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Get aggregate transformation resulting from multiple RotateAround operations

Discussion in 'Scripting' started by fahruz, Jul 7, 2021.

  1. fahruz

    fahruz

    Joined:
    Mar 5, 2020
    Posts:
    57
    Transform.RotateAround changes both position and rotation. If the operation is applied iteratively at each update of an object in a script, how can I get the combined aggregate transformation to then apply it to another object (and how)?
     
    fahruz, Jul 7, 2021
    #1

  2. TheFunnySide

    TheFunnySide

    Joined:
    Nov 17, 2018
    Posts:
    192
    You are performing a Matrix multiplication like this. Where R is the rotation arround a point matrix.

    T_newPos = T_oldPos x R; // Rotation repeated every frame

    If you save your matrix somewhere then you can apply it to anything . Note that this matrix contains the angle of rotation which is based on the time since last frame.
     
    TheFunnySide, Jul 7, 2021
    #2

  3. fahruz

    fahruz

    Joined:
    Mar 5, 2020
    Posts:
    57
    Yes, since there doesn't seem to be direct functional support in Unity for that, I was also assuming that I'd have to resort to using the transformation matrix (like probably Matrix4x4.TRS).
    If you or somebody could provide Unity code to do what I described above, that would be awesome.
     
    fahruz, Jul 9, 2021
    #3