To solve a model with the uniform theory of diffraction (UTD), you must activate UTD
for each relevant flat face.
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Select the face (or faces) in the in the 3DÂ view or in the
details tree that you want to solve with UTD.
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In the details tree, from the right-click context menu, select Properties.
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On the Face properties dialog, click the
Solution tab.
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Under Solve with special solution method, from the
drop-down list, select Uniform theory of
diffraction (UTD).
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Click OK to save the face properties and to close
the dialog.