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Thread: null (not) moving by IK-driven Bone? (problems with expression)

  1. #1
    Senior Constrictor Netvudu's Avatar
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    null (not) moving by IK-driven Bone? (problems with expression)

    hi there.
    Attached is a scene with a rigged and animated test arm. Itīs using IK.
    Now, I want to make a null to move around in, letīs say, position X when a bone rotates in Pitch.
    I canīt find a way to do it.
    Even if I use the expression as a motion modifier and check "After IK" the bone wonīt drive anything.

    This should work...but it doesnīt
    The small scene has been packaged into the rar for your convenience. Any ideas?

    ExpressionProblem.rar
    3d animation? Hah! Did you take a look through your window?thereīs plenty of it...and pre-rendered!!

  2. #2
    Goes bump in the night RebelHill's Avatar
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    Twice (sort of) in one morning.

    With expressons you have to sue baking, and afterIK in the expression modifier only works with LScript expressions. Use nodal motion instead.
    LSR Surface and Rendering Tuts.
    RHiggit Rigging and Animation Tools
    RHA Animation Tutorials
    RHR Rigging Tutorials
    RHN Nodal Tutorials
    YT Vids Tuts for all

  3. #3
    Senior Constrictor Netvudu's Avatar
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    Ok, but I try the nodes for driving the displacement and the bone rotation info returns always the same value, no matter the frame...

    EDIT: In fact, it doesnīt matter if I try with Bone Info or Channel info...they both return the same static value...the only way around it is to bake IK rotations?
    Last edited by Netvudu; 04-16-2013 at 05:54 AM.
    3d animation? Hah! Did you take a look through your window?thereīs plenty of it...and pre-rendered!!

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