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.
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.
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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.
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hello, i don't really understand what you want to do. rotating a point in space can be done with rotateXYZ, but this is certainly not the answer you wanted. if you want to move with no rotation around a sphere, then you can use sph2cart object. algebra is quite simple : https://en.wikipedia.org/wiki/Spherical_coordinate
but i don't understand what gemlist_info and gemlist_matrix could have been od any help.
cheers c
Le 06/09/2012 04:53, Max a écrit :
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.
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Cyrille Henry -
Max