[Chimera-users] Ribbon path smoothing

Greg Couch gregc at cgl.ucsf.edu
Tue Feb 28 12:40:11 PST 2006

On Tue, 28 Feb 2006, Jakob Toudahl Nielsen wrote:

> I trying to create a ribbon model drawing of a DNA structure containting 
> several abrupt chain-reversals in the DNA-backbone. By default the 
> ribbon path is smoothed over five successive residues. This resuls in 
> the ribbon path supressing the chain-reversals by oversmoothing the 
> path. Is there any way to overide the default value of the FIVE 
> succesive residues to a smaller number (e.g. TWO).

So the short answer is not yet.  We had noticed the problem with RNA, 
where tight turns are more common, and have started working on a solution, 
but it is not done yet.  The smoothing is over 4 residues and can not be 
easily changed.  But we can use different kinds of splines to vary how 
close the ribbon gets to each residue.  And that is the solution we're 
working on.

 	Greg Couch
 	UCSF Computer Graphics Lab

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