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