[PD] Gem gemlist_info and gemlist_matrix

Cyrille Henry ch at chnry.net
Thu Sep 6 00:06:00 CEST 2012

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.


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.
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