Weird rotation problem

Deke

Sometimes when animating a figure in Daz, the rotation Paremeters sliders don't work. For instance, the X and Z sliders will both only adjust one axis and not the other. When I try to override this malfunction by using the rotate tool and dragging one ring or another, the axis are controlled properly, but when rendering that animation the figure moves and flips in a very erratic manner. Any ideas on what's going on here?

crosswind

Not sure what you want but you may check in Tool Settings pane... which coordinates system you're using...

LeatherGryphon

Is it more than just gymbol lock?

Deke

Thanks, but I wouldn't know how to lock a gymbol. The tools pane says I'm using Local Coordinates...whatever that means.  Just strange that the Z slider in Parameters would move the object the same as the X slider. 

Richard Haseltine

Gimbal lock - rptations apply in order and when you rotate the bone the later rotations get their axes rotated too, so it is possible for two of them to end up overlapping. using World Coordinates will block that effect, at the expense of making the rotations not line up with the bone as the local coordinates do - but that affects the Viewport gizmo, not the sldiers (DS then translates the World-coordinate rotations to local). This is why the standard advice for setting rotation order is twist first, then the axis that is least likely to hit ninety degrees, then the last axis as that reduces the chance of gimbal lock.

murgatroyd314

90 degree rotations in particular are likely to cause problems.

https://en.wikipedia.org/wiki/Gimbal_lock

marble

Deke said:

Sometimes when animating a figure in Daz, the rotation Paremeters sliders don't work. For instance, the X and Z sliders will both only adjust one axis and not the other. When I try to override this malfunction by using the rotate tool and dragging one ring or another, the axis are controlled properly, but when rendering that animation the figure moves and flips in a very erratic manner. Any ideas on what's going on here?

 

I've experienced that odd thing where the x and z sliders rotate identically. I also switch to the Universal Tools when that happens. However, I have seen a completely separate problem during animations when the whole figure spins like a chicken on a spit. This is apparently due to having hip rotations in excess of 90 degrees. The only thing I can do in those cases is to re-pose the figure using the root (whole figure) rather than the hip rotations. This is something I've complained about for years and logged with support without any resolution.

crosswind

I ever experienced the similar issue as marble had, though it did not come from animation but just a couple of pose packs. It was pretty cumbersome to manipulate poses with Hip bone has rotations. So OP better check figure's hip bone as well...

Deke

Thanks for the information. Very helpful and I'll give it a try. 

Deke

Even using World Coordinates, it's still difficult to animated this character swaying back and forth. Rather than tilt a few degree, it will to a 360 degree rotaion onto it's face, through the ground plane, and back up again.