# [Chimera-users] axis - length

Catherine Jenifer Rajam Rajendran catrajen at umail.iu.edu
Mon Jul 17 08:11:11 PDT 2017

```Hi Elaine,

I am able to stretch the axis now! Thank you so much!

- Catherine

On Fri, Jul 14, 2017 at 7:28 PM, Elaine Meng <meng at cgl.ucsf.edu> wrote:

> Hi Catherine,
> It’s just standard geometry to find the second point farther away on the
> same line.  First you would need to know how much longer you want the line
> (cylinder).  If the two points that you have now are are x1,y1,z1 and
> x2,y2,z2, find
>
> a = x2 - x1
> b = y2 - y1
> c = z2 - z1
>
> Then multiply a,b,c by the factor (if you want 2x as long, multiply by
> two) and add them back to x1,y1,z1 to get the new other end of the cylinder.
>
> BILD format:
> <http://plato.cgl.ucsf.edu/chimera/docs/UsersGuide/bild.html>
>
> I hope this helps,
> Elaine
> -----
> Elaine C. Meng, Ph.D.
> UCSF Chimera(X) team
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
>
> > On Jul 14, 2017, at 2:37 PM, Catherine Jenifer Rajam Rajendran <
> catrajen at umail.iu.edu> wrote:
> >
> > Hi,
> > I am trying to display an axis in chimera. I have one point - x,y,z
> co-ordinates and centroid's x,y,z co-ordinates. I want to extend the length
> of the axis generated using this two points. I tried to create a bild
> format file.
> >
> > .cylinder 0.584 0.048 0.810 20.912 5.823 19.703 1
> >
> > where, second 3 co-ordinates are centroid. It creates an axis but i want
> to extend the length from centroid point to the other end too. Or, Is there
> any other way to define it? Please help me.
> > Thanks,
> > Catherine
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://plato.cgl.ucsf.edu/pipermail/chimera-users/attachments/20170717/b923b2fb/attachment.html>
```