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joint orientation (3 posts)

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  1. Rie

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    Member
    Posted 7 years ago
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    Hi, I'm always a little confused about joint orientation. I read some books and articles about it, but still cannot fully understand it. Sometimes people said it should be X down the joint, Z rotating towards the front. And some said orient joints with Y down the joint, Z sideways.

    Can someone elaborate a little bit more about joint orientation?
    Does twist axis and roll axis means the same?

    thx!

  2. CharacterTD_blog

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    Member
    Posted 7 years ago
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    It really just has to do with preference. You have three axis to choose from, it's just kind of standard practice to use x-axis pointing down the chain, (kind of like people using i as a variable in a for loop if you know any programming). As far as the difference between twist and roll, I think it again is just what it sounds like, but people call it different things. But in my mind, twist will be on the axis pointing down the chain(like an arm twist). I could be wrong.

  3. Javier "Goosh" Solsona (admin)

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    Key Master
    Posted 7 years ago
    #

    There is a bit of legacy for the down axis. It used to be that you could only use one and not the others for certain things. I don't think that's the case anymore so you can pretty much use whatever.

    It ends up being what your pipeline is used to

    twist and roll will depend on the joint. a wrist might have a different one than an elbow or a shoulder.

    Hope that helps

    Javier

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