tkCassiopee : closing/fixing holes in a surface

This tutorial demonstrates how to obtain a closed surface from an open surface. Using a closed surface is usefull for a variety of algorithms.
You should already have read how to select zones and how to open applets.
[Dowload sample file].

      Closing/fixing a hole in a sphere by C. Benoit.

As a start, we consider an open sphere (Fig. 1) made of structured patches. We want to obtained a close, watertight surface from this sphere.

Step 1: get a single triangular zone
First, we will convert structured blocks to a single triangle zone. You can of course bypass this step if your surface is already triangular.
First open Block::tkBlock and Block::tkSplit. Then, select all blocks and convert them to triangles using Block::tkBlock::convert2Tetra. Once done, join all zones in a single zone using Block::tkSplit::join (Fig. 2).

Step 2: get the hole contours
Get the exterior edges of this surface using Block::tkBlock::ExteriorFaces (Fig. 3).

Step 3: fill the hole contours
Open Surf::tkFixer2. Select the exterior edges, and create the filling surface with Surf::tkFixer2::Fix gap in contour. You can bump more or less the filling surface using the slider.

Finally, delete the exterior edges zone and join all zone in one (Fig. 4).
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