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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.
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