Maya – Basic UV unwrapping

Software:
Maya 2018

Steps for basic UV unwrapping:

  1. Select all polygons.
  2. Apply planar UV projection just to get rid of all the current UV seams.
  3. Select the edges that that are intended to be UV seams.
  4. In the UV Editor menu choose Cut/Sew > Cut.
  5. Select all polygons.
  6. In the UV Editor menu choose Modify > Unfold.
  7. In the UV Editor menu choose Modify > Layout.
  8. Scale and rotate the UV layout to fit the UV space.

Related:
Multiple UV layouts

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Maya Python scripting – Getting an object’s transform matrix relative to another object’s coordinates

Software:
Maya 2018

How to get an object transformation matrix relative to another object’s coordinates:
* The following script requires selecting 2 objects, the function will return the transform matrix of the first object relative to the transform matrix of the second.

from maya.api.OpenMaya import MVector, MMatrix, MPoint
import maya.cmds as cmds

def get_relative_transform (node,coordinate_space_node):
    node_matrix = MMatrix(cmds.xform(node, q=True, matrix=True, ws=True))
    parent_matrix = MMatrix(cmds.xform(coordinate_space_node, q=True, matrix=True, ws=True))
    return (node_matrix * parent_matrix.inverse())

node_a = (cmds.ls(sl=1,sn=True))[0]
node_b = (cmds.ls(sl=1,sn=True))[1]

print (get_relative_transform(node_a,node_b))

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Maya Python scripting – Getting an Object’s world-space transform matrix

Software:
Maya 2018

How to get an object transformation matrix in world space coordinates:

from maya.api.OpenMaya import MVector, MMatrix, MPoint
import maya.cmds as cmds

def get_world_transform (obj):
 return MMatrix ( cmds.xform( obj, q=True, matrix=True, ws=True ) )

selected_object = (cmds.ls(sl=1,sn=True))[0]

print ( get_world_transform( selected_object ) )

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