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using local translations to move to a point in global space

micah
micah asked
on
Medium Priority
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Last Modified: 2012-05-04
I have a figure that I need to slide to a point.  The problem is this figure slides in its local corsys.  So the point in world coordinates may be (4,-7) away but I need to slide the device (2,8) in its coordinates.  My question is how do I find that local translation?  All this is done in 4x4 matrices.  I guess it has to do with get the destination point into the devices coordinate system, which I am also not sure how to do.  Below is a diagram that might help
 
 y  
10
09    
08   x
07  /
06  p
05   \
04    y
03                    
02                  
01                  X goal poin
00                  
  1 2 3 4 5 6 7 8 9 10 x


So you can see that in world all I need to do is slide p 8 in X and -5 in Y.  But I need to use p local coordinates and slide it in x or y.  So it should be something like 7 in y and 2 in x.  All the values I am working with are in 4x4 matrices.

Thanks
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ozo
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Commented:
What do you know about yhe relationship between world coordinates and device coordinates?
Commented:
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