Extensions:Py/Scripts/Manual/System/CrossSection

[edit] CrossSection

Name	Cross Section	Version	0.1.4 2008-09-22
This script creates cross-sections of selected objects at their intersection with active object. Active object must be a plane (or any one-face object). Only meshes will be cut.		License	GPL: GNU General Public License
Menu	Group: Object	Blender	2.46 and up
Author	Yorik, alxarch
Link(s)	http://yorik.orgfree.com/scripts/CrossSection.py

Executable: CrossSection.py	Modules:
Data:	External Dependencies: None

Additional information: Detailed documentation can be found on the script's home page.

the cutting plane and the resulting cross section

Cross Section

This Script creates a cross section of selected meshes:

Create a couple of meshes that you will want to cut
Create a plane, passing through them. It will be your cutting plane. It can be any object, but it must have only one face.
Select the meshes, then, with shift, select the plane. The meshes will still be selected, and the plane will be active.
Run the script
Voilà! the meshes are cut at their intersection with the plane, and a new object is created containing the section. (In this image, I moved the section away for clarity)

You must have been in Vertex or Edge mode when you apply the script. If you have been in Face mode, the script won't be able to fill the section.
You will get wrong results if some edges are coplanar with the cutting plane. Try moving the plane a little bit so no edge are directly on it.

Thanks go to: