[Bf-animsys] About rotation limits beyond +/- 180 degree

Joshua Leung aligorith at gmail.com
Sun Sep 21 13:08:58 CEST 2014


By and large, this is a well known limitation of the constraints system ,
which I've documented extensively multiple times and also in various bug
reports every time this comes up. Heck, IIRC, it's even on the todo/known
limitations list.

There is also an open report on the tracker regarding issues like this. For
once, I haven't closed this,
since I do have a new idea about how to attack this. However, before anyone
gets their hopes up that these issues will get solved soon, I must warn
that this solution may very well be a bit of a flop. As for when you can
expect to see this - it'll currently need to wait till early-mid November.


On Sun, Sep 21, 2014 at 10:45 PM, Gaia <gaia.clary at machinimatrix.org> wrote:

> Hi;
> I found a question on blender.stackexchange about bone rotation limits.
> http://blender.stackexchange.com/questions/16055/bones-constraint-limit-x-axis-rotation-more-than-180%C2%B0-doesnt-work
> I was curious and looked into that. And i found that indeed setting the
> limits > 180 does not work from a user point of view.
> http://www.pasteall.org/pic/show.php?id=77446
> Here the pink range can not be reached  although it is in the defined
> limits range. Instead of that the bone flips back to 0 when user tries
> to rotate beyond 180 although the limit range would allow that.
> The wiki documentation does not mention this behavior:
> http://wiki.blender.org/index.php/Doc:2.6/Manual/Constraints/Transform/Limit_Rotation
> Now my question is:
> - is it a bug ? (then imho it should be fixed)
> - or is it a limitation ? (then it should be documented)
> Actually from a user point of view setting the limits to values > 180
> could make a lot of sense. The behavior of the constraint then seems
> somewhat "unexpected". So if this is a limitation that can not be
> avoided, then what about limiting the input values for the limit ranges
> to -/+ 180 ?
> What do you think ?
> cheers,
> Gaia
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> Bf-animsys at blender.org
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