.077;
//osg::Quat qa(angle,osg::Vec3d(0.0,0.0,1.0));
md.getLookAt(eye,centre,up);
osg::Quat qa(angle,up);
md.setRotate(qa);
up=md.getRotate()*trans;
md.setRotate(qa);
trans.x()=a;
trans.y()=b;
trans.z()=c;
md.setTrans(trans);
std::cout<<"translation="<<trans.x()<<","<<trans.y()<<","<<trans.z()<<std::endl;
std::cout<<" End Rotation"<<std::endl;
}
if(ea.getKey()==osgGA::GUIEventAdapter::KEY_Space)
{
md=originalmd;
}
return false;
}
default:
return false;
}
}
int main( int argc, char **argv )
{
osg::ref_ptr<osg::Group> scene = new osg::Group;
scene->addChild(osgDB::readNodeFile("cessna.osg"));
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
viewer.addEventHandler(new PickHandler());
viewer.setSceneData(scene.get());
const osg::BoundingSphere& bs = scene->getBound();
viewer.getCamera()->setViewMatrixAsLookAt(bs.center()+osg::Vec3(0.0f, -(3*bs.radius()),0.0f), bs.center(), osg::Z_AXIS) ;
md=viewer.getCamera()->getViewMatrix();
originalmd=md;
viewer.realize();
while(!viewer.done())
{
viewer.getCamera()->setViewMatrix(md);
viewer.frame();
}
}
Edited:- I am having doubt that whether am performing task in proper way i.e i need to move camera but above code translate and rotate object to feel that camera is rotated...many websites says that in opengl there is no camera link(https://www.opengl.org/archives/resources/faq/technical/viewing.htm).
