Shap3d48.dat, 48th 'shape' file for CPO3D

Cone, segments concentrated at tip, by users equation.


For information on the option for users equations, see users equations.


The cone has an open-end radius r = 0.1 and a length s = 1.

The equations used here for x, y anz are:




where f goes from 0 to 1 and n = 4.

It can be seen that the segments are strongly concentrated at the tip, due to the exponent 4. Of course in practise the tip would be rounded, but this example shows how easy it is to concentrate the segments (which is required in the Boundary Element Method for an accurate simulation).

With the tip not rounded, the triangular segments at the tip inevitably have a large ratio of length to base width. Therefore it is unfortunately necessary to effectively disable the test for this ratio by going to

\databuilder\printing levels and chacks\allowed reading...\maximum...\

and using the value -1000 (which replaces the normal maximum of 20 by 1000).