From: Axel Kohlmeyer (
Date: Tue Jan 08 2008 - 11:37:29 CST

On Tue, 8 Jan 2008, Yinglong Miao wrote:

YM> Dear VMD users,
YM> I have a DX file of volume data for isosurface visualization. The volume is
YM> a cube centered at the origin. How can I choose half or 1/4 of the volume
YM> data for visualization? For atomic structures, atom selections like "Z > 0"
YM> and "X > 0 and Z > 0" can be used for this. But I can not apply similar
YM> selections for the volume data. Does anyone know the options to do it?

selections are intrinsically a per-atom thing and gridded data
as DX files are not. so it is not possible this way. however,
if you simply want to cut away segments like above, you can
use clipping planes to achieve the desired result.


YM> Thanks!
YM> --
YM> Yinglong Miao
YM> Ph.D. Candidate
YM> Center for Cell and Virus Theory
YM> Chemistry Department, Indiana University
YM> 800 E Kirkwood Ave Room C203A, Bloomington, IN 47405
YM> 1-812-856-0981(office)

Axel Kohlmeyer
   Center for Molecular Modeling   --   University of Pennsylvania
Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
tel: 1-215-898-1582,  fax: 1-215-573-6233,  office-tel: 1-215-898-5425
If you make something idiot-proof, the universe creates a better idiot.