Hi Josh,

Since you want to hide all the rays hitting a certain object in the NSC 3D Layout, you can simply use a filter string with “H” for hitting the object and the exclamation point (!) negate/exclude those rays.  If the “ground plane” is object 2, then the Filter String for the NSC 3D Layout would be:

!H2

In general though, you cannot hide segments of a ray, you can only hide the entire ray itself (children rays upon splitting can be considered a new “ray” for most Filter Strings).  If you want to hide a segment of a ray (i.e., if a ray hits objects A-B-C-D and you want to hide segments between B-C), you will need to parse the ZRD via the API, remove the undesired segments, and then treat downstream segments as a new ray.  In the A-B-C-D example, you would terminate the ray after it hits A-B and then create a new ray with the XYZ/LMN values for the C-D segment.  This is non-trivial and I would suggest sticking to Filter Strings as much as possible.