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Figure 2.1-3: Layer Extending Beyond Geodesic Turnaround Radius
2.2 Elliptical, Spherical Domes
Creation of elliptically and spherically-shaped domes is available by specifying the vessel radius at the
tangent line, and in the case of the elliptical dome, the radius of the ellipse in the y-direction (minor axis).
Figure 2.2: Elliptical and Spherical Domes
2.3 User-Defined Dome
Generally-shaped domes may be defined by providing a list of x-y coordinate pairs outlining the shape of the
dome. A portion of the dialog is shown in Figure 2.3. Right clicking on the mouse while the cursor is
positioned in the table will bring up a list of options which includes the filling of the table by reading from a
file. The text file must contain two columns of numbers separated by either a comma or a blank space. The
coordinate pairs may be listed in either ascending or descending order based on radius or position along the
tank axis. The plug-in will automatically convert the order of the coordinate pairs in order to create a top (or
concave) dome. When the domes are chosen as the top or bottom of the tank, then the plug-in will flip the
dome geometry if necessary.
The option of connecting the discrete points by straight lines or by cubic splines is provided. Generally using
splines will result in smoother shaped geometries.
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