Hi Tom, can you send me the session? Having difficulty understanding what you did. I thought I did the same. When I create a inverted matrix -1[000] and read it in using a matrixset command, it immediately transforms it to a 2[001] matrix, that is it it creates a positive one for z. What I would expect for a m[001] matrix interpolating from an identity matrix using a reset command of 100 frames is the object would flatten out or scale from 1 to 0 on the z axis from frames 1-50, and invert 50-100, returning to full scale, but inverted at frame 100. I should be able to do this in Blender, but would rather do it in Chimera. thanks, Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ________________________________________ From: Tom Goddard [goddard@sonic.net] Sent: Monday, September 26, 2011 12:36 PM To: Dougherty, Matthew T Cc: chimera-users@cgl.ucsf.edu Subject: Re: [Chimera-users] matrices 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