A very useful account of the various options Bruce. Well worth adding to the wiki!
I will experiment with some of my caves were I have LRUD data but have not entered it into Therion to see if I can improve my models. Footleg On 20 July 2013 23:12, Bruce <bruce at tomo.co.nz> wrote: > ** > > Footleg**** > > I think the answer is âyesâ.**** > > Hopefully you can view the images embedded in the image rather than > attached, otherwise this wonât make much sense.**** > > ** ** > > In this example there is a single centreline (comprising both cave and > surface survey) and 4 scraps.**** > > A short section of cave at the left hand end does not have any scrap drawn. > **** > > Compiled with Therion 5.3.11**** > > ** ** > > One interesting point is that regardless of the âwallsâ setting, there is > never a tube generated there once we have scraps drawn anywhere in this > centreline. My deduction is that Loch uses only one type of tube > generation per centreline, because in almost all my larger projects that > transition between traditional survey and paperless survey, I have a > combination of each type of tube generation within the same **Loch**model. > **** > > This fits with the description in the Therion Book**** > > *âwalls <auto/on/off> turn on/off passage shape generation from LRUD > data for* > > *subsequent shots. If set auto, passage is generated only if there is no > scrap referencing* > > *given centreline.â* > > ** ** > > In these examples I have not used any âpoint passage-heightâ or âpoint > dimensionsâ in the scraps.**** > > ** ** > > **** > > Paperless survey (no LRUD), walls auto, off or on (or not specified), No > plan scraps. [**Loch** always guesses tube dimensions]**** > > -same if LRUD present and walls off**** > > ** ** > > **** > > Paperless survey (no LRUD), walls auto, off or on (or not specified), plan > scraps drawn [**Loch** uses scraps for tube width and guesses tube height] > **** > > ** ** > > ** ** > > Now, I added a few LRUD to the same centreline, including some with only UD > **** > > ** ** > > data dimensions station left right up down**** > > 1.4 - - 20 20**** > > 1.5 - - 20 20**** > > 1.6 2 2 20 20**** > > **** > > 3.13 10 10 20 20**** > > 3.14 10 10 20 20**** > > ** ** > > Tube generation, where it occurs extends one station beyond those > specified.**** > > ** ** > > **** > > Paperless survey (some LRUD), walls on or auto (or not specified), No plan > scraps. [**Loch** uses LRUD for tube dimensions and only for stations > where partial data is provided, it guesses the missing data ie if a > station has no data, no tube is generated]**** > > ** ** > > And now adding some scraps and things get interesting.**** > > ** ** > > **** > > Paperless survey (some LRUD), walls off (or not specified), Plan scraps > drawn. [**Loch** uses scraps, not LR, for tube plan dimensions, and UD > for height where specified, otherwise height is guessed. Where there are > no scraps, LRUD is *not* used.]**** > > That is perhaps contrary to what one might expect from the Therion Book > âwallsâ entry. It also produces perhaps the best model.**** > > **** > > Paperless survey (some LRUD), walls on or auto, Plan scraps drawn. [**Loch > ** uses scraps AND LR for tube plan dimensions, and UD for height where > specified, otherwise height is guessed. Where there is no LR, then it is > guessed. Where there are no scraps, LRUD *is* used.]**** > > ** ** > > If I change the LRUD definition like thisâ¦**** > > ** ** > > data dimensions station up down**** > > 1.4 20 20**** > > 1.5 20 20**** > > 1.6 20 20**** > > data dimensions station left right up down **** > > 3.13 10 10 20 20**** > > 3.14 10 10 20 20**** > > ** ** > > ..then the guessed width troubles continue.**** > > **** > > Paperless survey (some LRUD), walls on or auto, Plan scraps drawn. [same > as above]**** > > ** ** > > So my final conclusion, for paperless survey, no need to include walls > statements in each survey, or if you do, walls off is better than on or > auto. If you happen to provide some UD data, then your model will be > improved (more realistic).**** > > ** ** > > I surmise that with these same settings, scraps with point passage-height > or point dimensions will have a similar effect, but I have not tested this. > **** > > ** ** > > Bruce**** > > ** ** > > ** ** > > _______________________________________________ > Therion mailing list > Therion at speleo.sk > http://mailman.speleo.sk/mailman/listinfo/therion > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20130721/d39e23b0/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image002.jpg Type: image/jpeg Size: 19226 bytes Desc: not available URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20130721/d39e23b0/attachment.jpg> -------------- next part -------------- A non-text attachment was scrubbed... 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