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Question by Steve Edwards · Jul 01, 2010 at 09:27 AM · positionlocalworld

How to define a position local to an object?

Hi

I want to define a position which is 10 units along an object's x-axis. The following sets the position along the world x-axis, how to I modify it for the object axis?

var newPosition : Vector3;
newPosition = myCube.transform.position;
newPosition.x += 10.0;

(I'm not trying to move myCube, I want to instantiate something at the new position)

Thanks

Steve

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Answer by Mike 3 · Jul 01, 2010 at 09:36 AM

TransformDirection is a handy function to change a local offset into a world offset:

myCube.transform.position = myCube.transform.position + myCube.transform.TransformDirection(Vector3(10, 0, 0));
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avatar image Case23 · Jul 01, 2010 at 09:42 AM 0
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Do you realy need the additional "myCube.transform.position +"?

avatar image Mike 3 · Jul 01, 2010 at 10:03 AM 0
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yes - position + offset = new position, same as yours - the only difference is that it's an offset in local coordinates

avatar image Case23 · Jul 01, 2010 at 10:07 AM 0
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Ahh understand. 3Dimensional Vectors sometimes confuse me.

avatar image Steve Edwards · Jul 01, 2010 at 11:23 AM 0
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$$anonymous$$any thanks, TransformDirection works exactly as needed.

avatar image Mike 3 · Jul 01, 2010 at 12:59 PM 0
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Just for completeness - you also have InverseTransformDirection if you want to go the other way

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Answer by Case23 · Jul 01, 2010 at 09:30 AM

myCube.transform.position = myCube.transform.position + new Vector3(10, 0, 0);

should do it.

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