From: Shivanand Malaganvi (
Date: Wed Aug 30 2017 - 07:12:33 CDT

    I am trying to plot 3D NCI (non-covalent interactions) isosurfaces
(reduced density gradient plots) for a hydrogen bonded molecule using vmd
1.9.1. Unfortunately, the isosurfaces show only when 'draw' in the
'graphical representation' is set to either 'points' or 'shaded points',
but not for 'solid surface'/'wireframe'.
I followed these steps: 1) Molecular structure was optimized by Gaussian 09
at B3LYP/6-311++G(d,p) level.
2) Using the Multiwfn software, the cube files for 'reduced density
gradient' and 'electron density multiplied by the sign of the second
hessian eigenvalue' are calculated.
3) Using a script (RDGfill.vmd, see the attached file) the two cube files
were loaded to vmd program. I expected that the isosurfaces should be shown
by solid surface. But except molecular structure, nothing was shown.
However, when drawing style was changed to points/shaded points, it shows
surfaces. Any suggestions...?

I am using a computer which runs on Windows 7 (32-bit) operating system.

Thanks and Regards......
* Shivanand Malaganvi*
 Research Scholar,
 Vibrational Spectroscopy Research Group,
 Dept. of Physics, Karnatak University, Dharwad- 580 003,
 Karnataka, India.
 Cell No: +91-8197724647