You could implement slerp function:
import math
def quaternionSlerp(a, b, t):
cos = quaternionDot(a, b)
if cos < 0.0:
cos = quaternionDot(a, b.negateIt())
theta = math.acos(cos)
sin = math.sin(theta)
if sin > 0.001:
w1 = math.sin((1.0 - t) * theta) / sin
w2 = math.sin(t * theta) / sin
else:
w1 = 1.0 - t
w2 = t
aa = OpenMaya.MQuaternion(a)
bb = OpenMaya.MQuaternion(b)
aa.scaleIt(w1)
bb.scaleIt(w2)
return aa + bb
def quaternionDot(q1, q2):
return (q1.x * q2.x) + (q1.y * q2.y) + (q1.z * q2.z) + (q1.w * q2.w)
On Tue, Oct 4, 2011 at 2:47 PM, David Moulder <[email protected]>wrote:
> I don't know if slerp is correctly exposed but I can tell you that there is
> a new api binding available in 2012. Maya API 2. Its a faster and more
> friendly python api and the docs suggest that slerp is exposed correctly.
>
>
> On Tue, Oct 4, 2011 at 5:26 PM, a_adam <[email protected]> wrote:
>
>> Hi there,
>>
>> just joined in here, and I'm looking forward to some good discussions!
>> And of course I stumbled into a problem today which brought me here in
>> the first place: I can't for the life of me trigger the slerp function
>> from the MQuaternion class.
>>
>> The API docs tell me that there are two slerps (odd enough), one
>> considering spin and being marked as not exposed to scripting, and a
>> simple one without a spin argument which should be accessable to
>> scripting. It is this simpler version which I'm trying to get to work.
>>
>> I've seen in this group's archive that slerp indeed does not seem to
>> be not implemented in the Python wrapper. However, that post is over a
>> year old, and I asked myself if Autodesk did anything for Maya 2012 to
>> make this work? Or anyone found a workaround in the meantime?
>>
>> Many thanks in advance for a quick hint, cheers!
>>
>> -Andre
>>
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>
>
>
> --
> David Moulder
> http://www.google.com/profiles/squish3d
>
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