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Description
This utility can be used to help identify coincident surfaces in the FRED model, which will typically show up as material ambiguity errors in the raytrace output. The utility works by allowing the user to specify a box (either an entity's trimming volume box or a user-specified box in global coordinates) and then raytracing some specified number of rays through that volume. If a ray's propagation distance between two surfaces (along the ray's direction) is found to be less than a specified threshold value, those surfaces are flagged as potentially coincident.
The user can select an arbitrary number of rays with which to perform sampling of the volume. The following method is used in the calculation:
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1.
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N rays are generated with random positions/directions within the box volume.
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2.
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Rays are moved free-space along their current directions to the edge of the box.
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3.
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Rays are propagated forward into the box and are allowed to intersect surfaces.
a. Ray intersection propagation distances are checked to map the coincident surfaces.
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After the calculation has been performed, a report is generated and printed to the output window. The report includes the calculation time, calculation settings and a list of potentially coincident surfaces along with their ray counts. Ray counts for the coincident surfaces may be used as an indication of the likelihood of coincidence.
Navigation
This feature can be accessed by selecting Tools > Identify Coincident Surfaces from the menu.
Controls
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Control
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Inputs / Description
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Defaults
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Volume to Search
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Use Entity's Global Trimming Volume
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Any entity in the model can be selected using the entity picker interface and the region within its global trimming volume box will be sampled for coincident surfaces.
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Toggled
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Use Custom Global Trimming Volume
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Allows a user-specified box to be explicitly defined in global coordinates by X, Y, Z Min/Max values.
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Not Toggled
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Coincident Surface Separation Threshold
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Ray propagation distances during ray sampling which are less than this threshold value will be used to indicate potential surface coincidence.
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1e-011
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Number of Samples
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The number of starting rays within the sampled volume. A larger number of rays will better sample the volume when checking for coincident surfaces but will also take longer to complete.
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5000
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OK
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Accept settings, perform analysis, and close dialog.
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Cancel
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Discard settings and close dialog.
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Help
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Access this Help page.
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Related Topics
Tools Menu Summary
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Copyright © Photon Engineering, LLC
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