Hi All.
Not really a question specific to Python in Maya, but I am trying to
write this in python, and know that there are quite a few experienced
maya people on the list.
I was wondering if there was possibly a better way to do this.
I am querying a point on a surface, to get a normal vector, then
trying to use this vector to orient an objects rotation matrix so that
it points in the direction of surface.
I have written my own method to apply the transform as .setTransform
in pymel doesn't seem to work:
def mySetMatrix(anObject, aMatrix):
select(anObject)
xform(m=(aMatrix.a00,aMatrix.a01,aMatrix.a02,aMatrix.a03, \
aMatrix.a10,aMatrix.a11,aMatrix.a12,aMatrix.a13, \
aMatrix.a20,aMatrix.a21,aMatrix.a22,aMatrix.a23, \
aMatrix.a30,aMatrix.a31,aMatrix.a32,aMatrix.a33))
I query the point on the surface with:
normalVector = aMesh.getClosestNormal(aPoint, 'world')[0]
and then use the X,Y,Z values of this vector to calculate the
following matrices:
rotate on x axis:
where X = atan2(Y,Z)
1 0 0 0
0 cosX -sinX 0
0 sinX cosX 0
0 0 0 1
rotate on y axis:
where Y = atan2(X,Z)
cosY 0 sinY 0
0 1 0 0
-sinY 0 cosX 0
0 0 0 1
rotate on z axis:
where Z = atan2(Y,X)
cosZ -sinZ 0 0
sinZ cosZ 0 0
0 0 1 0
0 0 0 1
and then assigning the resulting matrix (original Matrx) X (X Matrix)
X (Y Matrix) X (Z Matrix) to the original object.
Although this approach seems to make sense to me on paper, when I
implement it, I get matrices that end up scaling the object instead of
only affecting its rotations, and they point in the wrong directions.
I was wondering if anyone could point me in the right direction with
this one (literally :P ) ?
Regards,
Adam Miels.
--
http://groups.google.com/group/python_inside_maya
