Dear all,
I've noticed that when using transformation matrices to rotate a
molecule in Nucleic Acid Builder, the x-rotation appears to left handed,
while the y- and z-rotations are right handed. This seems like a rather
odd convention; is there a particular reason for this behavior, or am I
simply missing something?
Here is what I did:
1) I created a DNA helix using wc_helix (the helix starts out along the
positive z-axis).
2) I then moved the helix to find where the x,y and z unit vectors point
(each transformation was applied to a copy of the original helix):
newtransform( 20.0, 0.0, 0.0, 0.0, 0.0, 0.0);
newtransform( 0.0, 20.0, 0.0, 0.0, 0.0, 0.0);
newtransform( 0.0, 0.0, 20.0, 0.0, 0.0, 0.0);
3) I tried rotating the helix (again, each transformation was applied to
a copy of the original untranslated helix):
newtransform( 0.0, 0.0, 0.0, 45.0, 0.0, 0.0);
newtransform( 0.0, 0.0, 0.0, 0.0, 45.0, 0.0);
newtransform( 0.0, 0.0, 0.0, 0.0, 0.0, 45.0);
The second and third rotations are right handed with respect to the y-
and z- unit vectors, but the first is left-handed with respect to the
x-unit vector.
Thanks in advance,
Chaitanya Murthy
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Received on Mon Aug 26 2013 - 19:30:02 PDT
