Ray Evaluation
Use a Ray Evaluation () derived values node to evaluate a quantity computed by the Geometrical Optics or Ray Acoustics interface. This feature requires the Ray Optics Module or the Acoustics Module. This feature requires the Particle Tracing Module. To add this node, right-click the Derived Values node and choose Ray Evaluation from the More Derived Values menu
Data
Select a Data set. Only a Ray (Data Set) is available for selection. If no Ray data set is available, then the only option is None.
The Select via option is used to select the times at which the ray evaluation occurs. When Stored output times is selected, the Time list is populated with the output times from the solver, which is linked to the ray data set. When Interpolation times is selected, then enter an array of times for which the ray evaluation should be performed.
Evaluation
To specify the rays to evaluate the expression for, the Rays to evaluate list contains the following options:
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Select All (the default) to evaluate the expression for all rays in the simulation.
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Select Fraction to evaluate for a fraction of all rays. Enter a scalar value between 0 and 1 in the Fraction of rays field. The default value is 1, which means that the evaluation includes all rays.
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Select Number to specify a number of rays to evaluate for in the Number of rays field. The default value is 100 rays. If the ray simulation contains fewer rays than the specified number, all rays are included.
The Results Table
Click the Evaluate button () or right-click the Derived Values node and select Evaluate All () or Clear and Evaluate All ().
The first column in the table is a list of the Time values selected from the Data section. There are N additional columns, where N is the number of rays chosen in the Evaluation section.
The values in each column correspond to the supplied Expression for all the selected Time values. Each column contains M rows, where M is the number of Time values selected in the Data section. By default four digits are displayed; click the Full precision button () to display as many significant digits as possible. If required, the precision level can be changed from the The Preferences Dialog Box under General.