I'm totally confused about the use of extend. I understand right and left reverse but the hide and ignore are puzzling me. I have a cave which has three entrances with their passages all converging at a common point. I want to show an extended elevation from only one of the entrances and ignore or hide the other two passages. I've created a simple example of what I want to do. This is what I get without any modifier. Exactly what I expected.I want to hide the passage at the top (stations 1 to 2 and 2 to 5). centreline extend left 0 1 10 90 0 1 2 10 45 45 2 5 5 90 0 1 3 10 90 0 3 4 10 100 0 endcentreline test 1 The manual says extend <spec> [<station> [<station>]] ◃ control how the centerline is extended. ignore ◃ ignore specified station (shot), continue extended elevation with other station (shot) if possible hide ◃ do not show specified station (shot) in extended elevation Presuming that (shot) would refer to the two stations 1 to 2 I tried centreline extend left 0 1 10 90 0 extend [hide 1 2] 1 2 10 45 45 2 5 5 90 0 1 3 10 90 0 3 4 10 100 0 endcentreline but got the error therion: error -- test.th [5] -- unknown extend flag -- hide 1 2 I then read the manual again and tried … extend hide 1 [2] ... This time I got test 2 Not what I expected. The two lines at the top are shots 5 -2 and 1 - 2. I understand why 5-2 might still be there but not 1-2 and why is there no vertical element to 1-2? I tried again using ignore instead of hide and got the same as test 1. I then tried … extend hide 1 ... with this result test 3 Changing hide to ignore gives the following result. … extend ignore 1 … test 4 So, I have two questions. 1. How do I hide or ignore the side passage 2. What is the logic behind the results I get. Dave Clucas daveclucas.com mycaves.org. daveclucas@icloud.com
