[Chimera-users] Feature Request: Expose rotation to python

[Thomas Goddard]

Hi Charlie,

  I second your request for having a Xform.getMatrix() method that
provides 3x4 Numeric array or tuple of tuples.

  I use this a good bit.  My solution is to use the Chimera
PDBmatrices.matrices module which deals with 3x4 matrices where the
first 3 columns are the rotation and the last column is the
translation.  It's been in Chimera for the last couple years
(with ocassional changes).

  Look at Python code

	chimera/share/PDBmatrices/matrices.py

to see what is there.


  Example,

   >>> xf = chimera.Xform.zRotation(30)
   >>> from PDBmatrices import matrices
   >>> m = matrices.xform_matrix(xf)
   >>> print m
   ((0.866025, -0.5, 0.0, 0.0),
    (0.5, 0.866025, 0.0, 0.0),
    (0.0, 0.0, 1.0, 0.0))

There is a chimera_xform() routine to go from matrix to Xform, and
other routines to apply 3x4 matrices to points, or vectors, invert matrices,
multiply matrices, ....

	Tom