WorldViz User Forum - A point in avatar's coordinate system

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omidbrb

05-14-2009 05:23 AM

A point in avatar's coordinate system

Hi,

This is probably a very simple question but I couldn't find a simple function to calculate that in vizard. How can I find the position of a point that we have it in global coordinate system with respect to some object's coordinate system (specifically an Avatar's local coordinate system) ?

Thanks a lot,
Omid

Gladsomebeast

05-14-2009 11:34 AM

Code:

#easy way

target = viz.addGroup(pos=[1,0,1])

root = viz.addGroup(pos=[6,1,3])

helper = viz.addGroup(parent=root)

helper.setPosition(target.getPosition(), viz.ABS_GLOBAL)

print helper.getPosition() #mode defaults to viz.ABS_PARENT



#mathy way

#T=OR so T(1/R)=0

T = target.getMatrix()

R = root.getMatrix()

O = T * R.inverse() 

print O.getTrans()

omidbrb

05-15-2009 05:39 AM

Thanks a lot. I'll try the solutions.

I'm wondering why it wasn't written in the documentation that the viz.addGroup function accepts the "pos" parameter.

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