Input data for an end conical or cylindrical triangle.


An end triangle on a conical or cylindrical surface -that is, triangle that has one side on an end bounding plane of a cone or cylinder. This allows a cone or cylinder to be cut in a plane that is not perpendicular to the axis. It of specialised interest and is intended only for the more professional user.


See also program for automatically generating the segments of a cut cone, or program for a cut cylinder.



If this triangle is further subdivided by the program then the selected side continues to lie on the bounding circle (and all the corners of all the triangles continue to lie on the surface of the cone or cylinder). Note that the bounding circle is usually not a geodesic (the shortest route between two points on the surface). The other two sides of the triangle will lie on geodesics after subdivision.


The specification is the same as for the conical triangle, except that the x, y and z coordinates of the centre of the bounding circle are required. The first 2 corners define the side that lies on the bounding circle.


All types of electrodes can be scaled and/or shifted and/or reflected and/or rotated.


Examples of all the different types of triangles are given in shap3d28.dat.



For users who are editing or constructing an 'input data file' without the use of the data-builder -that is, pre-processor:

But Manual editing is certainly not recommended -it is a relic from the time when the databuilder was not available All users are strongly encouraged to use the databuilder, which always gives the correct formats and which has many options for which the formats are not described or easily deduced.


Typical data for an end triangle on a conical surface, taken from cpo3d.dat, are:


ect -end conical triangle

100. 0. 0. corners

70.71 70.71 0. (1st 2 corners are on bounding plane)

0. 0. 100.

0. 0. 0. centre of end bounding plane

.78540 angle of cone

0. 0. 100. point of cone

0. 0. 0. another point on axis, in direction of opening

1 1 numbers of 2 applied voltages (can be same)

0 number of subdivisions (=2**n) (0 cancels)