osgearth屏幕坐標定義？

#define M(row,col) m

void Transform_Point(double out, const double m, const double in){

out = M(0, 0) * in + M(0, 1) * in + M(0, 2) * in + M(0, 3) * in;

out = M(1, 0) * in + M(1, 1) * in + M(1, 2) * in + M(1, 3) * in;

out = M(2, 0) * in + M(2, 1) * in + M(2, 2) * in + M(2, 3) * in;

out = M(3, 0) * in + M(3, 1) * in + M(3, 2) * in + M(3, 3) * in;

}

osg::Vec3d WorldToScreen(osgViewer::View* view,osg::Vec3 worldpoint){

double in, out;

in = worldpoint._v;

in = worldpoint._v;

in = worldpoint._v;

in = 1.0;

//獲得當前的投影矩陣和模型視圖矩陣

osg::Matrix projectMatrix= view->getCamera()->getProjectionMatrix();

osg::Matrix viewprojectMatrix = view->getCamera()->getViewMatrix();

//下面計算 模型視圖矩陣 * 投影矩陣 * 視口窗口變換矩陣

double modelViewMatrix;

memcpy(modelViewMatrix,viewprojectMatrix.ptr(),sizeof(GLdouble) * 16);

Transform_Point(out, modelViewMatrix, in);

double myprojectMatrix;

memcpy(myprojectMatrix,projectMatrix.ptr(),sizeof(GLdouble) * 16);

Transform_Point(in, myprojectMatrix, out);

if(int(in * 100000) == 0){

return osg::Vec3d(0,0,0);

}

in /= in;

in /= in;

in /= in;

int viewPort;

osg::Viewport* myviewPort = view->getCamera()->getViewport();

viewPort = 0;

viewPort = 0;

viewPort = mConfigure->GetScreenWidthPixel(); //橫向象素點

viewPort = mConfigure->GetScreenHeightPixel();//縱向象素點

//計算 三維點在屏幕上的二維投影點

osg::Vec3d sceenPoint;

sceenPoint._v = (int)(viewPort + (1 + in) * viewPort / 2 + 0.5);

sceenPoint._v = (int)(viewPort + (1 + in) * viewPort / 2 + 0.5);

sceenPoint._v = 0;

return sceenPoint;

}