Hey guys. long time lurker, first post...
I posted this over on stack overflow, but I think this might be a better
place for it..
I am creating a toolset for creating nurbs curves/surfaces inside maya
using python.
I have a set of dictionaries that include cvPositions, knots, form etc.
each of which describe a preset 3d shape (cube, circle, pyramid etc). I
also have a 3d matrix stored in the nodes metadata that is used as an
offset for the shape. This allows you to scale/move/rotate the shape
without moving the transform.
The problem is in the way I am applying this matrix is very slow:
First I will create a new (edit)transform at the position of the
(orig)transform containing the curves. Next I will transfer cv positions in
world space from (orig)transform to (edit)transform. Next i will move the
(edit)transform into the matrix position. Finally I will world space
transfer the cvPositions back to the (orig)transform
When creating hundreds of shapes, this is becoming prohibitively slow...
Can someone describe a mathematical way to apply a matrix to a set of 3d
points? maybe using one of pythons math modules or perhaps numpy?
Alternatively,
Is there a way using OpenMaya api functions to do this? Perhaps with
MPointArray? The following code block is about as far as I have gotten on
that front:
cheers,
-Paxton
crv = OpenMaya.MFnNurbsCurve( self.dagPath )
cvs = OpenMaya.MPointArray()
space = OpenMaya.MSpace.kWorld
crv.getCVs(cvs, space)
positions = []
for i in range(cvs.length()):
pt = cvs[i]
positions.append( (pt[0], pt[1], pt[2]) )
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