Dear Damien, When you click "Make models" in Multiscale Models, it leaves the original input structure as atoms, but shows any additional copies as surfaces. That is the initial appearance, but you can display each chain in whatever style you want by using the dialog (select chain, act on selected chains). You could show them all as surfaces or all as atoms, for example. If you already have all the surfaces you want, you could just use "Actions... Atoms/Bonds... hide" or command "~display" to hide the atoms. In your case, I am guessing it would also work to use the Multiscale dialog to select chains "with loaded atoms" and then act on selected chains to "hide all styles." I believe only what is displayed will be exported. I tried 1yau from the PDB, which is slightly different from what you get from pdbsum. From your picture, it looks like the file from pdbsum includes one whole ellipsoid-shaped complex, and Multiscale Models created an additional copy of that complex. The file from the PDB includes one half-ellipsoid and Multiscale Models adds the other half. But either way, you can control the display as described above. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Apr 20, 2009, at 11:58 PM, Damien Larivière wrote:

Dear Chimera team, I have used the multiscale model for generating a surfacic model of (pdb) file 1YAU.mmol (from pdb sum).

Two models are displayed (see attached image): one is an all-atom model and the other is the surfacic model.

I would like to know :

- how to delete the all-atom model in order to export in the vrml format only the surfacic model (the two-model scene is fast for exporting but very long for opening in software like 3DSmax) ?

- why, sometimes, are displayed in the same view the surfacic model as well as the original structure ?

My best regards Damien