Dear Tom,

It looks like a great idea. I will try both options today and let's see of it works for me.

Thanks very much for your advise.

would it be possible to implement to define three more column on the xyz file for standard deviations of Gaussians in each dimensions to calculate the volume data in future releases of the script? Is it technically doable? My localization data have x, y, z and sigx, sigy, sigz.

Bests,

Veysel Berk
Department of Molecular & Cell Biology
University of California, Berkeley


On Aug 5, 2009, at 10:34 AM, Tom Goddard <goddard@cgl.ucsf.edu> wrote:

Hi Veysel,

You will have a rough time trying to open 1 million atoms in Chimera because it is very memory inefficient, taking about 2 Kbytes per atom.  So 1 million atoms will take about 2 Gbytes and this is unlikely to work with 32-bit versions of the program.  Only the 64-bit linux version is likely to handle it.

You are probably better off making a volume data set from your million points.  There is a Python Chimera script called xyzmap.py you can use to do this.

  http://socrates2.cgl.ucsf.edu/trac/chimera/wiki/Scripts

Each point is treated as a Gaussian of specified width.  After making the map you can save it with the volume dialog File / Save Map As... menu entry or the volume command.

Tom

-------- Original Message --------
Subject: [Chimera-users] loading atomic coordinates without drawing or   calculating bonds
From: Veysel Berk
To: chimera-users@cgl.ucsf.edu
Date: 8/5/09 2:52 AM

   Hello,

   I am trying to load a large atomic coordinates file in xyz format.
   The atomic coordinates are meaningless to crystallography in terms
   of distances of atoms and as a result, while chimera try to load
   the coordinate and calculate the bonding between atoms, it crashes
   or suspends for ever. The data is from single molecule
   localization experiments where I want to use chimera to visualize
   this 3D data by treating each localization as an atom. I am trying
   to load about a million atoms.

   Is it possible to turn off automatic bonding calculations and only
   show atoms without bonds to prevent crashing? or does anyone know
   any simple method or software to convert atomic coordinates into
   voxel map which I can use in volume visualizer module of chimera
   without worrying about bond calculations?

   Thanks in advance,

   Bests,

   Veysel Berk

Hi Veysel,

  You will have a rough time trying to open 1 million atoms in Chimera 
because it is very memory inefficient, taking about 2 Kbytes per atom.  
So 1 million atoms will take about 2 Gbytes and this is unlikely to work 
with 32-bit versions of the program.  Only the 64-bit linux version is 
likely to handle it.

  You are probably better off making a volume data set from your million 
points.  There is a Python Chimera script called xyzmap.py you can use 
to do this.

    http://socrates2.cgl.ucsf.edu/trac/chimera/wiki/Scripts

Each point is treated as a Gaussian of specified width.  After making 
the map you can save it with the volume dialog File / Save Map As... 
menu entry or the volume command.

  Tom

-------- Original Message --------
Subject: [Chimera-users] loading atomic coordinates without drawing or   
 calculating bonds
From: Veysel Berk
To: chimera-users@cgl.ucsf.edu
Date: 8/5/09 2:52 AM
  

    Hello,

    I am trying to load a large atomic coordinates file in xyz format.
    The atomic coordinates are meaningless to crystallography in terms
    of distances of atoms and as a result, while chimera try to load
    the coordinate and calculate the bonding between atoms, it crashes
    or suspends for ever. The data is from single molecule
    localization experiments where I want to use chimera to visualize
    this 3D data by treating each localization as an atom. I am trying
    to load about a million atoms.

    Is it possible to turn off automatic bonding calculations and only
    show atoms without bonds to prevent crashing? or does anyone know
    any simple method or software to convert atomic coordinates into
    voxel map which I can use in volume visualizer module of chimera
    without worrying about bond calculations?

    Thanks in advance,

    Bests,

    Veysel Berk