Figure: RCS of a PEC sphere illuminated by an laterally incident plane wave.
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=== Customizing 3D Plots ===
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[[EM.Cube|EM.CUBE]]'s current distribution plots are interactive. When you move the mouse over a current plot, tiny dots appear on its surface. These dots correspond to the points on the sensor plane where the current data have been calculated. Upon mouse-over, you can highlight one of these points. A small tooltip appears on the plot that shows the current value at that point. In other words, you can read the plot values using mouse-over. The legend of a current plot also shows the minimum and maximum current values, the current unit (A/m on metallic traces, V/m on slot traces and A/m<sup>2</sup> on embedded objects) as well as the mean current and the standard deviation.
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[[File:po_phys25_tn.png]]
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Figure: Reading current values from a current distribution map by mouse-over.
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[[EM.Cube|EM.CUBE]] offers two different ways of visualizing electric and magnetic current distributions: as a confetti plot or a cone plot. The first type is a scalar intensity plot and shows the current amplitude and phase using colored triangular mesh cells. The second type is a vectorial plot showing cones (or arrows) directed along the visualized current component. In the case of the total electric current distribution, the cone plot shows the overall direction of the currents at any point on the surface of objects. To set the type of a current plot, open the current distribution plot's property dialog by right clicking its name in the Navigation Tree and selecting '''Properties...''' from the contextual menu. In the Plot Type section, choose one of the two radio buttons labeled '''Confetti''' or Cone. In the latter case, you can set the size of the vector cones using the box labeled '''Max Size'''. You can set the plot type at the time of defining the current distribution before running the PO simulation. You can also change the plot type afterwards and switch between the confetti and cone types back and forth.
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[[File:po_phys26_tn.png|400px]] [[File:po_phys27_tn.png|400px]]
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Figure: A vectorial (cone-type) current distribution plot of the PEC sphere: (Left) overlaid on mesh and (Right) with the sphere object frozen.
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Current distribution maps are displayed with some default settings and options. You can customize the individual maps (total, magnitude, phase, etc.). To do so, open the '''Output Plot Settings Dialog''' by right clicking on the specific plot entry in the Navigation Tree and selecting '''Properties...''' or by double clicking on the surface of the plot's legend box. Two '''scale''' options are available: '''Linear''' and '''dB'''. With the '''Linear''' (default) option selected, the current value is always normalized to the maximum total current in that plane, and the normalized scale is mapped between the minimum and maximum values. If the '''dB''' option is selected, the normalized current is converted to dB scale. The plot limits (bounds) can be set individually for every current distribution plot. In the '''Limits''' section of the plot's property dialog, you see four options: '''Default''', '''User Defined''', '''95% Conf.''' and '''95% Conf.'''. Select the user defined option and enter new values for the '''Lower''' and '''Upper''' limits. The last two options are used to remove the outlier data within the 95% and 99% confidence intervals, respectively. In other words, the lower and upper limits are set to ? ± 1.96? and ? ± 2.79? , respectively, assuming a normal distribution of the data. Three color maps are offered: '''Default''', '''Rainbow''' and '''Grayscale'''. You can hide the legend box by deselecting the box labeled '''Show Legend Box'''. You can also change the foreground and background colors of the legend box.
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[[File:po_phys28.png]]
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Figure: The output plot settings dialog.
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[[EM.Cube|EM.CUBE]]'s field plots are interactive. When you move the mouse over a field plot, tiny dots appear on its surface. These dots correspond to the points on the sensor plane where the field data have been calculated. Upon mouse-over, you can highlight one of these points. A small tooltip appears on the plot that shows the field value at that point. In other words, you can read the plot values using mouse-over. The legend of a field plot also shows the minimum and maximum field values, the field unit (V/m for electric and A/m for magnetic) as well as the mean field and the standard deviation.
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[[File:po_phys33_tn.png]]
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Figure: Reading field values form a 3-D sensor plot using mouse-over.
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[[EM.Cube|EM.CUBE]] offers two different ways of visualizing electric and magnetic fields: as a confetti plot or a cone plot. The first type is a scalar intensity plot and shows the field amplitude and phase using small colored pixels whose size is depends on the total size of the sensor plane and its number of samples. The second type is a vectorial plot showing cones (or arrows) directed along the visualized field component. In the case of the total electric and magnetic fields, the cone plots show the overall direction of the fields at any point on the sensor plane. To set the type of a field plot, open the field sensor's property dialog by right clicking its name in the Navigation Tree and selecting '''Properties...''' from the contextual menu. In the Plot Type section, choose one of the two radio buttons labeled '''Confetti''' or Cone. In the latter case, you can set the size of the vector cones using the box labeled '''Max Size'''. You can set the plot type at the time of defining the field sensor before running the PO simulation. You can also change the plot type afterwards and switch between the confetti and cone types back and forth.
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[[File:po_phys34_tn.png|400px]] [[File:po_phys35_tn.png|400px]]
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Figure: Vectorial visualization of the electric and magnetic fields: (Left) E-field, (Right) H-field.
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Similar to current distribution plots, field plots (total, magnitude, phase, etc.) are displayed with some default settings and options, which can be further customized individually. To do so, open the '''Output Plot Settings''' dialog by right clicking on a specific plot entry in the Navigation Tree and selecting '''Properties...''' or by double clicking on the surface of the plot's legend box. The settings are identical to those of current distribution plots. Two scale options, linear and dB, are available. You can also change the lower and upper limits of the individual field plots as well as their color map.
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