Hi Francesco, I guess you mean isopotential contour surfaces. I believe if you open signed data, then Volume Viewer would automatically show two contour surfaces, one for positive and one for negative. However, if it is only showing one contour surface, just Ctrl-click on the histogram in Volume Viewer to add another one (or as many more that you would like), as indicated by another vertical bar. You can drag the vertical bars on the histogram to change the levels, and change the color of the one most recently dragged or clicked. These vertical bars are called "thresholds" in the documentation. <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/framevolumeviewer.html> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volumeviewer.html#display> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco
On May 21, 2020, at 8:52 AM, Francesco Pietra <chiendarret@gmail.com> wrote:
I was able to open with chimera 1.1.3.1 (linux) electrostatic-potential cube files generated from ORCA package and view them in colors (red lowest, blue highest potential). I can't remember how I succeeded and now, from chimera help, I am no more able. Only a single color. Thanks for putting me on the right way. chiendarret