How can I create seashells?

Tutorial by Gabriele Scibilia:

The following 10 steps show how obtain a scallop sea-shell (or something similar to it!):

• Add axis
• Add lines like this (use front view):

                                z
                    __    ...   |       ...    __
                .__|  |__|      +---x      |__|  |__.

              -130         .... 0 ....              130

• Invoke the extrude req:
  • to length 200
  • scale x 0.5
  • sections 10
• Add a primitive tube: radius 120
• Scale down the tube: 70% only y (shift-y)
• Adjust the tube position to cut the extruded shape like this:

                          _________
                         /         \
                        /\         /\        top view
                       /__\_______/__\

                        |           |
                      cutted      cutted

• Select extruded shape then tube and slice them
• Delete resulting objs except the 2 'planes' ('planes' should be part.2 and part.3):

                          _________
              part.2     /---------\

                           and this          top view
                          _________
                         /         \
              part.3    /           \
                        \_         _/
                          ---------

• Select first part.2 and then part.3, join them
• Invoke mold req and conform to sphere:
  • sphere radius 100
  • object radius 320

Last Update: July 13, 1995
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