using local translations to move to a point in global space
Posted on 1998-09-11
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
01 X goal poin
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.