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Holes in Shell can be selected the same way as Shell contours seen in other Shell videos.
When we move our cursor over a Hole, the cursor shape will give us an clue.
The mouse cursor over the upper hole contour does not find an edge, but moving it over
the lower hole contour does, as the Mercedes cursor shows. Also, the Info Tag says: Inner
Polygon of Shell.
We click the edge and the Hole extrusion body becomes selected.
All polygonal editing command are available for the Hole body: the Insert New Node, Curve
Edges and all the rest of polygonal editing commands are available.
Another possibility is to use the Edit Extrusion Length command of the Pet Palette.
By default the extrusion length of the Hole body is long enough so it cuts through the
whole of the Shell body. By reducing the Extrusion Length we can create a Hole body that does
not cut the Shell body.
As you can see now, the Hole extrusion body stops below the Shell body so no change occurs
to the Shell body. When the Hole body does not intersect with the Shell body, the Hole’s
wireframe is displayed with a different color.
Let us consider this Dome made of a Revolved Shell, and we create a circular hole in it…
the result in 3D shows that the Hole goes though the Shell body twice.
By modifying the Hole extrusion Length, we can achieve a state where on one side it only
partially cuts through the Shell body… or a state where it cuts the Shell body only
on the right side but not on the left side.
So using this command all kinds of cutting effects can be achieved.