How to connect faces between 2 edge loops?

I'm trying to fill empty space in my mesh, and I looked at the knife tool page on the Blender Wiki, and I'm not sure if there's a way to make it so that a new edge is made using the knife tool. I took a screenshot, and hopefully it'll explain better than I can of what I'm trying to do. Oh and I'm using Blender version 2.71, by the way.

• – cegaton Aug 13 '14 at 7:19

In your particular situation, it looks like the bridge tool is what you want. Select two or more edge loops with AltShiftRMB, and then connect them with W>Bridge Edge Loops:

Fill

To do exactly what it looks like you are trying to do in your screenshot (connecting two vertices with an edge), select the two vertices and press F to create edge/face.

If you have the bundled F2 addon enabled you can create a new face from the selected edge and the surrounding vertices by pressing F again. The side on which the new face is created is controlled by the cursor position.

Knife

The knife tool is for cutting edges into existing faces:

• Did you manually select those vertices in the last gif? If not would you mind telling me what key you held down before selecting multiple vertices at once? – Marie Aug 13 '14 at 7:33
• @Marie Click Alt+RMB to select edge loops. For more info: wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Meshes/… – cegaton Aug 13 '14 at 7:40
• @Marie Alt Shift RMB to select multiple loops (Shift maintains the existing selection) – gandalf3 Aug 13 '14 at 7:48
• This answer would be better if it noted bridge first (since this answers the question) – ideasman42 Aug 13 '14 at 9:27
• Do note that in the second gif the F2 addon is enabled. – David Aug 13 '14 at 15:29