Re: [osg-users] Bizzare setViewMatrixAsLookAt behavior !!
John Galt writes: What is happening is that the eye instead of being fixed at say (X1,Y1,Z1) is revolving around that point in a small circle while pointing to the correct center! See src/osg/Matrix_implementation.cpp, line 922: preMultTranslate(-eye); The origin of the camera is set fixed at the eye point, so if it is not, is because of something else. -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Bizzare setViewMatrixAsLookAt behavior !!
Hi, What is happening is that the eye instead of being fixed at say (X1,Y1,Z1) is revolving around that point in a small circle while pointing to the correct center! Thank you! Cheers, John -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26472#26472 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Bizzare setViewMatrixAsLookAt behavior !!
Hi John, I'm not going to dive into trying to understand your maths, there are plenty of stuff about vector maths on the web as a resource to draw upon that could explain things much better than I could. On the OSG side you have setViewMatrixAsLookAt which is standard gluLookAt behavior, or setViewMatrix(matrix) which again is using straight OpenGL conventions. I would also add that the OSG doesn't directly try to dabble in Euler/HPR coordinate setup as there are so many different ways to interpret them. The OSG provides the maths support in osg::Matrix for you to go an implement things how you like them. Robert. On Sat, Apr 3, 2010 at 3:51 AM, John Galt manu9ak...@gmail.com wrote: Hi, I am using the setViewMatrixAsLookAt to set up my camera. I have set up my camera as follows: viewer.getCamera()-setViewMatrixAsLookAt(osg::Vec3(XCoordinate,YCoordinate,ZCoordinate), osg::Vec3(XCoordinate - 10*cos(osg::DegreesToRadians(Pitch))*sin(osg::DegreesToRadians(Yaw)),YCoordinate + 10*cos(osg::DegreesToRadians(Pitch))*cos(osg::DegreesToRadians(Yaw)),ZCoordinate + 10*sin(osg::DegreesToRadians(Pitch))), osg::Vec3(0.0, 0.0, 1.0)); My XCoordinate, YCoordinate and ZCoordinate values remain constant over the whole code and the values of Roll, Pitch, Yaw change and yet when the Roll, Pitch, Yaw are changed, the position of the camera's eye is being changed. Even though I defined the eye's position as osg::Vec3(XCoordinate,YCoordinate,ZCoordinate). Seems a bit odd for me to understand why this is happening. Thank you! Cheers, John -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26403#26403 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Bizzare setViewMatrixAsLookAt behavior !!
John, you can compose the rotation (roll, pitch, yaw) matrices yourself or have a look at osgSim::DOFTransform documentation. Then, set the position and orientation of the camera with viewer.getCamera()-setViewMatrix(). -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Bizzare setViewMatrixAsLookAt behavior !!
Hi, I am using the setViewMatrixAsLookAt to set up my camera. I have set up my camera as follows: viewer.getCamera()-setViewMatrixAsLookAt(osg::Vec3(XCoordinate,YCoordinate,ZCoordinate), osg::Vec3(XCoordinate - 10*cos(osg::DegreesToRadians(Pitch))*sin(osg::DegreesToRadians(Yaw)),YCoordinate + 10*cos(osg::DegreesToRadians(Pitch))*cos(osg::DegreesToRadians(Yaw)),ZCoordinate + 10*sin(osg::DegreesToRadians(Pitch))), osg::Vec3(0.0, 0.0, 1.0)); My XCoordinate, YCoordinate and ZCoordinate values remain constant over the whole code and the values of Roll, Pitch, Yaw change and yet when the Roll, Pitch, Yaw are changed, the position of the camera's eye is being changed. Even though I defined the eye's position as osg::Vec3(XCoordinate,YCoordinate,ZCoordinate). Seems a bit odd for me to understand why this is happening. Thank you! Cheers, John -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26403#26403 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Bizzare setViewMatrixAsLookAt behavior !!
Redbeard wrote: Hi, I am using the setViewMatrixAsLookAt to set up my camera. I have set up my camera as follows: viewer.getCamera()-setViewMatrixAsLookAt(osg::Vec3(XCoordinate,YCoordinate,ZCoordinate), osg::Vec3(XCoordinate - 10*cos(osg::DegreesToRadians(Pitch))*sin(osg::DegreesToRadians(Yaw)),YCoordinate + 10*cos(osg::DegreesToRadians(Pitch))*cos(osg::DegreesToRadians(Yaw)),ZCoordinate + 10*sin(osg::DegreesToRadians(Pitch))), osg::Vec3(0.0, 0.0, 1.0)); My XCoordinate, YCoordinate and ZCoordinate values remain constant over the whole code and the values of Roll, Pitch, Yaw change and yet when the Roll, Pitch, Yaw are changed, the position of the camera's eye is being changed. Even though I defined the eye's position as osg::Vec3(XCoordinate,YCoordinate,ZCoordinate). Seems a bit odd for me to understand why this is happening. Also, if I know the camera's location(X,Y,Z) and orientation (Roll, Pitch, Yaw), is there any easy function to set the view of the camera instead of doing vector math on paper and setting it up using (eye, dir, up)? Thank you! Cheers, John -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26404#26404 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
