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faq [2019/11/04 02:39] – minor reorder page brucemuttonfaq [2023/10/16 10:27] (current) – Visualising drawing errors and distortion - clarify debug dots and colours brucemutton
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 Xtherion "normal": {{therion:join_scraps_normal_xtherion.gif?120}} pdf "normal": {{therion:join_scraps_normal_pdf.gif?120}} Xtherion "tricky": {{therion:join_scraps_tricky_xtherion.gif?120}} pdf "tricky": {{therion:join_scraps_tricky_pdf.gif?120}} //Click on picture to see original size// Xtherion "normal": {{therion:join_scraps_normal_xtherion.gif?120}} pdf "normal": {{therion:join_scraps_normal_pdf.gif?120}} Xtherion "tricky": {{therion:join_scraps_tricky_xtherion.gif?120}} pdf "tricky": {{therion:join_scraps_tricky_pdf.gif?120}} //Click on picture to see original size//
 +
 +There is much simpler way - just by join command. Create in one scrap invisible line wall on open end with just tree not smooth points. Join the middle point of this line (l_line:1) to end or beginning of appropriate line of one of another scraps.  
  
 see also [[tips#joining_scraps_together]] see also [[tips#joining_scraps_together]]
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 ====How do export centerline only?==== ====How do export centerline only?====
  
-There are two types of maps definitions - one from scraps and other maps and second only from surveys. There is not possible to combine these two definitions in Therion.+There are two types of maps definitions - one from scraps and other maps and second only from surveys. You can also create a map of both maps and surveys, which will show both the scraps within the maps, and the centreline for the surveys (allowing you to show the surveys for parts where you have not yet drawn the scraps) - note that you now cannot hide the centreline.
  
     survey index_survey -title "Perlová jaskyňa"     survey index_survey -title "Perlová jaskyňa"
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   * **blue-lines** - scraps adjusted to survey stations (before processing joins)   * **blue-lines** - scraps adjusted to survey stations (before processing joins)
  
-  * **red points** - original positions of survey stations +  * **small red points** - original positions of survey stations 
-  * **yellow points** connected by yellow line - original position of two points in scrap with maximal distortion                                                                   +  * **large yellow points** connected by yellow line - original position of two points in scrap with maximal distortion                                                                   
-  * **black points** connected by black line - final position of two points in scrap with maximal distortion +  * **large black points** connected by black line - final position of two points in scrap with maximal distortion 
-  * **orange points** - the points with distance changed most during transformation                                                                              +  * **large red points** - the (station) points with distance changed most during transformation                                                                              
  
   * **yellow lines** connecting black and yellow points indicate how these points were shifted                                                                         * **yellow lines** connecting black and yellow points indicate how these points were shifted                                                                      
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    - The size of the maximum distortion (for a scrap) is proportional to the distance between the black point from it's corresponding yellow point (black and yellow joined by yellow).    - The size of the maximum distortion (for a scrap) is proportional to the distance between the black point from it's corresponding yellow point (black and yellow joined by yellow).
    - If the black points are obscured under the corresponding yellow points, then the maximum distortion is not very much at all.    - If the black points are obscured under the corresponding yellow points, then the maximum distortion is not very much at all.
-   - Spacing of matched pairs of yellow points, or black points is of little significance, perhaps it is an indication of the size of area in the scrap that has 'maximum distortion'.+   - Spacing of matched pairs of yellow points, or black points is of little significance. Perhaps it is, together with the large red point (if present), an indication of the size of area in the scrap that has 'maximum distortion'.
  
 We can create a special layout to hide distracting features, and emphasize the debug characteristics we are interested in. We can create a special layout to hide distracting features, and emphasize the debug characteristics we are interested in.
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 Each scrap defines a piece of cave passage, which (almost) always is defined by walls, being the boundary between a rock mass and the open space of the passage.  There will be open ends of scraps, with no walls, where the open space (passage) continues beyond the scrap. Each scrap defines a piece of cave passage, which (almost) always is defined by walls, being the boundary between a rock mass and the open space of the passage.  There will be open ends of scraps, with no walls, where the open space (passage) continues beyond the scrap.
  
