Input data for an end spherical triangle.


An end triangle on a spherical surface -that is, triangle that has one side on an end bounding circle of a sphere. This is of specialised interest and is intended only for the more professional user.

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 sphere). 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 same as for the spherical 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 spherical surface, taken from cpo3d.dat, are:


est -end spherical triangle

100. 0. 0. corners of triangle

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

0. 0. 100.

0. 0. 0. centre of end bounding circle

100. radius of sphere that triangle lies on

0. 0. 0. centre of sphere

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

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


(and note that this electrode has been 'cancelled' by the last line).


The data required are:


Same as for the spherical triangle str, except that an additional line containing the x, y and z coordinates of the centre of the bounding circle is required after the first 3 lines. The first 2 corners (the coordinates of which are entered on the first 2 lines) define the side that lies on the bounding circle.