How to perform clip plane without shadows in surfaces in VMD?

Brief description of tools/files:
VMD is a molecular visualization program for displaying, animating, and analyzing large biomolecular systems using 3-D graphics and built-in scripting.

Link: VMD - Visual Molecular Dynamics

Contact person (name and email address): N/A vmd@ks.uiuc.edu

How the work has been tested/reviewed:

I am using VMD to view gromacs generated structures from GRO and TRR files.

I am trying to show the cross section of an STM virus using clip plane however I am getting shadows to those surfaces that was cut:

I am trying to get this instead:


How to perform clip plane without shadows in surfaces in VMD?

anyone?

This is not a GROMACS issue. Please ask VMD-related questions on their mailing list.