Hi Yazan,
Try increasing silhouetteDepthJump:

<http://rbvi.ucsf.edu/chimerax/docs/user/commands/set.html#silhouetteDepthJump>

Probably you tried the flat lighting preset which made it smaller than the initial default.
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 11, 2019, at 1:51 PM, Yazan Abbas <yazan.abbas@gmail.com> wrote:
>
> Hi Elaine,
>
> The thin silhouettes at the edges in my image are intentional, it is the thicker silhouettes where the model curves that are bothering me. They seem to intensify as the clipping changes, or when I rotate the model. In other figures I am preparing, the silhouettes are even more intense especially in cartoon helix tube mode and around the the curved parts of the tube (see image attached). They just appeared at one point in my session and I can't make them go away. They were definitely not there before even when silhouettes were turned on.
>
> Yazan
>