bonjour cyrille, I see, so it's because i'm messing with the view message to change the angle towards the object in my gem scene. So gemlist_info is always referring to the camera in gem, that's important to understand and it means i can't use it what I thought I'd use it for. Actually I just wanted to rotate a point in the space and I was too lazy for the algebra. There must be some abstractions for that and I think I saw some in the PdMtl… tomorrow.
bonne nuit, m. Am 06.09.2012 um 00:06 schrieb Cyrille Henry: > hello Max, > > about gemlist_info : > on gemlist_info help patch, the default position is 0 0 -4, rotation, and > shear are 0 0 0, size is 1 1 1. > changing the translate to 0 0 4 result having the gemlist_info position to 0 > 0 0. > adding the rotation before the translation will result in a different > translation (because it was rotated). So the position will not be 0 0 0 any > more. > > since the 1st transformation comes from the camera position and rotation, > playing with camera position can result in the value you describe. > > > > about gemlist_matrix : > > this object output a 4x4 matrix. but since pd did not have a native matrix > type, the 16 float are output as a list. > > cheers > c > > > Le 05/09/2012 23:46, Max a écrit : >> dear list, >> >> i'm wondering how the gemlist_info and gemlist_matrix objects work. >> gemlist_info for instance has a default position of x, y, z: 0, >> -2.38419e-07, -13.0551 >> which i found strange, so i thought i'd add a translateXYZ 0 2.38419e-07 >> 13.0551 before the gemlist_info to get reset the position to zero. but then >> i get 7.30032, -10.4295, -10.1628 >> that seems very strange to me can someone enlighten me? >> the gemlist_matrix-help seems very incomplete, it doesn't explain what >> difference of the matrix and the list is and what the output values $1…$15 >> are. >> >> thanks, >> m. >> >> >> >> _______________________________________________ >> Pd-list@iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
