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For Bounding box, from geometry, a ray is immediately terminated if it reaches the surface of the bounding box of the geometry, defined as the smallest rectangle or rectangular prism with edges parallel to the axes of the global coordinate system that encloses all of the geometric entities. This bounding box is extended by 5% in each direction so that rays can still interact with boundaries that coincide with the perimeter of the bounding box. Therefore rays can propagate a short distance away from the geometry before disappearing.
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For Bounding box, user defined, a ray is immediately terminated if it reaches the surface of a box of user-specified dimensions. To define the box, enter maximum and minimum values of each spatial coordinate.
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For None, the rays that propagate outward from the geometry will continue to propagate until the study is complete. If the maximum path length for the Ray Tracing study step is too large, this may result in trajectories that are extremely long relative to the characteristic geometry size.
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For Intensity or Intensity and power, enter the Threshold intensity Ith (SI unit: W/m2). The default is 1 mW/m2. Rays will be removed from the model if their intensity decreases below the specified value.
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For Power or Intensity and power, enter the Threshold power Qth (SI unit: W). The default is 10-3 mW.
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The Ray Termination feature can terminate rays at the exact time at which their intensity or power reaches the specified threshold (to within numerical precision), if there exists a closed-form analytic expression for this time. Such a closed-form analytic solution exists if:
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