It's been a long time since I dealt with quaternions at this level, but if
I understand your question correctly, yeah Maya will reverse the quaternion
once you pass 180. Actually it's not Maya doing that. A quaternion can
distinguish between, say, +270 and -90, but a transform matrix can only
e
Ho I'm sorry ... I just see that the code I sent was not the right one ... I
did some testing and suddenly the code had become anything ...
def slerp_quaternion(m_quaternion_1, m_quaternion_2, f_weight):
"""
!@Brief Apply Spherical interpolation between two quaternions.
@type m_quat
Oh, I should have spotted that before. I think your problem is that you
don't want this bit at all:
if dot < 0.0:
m_quaternion_2.negateIt()
dot *= -1.0
The whole point of that negation is to get the two quaternions within 180°
of each other. If you remove those lines, your quaternions s
Oh it's so simple :(
Thank you very mush !
But effectively after 360° I have a flip again...
I Try to get difference between last rotation and new rotation for add
rotation.
With that I think do not have a problem
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If your dot is >0 in that code, and there are no mistakes, then you
shouldn't get a flip. If you're seeing a flip, my feeling is that you
should be looking for mistakes rather than worrying about the source of the
quaternions. You could print out some numbers.
- I'd expect you to get a dot < 0.0 fr
I just tried this in Maya 2016 and 2018 and it worked in both, so perhaps
this is all moot.
import maya.api.OpenMaya as om
q = om.MQuaternion()
print q
p = om.MQuaternion(0.7,0,0,0.7)
p.normalizeIt()
print p
print om.MQuaternion.slerp(p, q, 0.5, 0)
prints
(0, 0, 0, 1)
(0.707107, 0, 0, 0.707107)
(0
I tried the Maya slerp but the problem is that I do not have access to it
... That's why I tried to do the slerp.
type object 'MQuaternion' has no attribute 'slerp'.
I tried to make the slerp from the eulers. I get the rotation of my
transform and I transform it into quaternion. I do not have a
If you want to post a complete test, with test matrices (or objects) that
show the problem, is be happy to try it and see if I can figure it out.
Why don't you have access to slerp?
On 19 Sep. 2017 4:48 pm, "Rémi Deletrain" wrote:
> I tried the Maya slerp but the problem is that I do not have a
I do not know why I do not have access ... :(
I try with Maya 2014, et 2018...
I'll try to prepare a scene and script that goes with it in the day.
thank you very much for your help !
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"Python Programming for Autodesk
I think I see your problem with accessing the slerp function.
There are two Maya Python "OpenMaya" APIs.
The old one (1.0) is maya.OpenMaya. maya.OpenMaya.MQuaternion does not have
a slerp function.
The new one (2.0) is maya.*api*.OpenMaya. maya.api.OpenMaya.MQuaternion
does have slerp.
The new
I did not risk using it in this case the ... :) The api 2.0 is really
better. I have seen post with people who had a lot of problems with that.
That's why we stayed on the 1.0.
I have not yet had time to make a test scene. I have bee overworked since
the begenning of the week. I do this as soon
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