Thanks for the reply. Unfortunately, setMatrix appears to be broken in my
install of pymel (maya 2011). (See
http://tech-artists.org/forum/showthread.php?1620-pymel-setMatrix() )
But that's beside the point, as the only thing it would prove is that
matrix inversion and matrix-matrix multiplication works. I'm trying to
apply a matrix to a vector (actually, about 60,000 of them), and I'm not
getting the expected results. Unless there's something obvious that I'm
missing, which is entirely possible.
What I want to do is transform an arbitrary point into the object space of
a an arbitrary object. Shouldn't my code above achieve that?
On Wednesday, August 1, 2012 12:06:20 AM UTC-4, Geordie Martinez wrote:
>
> Try this:
> import pymel.core as pm
>
> sphere = pm.PyNode("pSphere1")
>
> sphereM = sphere.worldMatrix.get()
>
> sphereInvM = sphereM.inverse()
>
> sphere.setMatrix(sphereInvM * sphereM)
>
>
> On Tue, Jul 31, 2012 at 5:31 PM, meeotch wrote:
>
>> Hopefully someone can tell me how I'm screwing this up...
>>
>> 1) create a sphere, translate it away from the origin
>> 2) m = PyNode("pSphere1").worldMatrix.get()
>> 3) v = PyNode("pSphere1").translate.get()
>>
>> So far, so good - m looks like a reasonable matrix, v is the position of
>> the sphere. So now:
>>
>> 4) m.inverse() * v (or maybe the other way around)
>>
>> Shouldn't that give (0,0,0) ? I.e., transforming the position back to
>> the origin. Or is matrix*vector multiplication not implemented?
>>
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