Chapter 5, Section 5.3 Running the CPO programs.

Part 2:

Here the following options are described:

2D, 3D, View, Voltages, Window, Palette and Help.

(For the options File, Run, Zoom, Nonzoom, Contour return to the first part of section 5.3)

2D: This option selects a two-dimensional view.

3D: Selects a three dimensional view. Initially the x axis is horizontal, the y axis is vertical and the +z axis points towards the user.

A dialog box permits rotation, shifting, scaling and perspective of the 3D view. For further information see the note on 3D displays.

In CPO2D the sub-menu items are:

Segments

Rays-in a variety of colours and used in cyclic order, with the repetition number being chosen by the user.

Test plane -the intersections of the rays with the first test plane are shown.

Create gaps between segments –useful for observing the distribution of the segments.

Time markers –for adding time markers to the rays.

In CPO3D they are:

ZY, XY, and ZX -where the first letter denotes the horizontal axis on the screen and the second the vertical axis

Segments

Rays-in a variety of colours and used in cyclic order, with the repetition number being chosen by the user.

Test plane-the intersections of the rays with the first test plane are shown

Axes -for adding the x, y and z axes to the plot (and the x, y and z axes are coloured 1, 2 and 3 respectively, -that is, red, green and blue)

Time markers –for adding time markers to the rays.

Solid -creates a solid object by filling in all the segments, starting with those at the back -this option requires a longer plotting time

Illuminated -a solid object is illuminated by angle. and the position of the light source is also chosen by the user (and note that a positive z for the light source places it in front of the screen). For further information see the note on 3D displays.

Cut-away -a solid object can be cut-away in various different ways.

It is possible to save a view at the end of the initial ray tracing.

Voltages: The voltages applied to electrodes can be altered using this option, after which the problem can be rerun using the Run command. The previously calculated segment and unit charge information is reused in this option, and so does not have to be read from the binary data file. This option applies to the choice Open for running only. With the choice Open for editing and running the voltages can only be changed by editing the voltages in the open input data file (and then the segment and charge information is re-read from the binary data files). The Voltages operation is not available in the demo versions.

Window has a sub-menu Arrange that can be used to tile windows and hence recover windows that have become hidden. All the windows can be moved and nearly all of them can be expanded, contracted or deleted. Those that cannot be expanded in a single operation usually have sides that can be moved to effect an expansion.

Palette: See the note on colours.

Help: Accesses the present comprehensive help system, which is well worth a full exploration!

The Help file is hlp.hlp, which must be in the same directory as the cpo execution files.

(return to the first part of section 5.3 or proceed to chapter 6)