From: Josh Vermaas (
Date: Mon Apr 27 2020 - 15:25:36 CDT

Surf depends on an external binary to work properly if I remember
correctly, and that binary may be caught up in the Catalina weirdness and
not run correctly, thereby generating no output. What happens if you switch
to QuickSurf? That one is implemented directly in VMD, so I'd expect it to
work more robustly.


On Mon, Apr 27, 2020 at 12:25 PM Neda Rafieiolhosseini <> wrote:

> Dear All,
> I have installed and used the latest version of VMD (VMD 1.9.4a42 Rev 3
> for MacOS X Catalina
> <> (Apr
> 24, 2020)) on my system.
> I try to open a ".pqr" file of a protein and load a .dx file on top of it
> to represent the surface charges on the protein. Everything is fine until I
> set the drawing method to "Surf" and the coloring method to "Volume" in
> the graphical representation panel. The problem is that when I set these
> two options, the protein in the OpenGL display disappears giving this error:
> ERROR) Cannot read SURF output file: /tmp/
> Info) Done.
> I will be thankful if anyone can help with this.
> Thanks.
> Neda