MirrorModelling

	Create an sds-cube u:5 v:2 w:2. Switch to edit-mode (space-key). Drag-select the two right horizontal rows of points and destroy them.
	Select the sds-cube. Activate in properties - spec-tab - Interpolate Boundary
	Switch off edit-mode (space-key) for the sds-cube and create an instance of it. Select in the menu-bar edit and then instance.
	Select the instance and mirror it. For this you should turn on snap to grid.
	Now select the original sds-cube and start to edit it. You will see all modifications you make on the sds-cube on the left will be realtime mirrored done at the instance.
	If you think the shape looks ok delete the instance. Now you have to complete the object with dup/mir. Switch the object to edit-mode, select the right horizontal points, click on Dupl, click on mirror and mirror the duplicated points at the middle row (snap to grid turned on).
	Unfortunately the points in the middle will be duplicated. You have to select each point-pair and merge it. Can be a fiddle-work if you think for instance of working on a human character. After having merged all point-pairs the object should look quite ok.

I got an e-mail from Matthias Kappenberg (E-Mail) explaining the use of the tool Join Faces to put the two halfs easy together:

Hi Boris,

many thanks for the tutorial.

But I use the following technik for mirroring of complex objects (your step
6 and 7):

Select the object (in object-edit, not point- or face-)
Press the mirror-button
Hold "strg"-key when you set the mirror-axis (strg-key will create a copy)
capture001.jpg

Flip the face normals of the copy
(check the direction, very easy: Set the view properties to shaded and
single-sided and
the SDS-properties from smoothen to nurbs to polygonal. Look at the
different shading
of the faces, flip one face to see the effect)
capture002.jpg

Multi-select the the two objects in object-edit mode and merge them,

then use the "join faces" command with a very low input.
capture003.jpg

No points are doubled
capture004.jpg