Particle Transformation Matrix

[hansesurfer]

when a particle object has been created with only one particle , at some coordinates which are not the world 0,0,0, then its worldMatrix attribute gives wrong values.
Because after particle object creation, the transformation matrix always points to 0,0,0.

Has anybody a idea what I can do to make the transformation matrix point to the created particle?

thanks!

[joojaa]

why the hell would you need this?

[hansesurfer]

I need that for some calculation with the world coordinates of the particle (API).

The funny thing is, that the transformation nodes that are above the particle node (those are locators) got also wrong world matrix values. Somehow the particle node influenced the nodes above in the hierarchy...

so, any idea, Joojaa?

[joojaa]

The data is not yet refreshed. Do you create the nodes in the api too? are you making a node.

[hansesurfer]

the nodes have been created long ago ( months ).
But now I need their world coordinates.
If I cannot get their true coordinates, I would have to create the
whole hierarchy once more, and that would take me some fair amount of time...

[joojaa]

Yes but you do understand that maya does not refresh values unless you actuallly push them to something that purposefully needs them thsus the values can be out of sync when you deal with them in the api wrong. This si the huge advantage of using api code in first place but also part of why its so hard to break into the api.

You wouldn't be the first one who made nodes just to notice theydont work right 3 months later because you didnt know some of the standard issues with maya dg and how to test it properly. Hell even i cant do that right half of the time at first go.

But ok let us assume because i know you not to jump to conclusions this is a bug in maya itself then what version of maya are you using and ill test to replicate this sometimes tomorrow.

[hansesurfer]

Currently i got Maya2008. In some days it`ll be 2009.

Its not just a update problem. After "getAttr" the value is the same..

thanks joojaa!

p.s.
I wouldnt say its a bug. Its just that Maya doesnt assume you to make just one particle in a particle object, so the "wisest" decision is to let the transformation matrix just stay at 0,0,0, regardless of how many particles were made and where they stay.
But it might be a bug, that the parent transforms get influenced by the child particle object...

[hansesurfer]

okay, I cannot reproduce the effect that the transforms above the particle node get their matrix screwed up. So, this must have happened in a step I don`t remember...sorry, this is no bug here...joojaa

anyway, may there be any chance to relocate the transform matrix to the particles pivot point without changing the location of the particle shape?
How may I do that with mel?