Faceted UTD
With this option the UTD parameters for faceted UTD for planar and curved faces are specified.

Figure 1. The UT - Specify the UTD/RL-GO parameters dialog, set to Faceted UTD.
Parameters:
- Use faceted UTD on all surfaces with label
- The label to which the faceted UTD should be applied
- (optionally) up to label
- The label up to which the faceted UTD should be applied. Faceted UTD will not be applied to labels outside of the range between this field and the label in the previous field.
- Max no. of ray interactions
- This parameter gives the maximal number of ray-interactions. If for example, the parameter is set to 3, a ray can have 3 reflections. If set to 0, only direct rays are taken into account.
- Export ray file for post-processing
- When this item is checked the ray information is exported to the .bof and .ray files. Activate this option if ray paths are to be displayed in POSTFEKO where the ray information is read from the .bof file. The exported ray information may result in a large .ray file and a dramatic increase in the .bof file size. For parallel runs the run-time can also increase significantly when exporting ray data.
- Ray contributions
- Determines which ray contributions to take into account.
The following restrictions apply for the faceted UTD:
- Only PEC structures are allowed (no dielectric bodies, thin dielectric sheets or coatings are allowed).
- Only planar triangles are allowed.
- The faceted UTD may not be used in conjunction with other solution methods.