Part 2: Creating a Rocket (continued)
The next task is to make the back end of the ship look indented by
extruding, scaling, and pushing points.
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Open a new file by choosing File > New. Then import shipConical.wrl,
a file provided for this tutorial. Choose File > Import.
Clear the Selection field, then type in this pathname and
press Enter:
/usr/share/Insight/library/SGI_bookshelves/Help/books/CosmoWorlds_UG/Models/shipConical.wrl
You can save this new file as rocket.wrl (the file you've
been working on) or give it a new name.
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Select the shape and enter the PEP modeler by pressing Ctrl-e.
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Reposition your view so you can see the back side of the rocket shape. (Alt-drag
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Activate the PEP Jack by clicking its button on the PEP palette:

Drag it to the center point on the back end of the ship and click to
place it there.
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Drag a box around the points on the back end of the ship to select
them.

PEP Jack placed on center point and endpoints selected.
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Click the Extrude Polygons button
,
then drag the scaling cube on the PEP Jack to scale in the second ring
of points, inside the first.

Click Extrude Polygons, then drag PEP Jack handle inward to
create a second ring.
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Put away the PEP Jack by clicking on its button again.
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Now push the inner circle into the body. Make sure the inner circle of
points is still selected. (Use Ctrl-z to undo if you've
accidently deselected the points.) Click the Extrude Polygons button.
Place the cursor over the side of the cylinder, then Shift-drag
to the left (along the side of the cylinder) to push the selected
points in.

Press Extrude Polygons, then Shift-drag to push the selected
points in.
The final product for this section.
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That's it for the tail end of the rocket! Take a moment to save your
file before continuing with Shaping the Fin.
The next task is to extrude and push out segments to create the fin.
You've already learned about extruding. This section combines a split
function with the extrusion. If you're pressed for time, you can skip
this section and learn about coloring the rocket in the next section.
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Select a long quad on the ship's side, towards the back end.

Click to select a polygon.
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Click the Extrude Polygons button, place the cursor over the top of the
selected polygon, then Ctrl-drag to pull out a new segment.
Repeat to add a second section (press Extrude Polygons, Ctrl-drag).

Press Extrude Polygons, then Ctrl-drag up to create a new
section. Repeat.
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Now, select the face of the most recent extrusion that is facing
towards the back of the ship. Make a point on the back of the fin by
clicking on the Split Quads in an X Shape button found on
the Split palette:


Select polygon and split into X shape.
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Click on the background to deselect the quads, and click on just the
center point to select it. Place the cursor on the side of the quad,
and Shift-drag to the left to push out the point.

Select middle point of X, then Shift-drag to push point out.
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Looking at the ship sideways, sweep-select all the top points of the
fin to select them. Use Shift-sweep to select any missed
points. Then Shift-drag along a side and move the selected
points to the left.

Select polygons making up top of fin. Shift-drag along side to
elongate.
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That's it for the fin! Next, you'll color the rocket. Save your file
before continuing.
Continue 