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Get local transform info from non-child

Discussion in 'Scripting' started by wwu39, Jan 24, 2022.

  1. wwu39

    wwu39

    Joined:
    Nov 21, 2018
    Posts:
    25
    So I have 2 objects: A and B. How can I get A's local position and rotation related to B as if A is a child of B without actually making A a child of B?
     
    wwu39, Jan 24, 2022
    #1

  2. MelvMay

    MelvMay

    Unity Technologies

    Joined:
    May 24, 2013
    Posts:
    10,546
    Given A & B are Transform components then this should work (not tested):
    Code (CSharp):
    1. var localPosA = B.InverseTransformPoint(A.position);
    2. var localRotA = Quaternion.Inverse(B.rotation) * A.rotation;
    ... although this doesn't calculate scaling but you didn't mention that. You can set the A local scale to be the reciprocal of the B lossyScale (1/lossyScale) * A lossyScale.
     
    MelvMay, Jan 24, 2022
    #2
    Bunny83 likes this.

  3. wwu39

    wwu39

    Joined:
    Nov 21, 2018
    Posts:
    25
    Thought I would need some math tutoring. Turns out Unity did math for me!
     
    wwu39, Jan 27, 2022
    #3