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Joints Twisting:

J450NP13
Advisor

Joints Twisting:

J450NP13
Advisor
Advisor

I have a simple rig.  Parent joint is parented to a base and there's a middle joint and another joint.  acting like a shock absorber ...using the aim constraint.  But when the parent joint is rotated the entire rig rotates 180 degrees. 

 

What would cause this.  I have never had this issue before.

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mujuningaiza
Advocate
Advocate

Which parent method you used? Normal parenting (P) or parent constrain? And what aimed at? a joint or another object in Maya scene like NURBSCurve?

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J450NP13
Advisor
Advisor

I have three joints the ones on the ends are pointing at locators that are parented to two different objects then the end joints locator is aiming at the main joint.

 

Does that make sense?

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J450NP13
Advisor
Advisor

I attached a test file.  Select the upper box and move it with the rotation tool...I offset the pivot to simulate what I have going on.

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J450NP13
Advisor
Advisor

Oh...I just hit "p"

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mujuningaiza
Advocate
Advocate

If you would explain what you intend for would be better may be I can come with a solution, aim constrain means look at, thus joint 1 is looking at joint 3, joint 2 is parented to joint 1 so following child (joint 2) is following joint 1 actions but its has no any input connection so you can create even it's constrain like point/parent to prevent that behavior.

 

Second qn why you have two constrains on joint 1? 

 

Hope you get an idea

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J450NP13
Advisor
Advisor

It is a telescopic joint rig. for a mechanical arm.  this is for the hydraulics element that works the "elbow" of the arm.

 

I have done this many times before....and sometimes this happens but redoing it fixes the issue...this time it won't stop doing it...so I figured I need to find out what I am doing to make it happen.

 

It is pointing at the locator that is parented to the section of arm....because obviously it needs to point to a specific spot to stay in position.  Then the aim constraint between the moving locator and joint one.

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J450NP13
Advisor
Advisor

Hope I get an idea?  I have done this hundreds of times before....all of a sudden I am getting this twisting/rotation.  There is two different kinds of constraints on joint one.

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mujuningaiza
Advocate
Advocate

Problem solved?

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J450NP13
Advisor
Advisor

No...I have rigged another model the same way and it doesn't twist like that...not sure what the deal is.  Could it be something with the scene?  

mujuningaiza
Advocate
Advocate

IDK y Maya act like that, might be a scene same way happenen to me for different scenes, imoprting and re-opening don't solve. Maya got bugs, sometimes can swallow your mood.

 

Yet Maya remain my extension of my LIFE Smiley Sad

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