Dear Yepin Sun, That is a very old tutorial (2005) — now radial coloring does not require another map. Instead you just use the by “radius” option in the Surface Color dialog, as described here: <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/surfcolor/surfcolo...> The Semliki Forest virus tutorial uses EMDB 1015, and in that case the “origin” to use in Surface Color dialog for coloring by radius is 0 0 0. In other data it might be in a different location. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On Sep 15, 2019, at 10:03 PM, sunyeping <sunyeping@aliyun.com> wrote:

Dear everyone, The Semliki Forest virus tutorial (https://www.cgl.ucsf.edu/chimera/data/tutorials/semliki/semliki.html) mentioned a radius.nc which is used for visualization of the layer. However, the tutorial doesn't describe where the reader can download it. Do you know where to get thid file? Thank you in advance. Yeping Sun