Hi,
instead construct a rotation matrix, which rotates by 'delta' degrees, and
multiply it to the current transformation (watch the order of multiplication
!!!).
Best regards
Alex
On Tue, Mar 4, 2008 at 4:39 PM, Patrick Dähne <
[EMAIL PROTECTED]> wrote:
> Hello,
>
> that's a classic one: You cannot do animations like this:
>
> q.getValueAsAxisDeg(x, y, z, w);
> w += delta;
> q.setValueAsAxisDeg(x, y, z, w);
>
> Because there is no one-to-one mapping between rotation and
> quaternion, e.g. the following two quaternions describe the same
> rotation: <x, y, z, w> as well as <-x, -y, -z, 360-w>. When calling
> getValueAsAxisDeg, you'll sometimes get one variant, and sometimes
> you'll get the other variant, which results in the flipping you observe.
>
> Bye,
>
> Patrick
>
>
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