On Apr 30, 2012, at 9:54 AM, Elaine Meng wrote:
I'll try to clarify: Picking from the screen is one way to make a selection. Selection can also be done with menu or command. <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/selection.html>
So, you could either select two atoms (using picking or menu or command) and then click the Create button, as in method 1 above, or use method 2 picking with doubleclicking the second atom as you pick it instead of using the Create button
Patricia, I think the thing you're missing is that control-click will select an atom but in order to select a second atom without de-selecting the first you need to shift-control-click the second atom. --Eric Eric Pettersen UCSF Computer Graphics Lab http://www.cgl.ucsf.edu