Hello folks, I am using parallel projection and using screen scale to simulate zooming. I need to be able to project a ray into the scene to perform some intersection algorithms when the user clicks. To do this I am simply moving the mouse point to the image plate and from the image plate to the vworld, then doing a cross product of vectors on the image plate to get a ray perpendicular to the image plate.
All this is working well, except that the z-value of the mouse point in the virtual world appears way off. My guess is that the mouse point is being scaled by the screen scale in some way, but I can't find any documentation on this. Why would a 0 Z value on the image plate cause the point to be scaled to past the origin in the vworld? Can someone shed some light on it? View Platform Pos: (0, 0, 1.9113696E7) Screen Scale: 1.6939778031045968E-8 Eye in image plate: (0.15155333333333335, 0.1347611111111111, 0.2957036069575117) Mouse in image plate: (0.12474222222222223, 0.17610666666666666, 0.0) Eye in vworld: (-1.862645149230957E-9, 0.0, 2.5484928E7) Mouse in vworld: (-2333981.1361973807, 3599244.5942412186, -256886.19353172183) Imageplate to Vworld: 8.705275684117863E7, 0.0, 0.0, -1.319313547513676E7 0.0, 8.705275684117863E7, 0.0, -1.173132623720261E7 0.0, 0.0, 8.705275684117863E7, -256886.19353172183 0.0, 0.0, 0.0, 1.0 Is there a simple way to get coplanar with the image plate to be on the view platform? Thanks, -mike =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
