[Chimera-users] matrices

[Tom Goddard]

Hi Matt,

   You can use an inversion or inversion combined with a rotation in 
Chimera and at least some things work correctly.  I tried the matrixset 
command to apply an inversion and the inverted molecule displayed and 
rotated correctly, and then I created a surface for the inverted 
molecule which worked.  When I then tried to align the inverted molecule 
to a copy of the original uninverted molecule, it inverted it back to 
give perfect alignment (didn't just do the best pure rotation).

   As far as I know, no thought has gone into making sure Chimera works 
with inverted spatial transformations, so some operations with inverted 
models may misbehave and you'll have to test and see.

     Tom


Dougherty, Matthew T wrote:
> I was doing something with crystallographic point group matrices.
>
> Does Chimera allow for improper rotations and inversions?
> Or does it rectify them as proper rotations?
>
>
> I would like to go from
>
> Model 0.0
> 	1 0 0 0
> 	0 1 0 0
> 	0 0 1 0
>
> TO
>
> Model 0.0
> 	-1  0  0  0
> 	 0 -1  0  0
> 	 0  0 -1  0
>
>
>
> Matthew Dougherty
> National Center for Macromolecular Imaging
> Baylor College of Medicine
>