[chimerax-users] artificial lines or seems on surface using soft lighting

[Steve Chou]

Hi Elaine,
Thanks! Your suggestions (gentle lighting + commands) work well for me! Now
the lines are almost invisible.
All the best,
Steve


On Mon, Jul 6, 2020 at 12:28 PM Elaine Meng <meng at cgl.ucsf.edu> wrote:

> Hi Steve,
> If you're going to zoom in that much, simple lighting may be better than
> an ambient-occlusion mode (soft or gentle).
>
> However, if you are sure you want to use one of those, bear in mind that
> the ambient-occlusion modes use various approximations like a finite number
> of shadowing directions, depth map size, and a depth bias value.  Each of
> these parameters can be changed individually with the "lighting" command:
> <http://rbvi.ucsf.edu/chimerax/docs/user/commands/lighting.html>
>
> I see that the lines are more obvious with "gentle" lighting, but "soft"
> is prone to a sootier appearance especially viewed at such close range.
> Starting from "gentle" lighting, I was able to decrease the appearance of
> the lines by increasing the number of shadowing directions and the map
> depth, e.g. commands:
>
> lighting multishadow 256
> light msmap 512
>
> It's more difficult to avoid the sootiness of "soft" in this situation,
> without simply changing its parameters to be more like "gentle."
>
> 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 5, 2020, at 1:52 AM, Steve Chou <stevezchou at gmail.com> wrote:
> >
> > Hi ChimeraX folks,
> > When I used soft lighting, I saw lines/seams on the molecular surface
> (see the attached image).
> > To reproduce this:
> > ----------------------
> > load xxxx.pdb
> > surface
> > color violet
> > lighting soft
> > ----------------------
> > How to remove these artificial lines/seams? These lines also show up in
> the cutting plane in a section view.
> > Many thanks in advance!
> > Steve
>


-- 
Steve Chou
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