Rotation Inconsistency...

nakamuram002

In DS 4.8.9.59:

I created a 1m plane.

Pic 1 -- If I rotate in this order: Z90, X45, all the rotations are consistently applied on the local axes.

Pic 2 -- If I rotate in this order: X90, Z45 it appears that the Z rotation is being applied on its global axis.

Can someone tell me how to make object rotations consistent, please?

 

 

 

Richard Haseltine

Rotation is not commutative, at least using the three Euclidean axes.

SpottedKitty

What you're getting is called Gimbal Lock. The easiest fix, if you're manipulating a simple prop, is to create a null and parent the prop to it; that gives you the extra axis of rotation mentioned in the linked Wiki article. Things can get complicated if you're manipulating a body part of a figure, though.

nakamuram002

Richard Haseltine said:

Rotation is not commutative, at least using the three Euclidean axes.

 

Thanks Richard.  I'm not expecting the same result, just consistent behaviour.

nakamuram002

SpottedKitty said:

What you're getting is called Gimbal Lock. The easiest fix, if you're manipulating a simple prop, is to create a null and parent the prop to it; that gives you the extra axis of rotation mentioned in the linked Wiki article. Things can get complicated if you're manipulating a body part of a figure, though.

Gimbal Lock -- Is that a new DS feature or bug?

mjc1016

Neither...it is something I can remember happening in past versions.  And as to being a 'bug'...if you want to count it as a bug in reality, then go ahead. Yes, you are manipulating something that isn't real, but are doing so in a mathematically 'accurate' way.  So, the closer you get to simulating reality, the more real limits and real problems.   And the rotation controls are pretty close to 'real'.