Bug? Incorrect roll axis for ball joint given pitch and yaw

Bug? Incorrect roll axis for ball joint given pitch and yaw

Anonymous
Not applicable
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Bug? Incorrect roll axis for ball joint given pitch and yaw

Anonymous
Not applicable

Is this a bug? When Fusion initializes a ball joint that you've created, it automatically assigns mappings for pitch, yaw and roll to the joint's local origin axes, x, y and ...x? Shouldn't that be x, y, and z?

 

It looks like Fusion makes this error every time: Pitch and roll are always both initially assigned to the x axis. If Pitch is assigned to x, and yaw is assigned to y, then roll should be assigned to the z axis. But it is not, and I don't think you can fix it. At least I can't!

 

Fusion does politely offer a way to let you redefine pitch and yaw to whatever axes you want in the "edit joint" command. However it won't let you redefine roll, because if you properly map pitch and yaw to any two perpendicular axes, then the roll axis can be logically imputed. This is as it should be to reduce errors. But because of this apparent bug there is no workaround that I can identify!

 

They video below was made before I realized this was a more general bug. I was trying to remap pitch yaw and roll to different axes to get my model space to match my meat space, and in doing so, after making the video, I eventually realized the issue is that roll is always mapped incorrectly in the first place and cant be fixed! I tried this in a brand new document file and saw the same behaviours.

 

Thanks!

 
 
 
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jeff_strater
Community Manager
Community Manager

Here is a good thread that contains lots of good information about ball joints and the theory behind them:  ball-joint-mysteries

 

Jeff

 


Jeff Strater
Engineering Director
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Anonymous
Not applicable

Wow. Thanks.

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