Here the math bases http://bookofhook.com/mousepick.pdf
Here the script that I have written for another engine, I hope that
help, it should be easy to understand ;)
function VRCamera::unProject(vx, vy, vz)
{
var tempVector = vector(3);
var clip = vector(4);
var view = vector(4);
tempVector.x = vx;
tempVector.y = vy;
tempVector.z = vz;
//View to Clip
clip.x = 2.0 * (tempVector[0]-m_viewPort[0])/m_viewPort[2] - 1.0;
clip.y = 2.0 * (tempVector[1]-m_viewPort[1])/m_viewPort[3] - 1.0;
clip.z = 2.0 * tempVector[2] - 1.0;
clip.w = 1.0;
//Clip to view
view.x = clip.x / projectionMatrix[0];
view.y = clip.y / projectionMatrix[5];
view.z = clip.w / projectionMatrix[11];
view.w = clip.z / projectionMatrix[14] - clip.w *
projectionMatrix[10] / (projectionMatrix[11] * projectionMatrix[14]);
//Normalization
view /= view.w;
// View to Global
return matrixMultiplyVector_4(matrixInverse_4(m_cachedMatrix),
view); //cachedMatrix is the model view matrix
}
why nobody have written an unProject function for the osg::Camera? o.O
Ruqin Zhang ha scritto:
Hi, I got a problem when implementing code to transform from screen
coordinate to world coordinate.
Here is the code:
void ASDSPickHandler::pick(const osgGA::GUIEventAdapter &ea,
osgViewer::Viewer *viewer)
{
......
osg::Vec3f primitivePosition(ea.getX(), ea.getY(), 0.0f);
osg::Matrix viewMatrix = viewer->getCamera()->getViewMatrix();
osg::Matrix projectionMatrix =
viewer->getCamera()->getProjectionMatrix();
osg::Matrix windowMatrix =
viewer->getCamera()->getViewport()->computeWindowMatrix();
osg::Matrix cameraMatrix = viewMatrix * projectionMatrix *
windowMatrix;
osg::Matrix inverseCameraMatrix;
inverseCameraMatrix.invert(cameraMatrix);
primitivePosition = primitivePosition * inverseCameraMatrix;
......
}
Here, the output of "primitivePosition" seems not correct. Just don't
know what happened. Can you guys help me out? Thanks in advance!
Ruqin
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