-If these openings are very wide, then you may have to close the opening with a wall line with ''-visibility off'' or ''-subtype invisible''. +If these openings are very wide, then you may have to close the opening with a wall line with ''-visibility off'' or ''-subtype invisible''.\\ 
-If you want to draw a wall 'inside' a scrap, you must disable its passage defining properties, by setting ''-outline none''.+If you want to draw a wall 'inside' a scrap, you must disable its passage defining properties, by setting ''-outline none''.\\ 
 +If you have an oxbow, or large pillar, then you need to set ''-outline in''.\\
  
-If you follow these rules, Therion can correctly determine what is 'cave' and what is 'rock'.  Sometimes it is a bit tricky, especially if adjacent scraps are 'joined' and as drawn they overlap or have significant gaps (you should never do this intentionally).+If you follow these rules, Therion can correctly determine what is 'cave' and what is 'rock', at least for pdf outputs.  Sometimes it is a bit tricky, especially if adjacent scraps are 'joined' and as drawn they overlap or have significant gaps (you should never do this intentionally). 
 + 
 +And beyond this, if you want your kml __maps__ and 3d outputs to be generated correctly, you will also need to get the wall line orientations correct.  The yellow tick mark on the left of the line as you draw it must point towards the passage side of the line.  More on this on the [[drawingchecklist#wall|drawing checklist]] page.  You can adjust it with ''-reverse on|off''.
  
 If you get it wrong, you can get significant distortion and incorrect colouring in your 2d and 3d outputs.  If you get it wrong, you can get significant distortion and incorrect colouring in your 2d and 3d outputs. 
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   ## Martin Sluka Nov2019   ## Martin Sluka Nov2019
   ## Hides most objects and emphasises passage interiors and walls   ## Hides most objects and emphasises passage interiors and walls
 +  ## Does not check for correct line orientation (-reverse on|off). You need to export a map to kml to check line wall orientations
     symbol-hide group all     symbol-hide group all
     symbol-show line wall     symbol-show line wall
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   Warning: scrap outline intersects itself in bmb3_s3@fake.    Warning: scrap outline intersects itself in bmb3_s3@fake. 
 +
 +  Warning: invalid scrap outline in bmb3_s3@fake. 
  
 //I have this warning in a few scraps in that survey - I wondered how serious it was, and what I should do about it. But without more details of _where_ it intersects itself (and why this is a problem), I could not do anything but ignore it.// //I have this warning in a few scraps in that survey - I wondered how serious it was, and what I should do about it. But without more details of _where_ it intersects itself (and why this is a problem), I could not do anything but ignore it.//
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 This warning can sometimes happen if you have two wall lines joining on a single point, where Bézier curve controls pull the lines into a very acute angle (where the "back" facing Bézier controls are pulled beyond the arc of the other line). The solution is to reduce the angle of the join, or insert more linepoints so that the angle can be produced without needing to use Bézier controls to pull the lines so far that Metapost thinks they overlap. Check any such places in your scrap outline, and test whether removing the Bézier back or forward controls fixes it. If so, then this is the location of your error. This warning can sometimes happen if you have two wall lines joining on a single point, where Bézier curve controls pull the lines into a very acute angle (where the "back" facing Bézier controls are pulled beyond the arc of the other line). The solution is to reduce the angle of the join, or insert more linepoints so that the angle can be produced without needing to use Bézier controls to pull the lines so far that Metapost thinks they overlap. Check any such places in your scrap outline, and test whether removing the Bézier back or forward controls fixes it. If so, then this is the location of your error.
 +
 +It can also happen if a wall line has one of its Bézier controls pulled far enough to cross the opposite wall of the passage. Basically, even though the rendered walls might not actually touch because of the curves, you still need to be able to draw a line that connects all of the line points *and control points* in sequence, without crossing the far wall of the passage.
  
 It can also happen if you have inserted a point along a wall line, with its Bézier controls oriented backwards compared with the rest of the line, so that the backwards one points forwards, or vice versa. The rendering looks normal, but Metapost has had to flip the orientation of the line twice, so it complains. It can also happen if you have inserted a point along a wall line, with its Bézier controls oriented backwards compared with the rest of the line, so that the backwards one points forwards, or vice versa. The rendering looks normal, but Metapost has had to flip the orientation of the line twice, so it complains.
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 Options                 Options                
   * on   - sorts by length and shows the length with each persons name (same as 5.3.10)   * on   - sorts by length and shows the length with each persons name (same as 5.3.10)
 +  * hide - sorts by length but does not show the lengths (new syntax in 5.3.11-was 'off' in 5.3.10).  If some people have equal lengths, then they sort alphabetically
   * off  - sorts alphabetically (behaviour changed from 5.3.10 to implement new feature)   * off  - sorts alphabetically (behaviour changed from 5.3.10 to implement new feature)
-  * hide - sorts by length but does not show the lengths (new syntax in 5.3.11-was 'off' in 5.3.10).  If some people have equal lengths, then they sort alphabetically 
- 
 ====How do I add peoples names if they have more than two words / names?==== ====How do I add peoples names if they have more than two words / names?====
 The Therion Book says... The Therion Book says...
  • faq.1572831560.txt.gz
  • Last modified: 5 years ago
  • by brucemutton