Ying, I think your multiplication order is backwards; try pos1 = P1 * modelviewMat * projectionMat;
Glenn Waldron / @glennwaldron On Thu, Jul 24, 2014 at 10:01 AM, ying song <[email protected]> wrote: > Hello everyone, > > To understand what is the clipping coordinates, I tested some points using > the following code: > > osg::Matrixd modelviewMat= viewer->getCamera()->getViewMatrix(); > osg::Matrixd projectionMat= viewer->getCamera()->getProjectionMatrix(); > osg::Vec4 pos1 = projectionMat * modelviewMat * P1; > > According to the documents I found, the clipped coordinates > (pos1.xyz()/pos1.w()) should be in the range of (-1,1). But some of the > coordinates that I calculated is out the this range. For example, I got: > pos1=[4.3364410, -0.95071518, -32.184357, 2.3291125], so pos.x/pos.w and > pos.z/pos.w are out of the range. > > Also, I don't understand what is the z coordinate means in the clip > coordinates. How could I get the window coordinates from the clip > coordinates? Are the window coordinates equal to: > [(pos.x/pos.w+1)/2*window_width,(pos.y/pos.w+1)/2*window_height] ? > > Thank you! > > Cheers, > ying > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=60438#60438 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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