Hi Sam, to answer your last question
if you want a different axis to rotate the vector around I probably would
use MQuaternions, like
import maya.OpenMaya as om
from maya import cmds
import math
cube = cmds.polyCube(w=10)[0]
dag = om.MDagPath()
sel = om.MSelectionList()
sel.add(cube)
sel.getDagPath(0,dag)
#
transformFn = om.MFnTransform(dag)
vec1 = om.MVector(0,1,0) # rotation in Y vec
angle = 30
radAngle = math.radians(angle)
quat = om.MQuaternion(radAngle, vec1)
transformFn.setRotation(quat)
vec2=om.MVector(1,1,0)
quat2=om.MQuaternion(radAngle, vec2)
transformFn.setRotation(quat2)
# totates 30 degress about the [1,1,0] vector
vec3 = vec2.rotateBy(quat)
print vec3.x, vec3.y, vec3.z
# vec 3 is the vec2 [1,1,0] rotated 30 degrees in vec1 [0,1,0] axis
# therefore vec3 y value should maitain unchanged while
# vec3 x value becomes cos(30)
# vec3 z value becomes -sin(30)
vec4 = vec1.rotateBy(quat2)
print vec4.x, vec4.y, vec4.z
# vec 4 is the vec1 [0,1,0] rotated 30 degrees in vec2 [1,1,0] axis
## note that if you try to rotate vec1 on quat, or vec2 on quat2 the
resulting vector will be unchanged
## since you are rotating a vector 30 degrees on its own axis...
## like:
vec5 =vec1.rotateBy(quat)
print vec5.x, vec5.y, vec5.z
vec6 = vec2.rotateBy(quat2)
print vec6.x, vec6.y, vec6.z
# cheers
On Wednesday, October 29, 2014 6:20:39 AM UTC-7, sam williams wrote:
hey Pedro, as you can only specify x,y and z axis. Is there a way of using
a specific vector to rotate around? so if instead of y being (0,1,0)
can (-0.12542495647, 0.971342830439, -0.201895235331) be used to represent
the y axis to use in the rotateBy method.
thanks,
Sam
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