Hi Jeff, Here is another idea, still not exactly what you were asking for, but perhaps worth a look. You can use the Per-Model Clipping tool (under Tools... Depiction) to show a thin slab of the data, and you can interactively rotate and translate the slab any way you want relative to the data with the mouse. http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/per-model/ per-model.html Just choose which model to clip, enable clipping, turn on slab mode and adjust clipping with mouse. You may also want to adjust the contour level in Volume Viewer. I tried it on emd_1274.map in the production release (1.2540). You can use it on solid, surface, or mesh volume displays. Below I attach an image of a slab surface display together with an unclipped solid display (a second copy of the same data). There is also a command to control per-model clipping in a script, mclip. It lets you specify location/orientation in the data coordinate system or the viewing coordinate system. http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/mclip.html Best, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html