| Both sides previous revision Previous revision Next revision | Previous revision Next revisionBoth sides next revision |
| extend [2019/12/02 09:29] – Line spacing tarquinwj | extend [2019/12/07 01:49] – if extend normal reverse is first statement brucemutton |
|---|
| * They must be followed either by a valid survey **<station>** id, or a valid survey **<leg>** (pair of stations).\\ | * They must be followed either by a valid survey **<station>** id, or a valid survey **<leg>** (pair of stations).\\ |
| * Generally specifying a **<leg>** applies the option to ONLY that leg, and specifying a **<station>** applies the option to all subsequent **<legs>** within the centreline. But there is an exception with hide, and perhaps ignore, so read the notes below carefully.\\ | * Generally specifying a **<leg>** applies the option to ONLY that leg, and specifying a **<station>** applies the option to all subsequent **<legs>** within the centreline. But there is an exception with hide, and perhaps ignore, so read the notes below carefully.\\ |
| * You can include multiple caves in the same extended elevation, or [[extend#how_to_export_correct_extended_elevation_from_zig-zag_centerline|straighten out zig-zag surveys]], by way of ''data nosurvey'' legs. | * You can include multiple caves in the same extended elevation, or [[tips#how_to_export_correct_extended_elevation_from_zig-zag_centerline|straighten out zig-zag surveys]], by way of ''data nosurvey'' legs. |
| |
| ''extend start <leg>'' - start generating extended elevation centreline with this leg. (In one case i have found, it can have unexpected effects, even far from the starting leg. I think i prefer 'extend start station' as below.)\\ | ''extend start <leg>'' - start generating extended elevation centreline with this leg. (In one case i have found, it can have unexpected effects, even far from the starting leg. I think i prefer 'extend start station' as below.)\\ |
| \\ | \\ |
| ''extend normal <leg>'' - extend this leg only, in the same direction as the leg immediately previous, then continue extending subsequent legs as per leg immediately previous [I’m not sure when this is particularly useful! I tend to be explicit, and use right or left in preference to normal and reverse.]\\ | ''extend normal <leg>'' - extend this leg only, in the same direction as the leg immediately previous, then continue extending subsequent legs as per leg immediately previous [I’m not sure when this is particularly useful! I tend to be explicit, and use right or left in preference to normal and reverse.]\\ |
| ''extend normal <station>'' - continue generating all extended centreline legs from this station onwards, in the same direction as the leg immediately previous.\\ | ''extend normal <station>'' - continue generating all extended centreline legs from this station onwards, in the same direction as the leg immediately previous. \\ If extent normal is the first statement after extend start, then it will extend to the right.\\ |
| ''extend reverse <leg>'' - extend this leg only, in the opposite direction to the leg immediately previous, then continue extending subsequent legs as per leg immediately previous.\\ | ''extend reverse <leg>'' - extend this leg only, in the opposite direction to the leg immediately previous, then continue extending subsequent legs as per leg immediately previous.\\ |
| ''extend reverse <station>'' - continue generating all extended centreline legs from this station onwards, in the opposite direction to the leg immediately previous.\\ | ''extend reverse <station>'' - continue generating all extended centreline legs from this station onwards, in the opposite direction to the leg immediately previous. \\ If extent reverse is the first statement after extend start, then it will extend to the left.\\ |
| \\ | \\ |
| ''extend vertical <leg>'' - do not extend this leg horizontally, extend only the vertical component of this leg, then continue extending subsequent legs as per leg immediately previous. The order of stations in your vertical statement should usually match the direction of extended elevation centreline generation. However if Therion seems to ignore this vertical statement, try reversing the order of the stations in your vertical statement, and it might work!\\ | ''extend vertical <leg>'' - do not extend this leg horizontally, extend only the vertical component of this leg, then continue extending subsequent legs as per leg immediately previous. The order of stations in your vertical statement should usually match the direction of extended elevation centreline generation. However if Therion seems to ignore this vertical statement, try reversing the order of the stations in your vertical statement, and it might work!\\ |
| * Often specifying one <leg> then in the next line specifying a <station> will stimulate the desired autogeneration. | * Often specifying one <leg> then in the next line specifying a <station> will stimulate the desired autogeneration. |
| |
| * Don't miss Martin Sluka's [[extend#how_to_export_correct_extended_elevation_from_zig-zag_centerline|hot tip for obtaining realistic extended centrelines]] from zig-zagged survey data (uses ''data nosurvey'') | * Don't miss Martin Sluka's [[tips#how_to_export_correct_extended_elevation_from_zig-zag_centerline|hot tip for obtaining realistic extended centrelines]] from zig-zagged survey data (uses ''data nosurvey'') |
| |
| * Caves, or parts of caves that comprise a linear passage with one or two dead-end branches are easiest to generate extended centrelines for. | * Caves, or parts of caves that comprise a linear passage with one or two dead-end branches are easiest to generate extended centrelines for. |