Hi Roberto, It isn't a built-in function currently, but you can open the attached BILD file in Chimera (just use File... Open) to show the axes: X red, Y yellow, Z blue. The BILD format is very simple. In fact, the file just contains the following plain text: .translate 0.0 0.0 0.0 .scale 5 .sphere 0 0 0 0.5 .color 1 0 0 .arrow 0 0 0 5 0 0 .color 1 1 0 .arrow 0 0 0 0 5 0 .color 0 0 1 .arrow 0 0 0 0 0 5 You can edit the file if you want to change the offset (the .translate line) or the size (the .scale line). BILD format is described here: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/bild.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Apr 22, 2011, at 6:34 AM, Roberto Kopke Salinas wrote:
Dear All, Is there a way to draw and visualize the three axes of the PDB reference frame in Chimera? Thank you for your help, Roberto