Start by Make one elipsoïd with PolarEllipsoid.
Since the 97 november beta Elipsoide make by default one polar elipsoïde, but that wasn't true before this beta, so with The PolarEllipsoid command I'm shure you'll get the shape we need for the knife.
We need to add some Knots, so just type in InsertKnotSrf, or from the Surface menu, click Edit Tools, then click Add Knot.
At the Choose an object prompt, select the ellipsoid. The cursor moves along the surface.
At the Choose where to add knots (Direction=Both Symmetrical=No) prompt, choose the knot location. Type in "D" and "U" for choose the direction. Add a few knot like the picture, this will give a good control later.
Select the surfaces, from the Surface menu, click Point Editing, then click Show Control Points or directly type in ShowCV.
Select the controls points just on the right from the center axe with a rectangle selection.
From the Transform menu, click Stretch. or type in Stretch.While you are stretching the points use snap on the grid. At the Origin point prompt, choose the center point of the ellipsoide.
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Do the same thing for the back of the knife (on the left).
You should get something like this picture on the left.
OK, it isn\'t a knife at all, maybe a space ship, so let\'s refine the blade.
Always stretch the points with snap and orthoangle, do this in the Front view.
Now for create a protection shape between blade and sleeve, move (This is the command to enter) all points of the blade toward the sleeve. The points to move are all just on the right of the ellipsoide center.
For all the process you just need one Top and Front viewports, but the Perspective view will be pleasant for see the evolution.
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