[Chimera-users] technical questions about volume viewer in chimera

Tom Goddard goddard at sonic.net
Wed Sep 15 17:46:37 PDT 2010

  Hi Alex,

   Chimera reads the voxel size and map grid size from the headers of 
each of the volume file formats it reads.  Often the correct voxel size 
is not given in the files and is set to 1.0.  If it the file has zero 
(or negative) for the voxel size than Chimera uses of size of 1.  You 
can change the voxel size within Chimera using the volume dialog 
Coordinates panel.  Then you can save a new file with the volume dialog 
File / Save Map As... menu entry.

> Hallo
> Perhaps, this has been on the forum before, but I could not find the
> answers to
> my questions:
> 1. Some EM density maps have a header. I wonder how Chimera recognizes
> it and calculates map dimensions?
> 2. Does chimera take default voxel size from header of EM file?
> Thanks in advance
> Alex

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