[Therion] How does Therion decide which passages to put above and below

[Benedikt Hallinger]

Is there any layout option we can activate, so therion ignores map ordering alltogether and always just uses average scrap height?

> Am 12.12.2019 um 23:46 schrieb Tarquin Wilton-Jones via Therion <therion at speleo.sk>:
> 
> Alastair,
> 
>> I need to know how therion decides which passages to put above and below
>> others.
> 
> I have not yet looked into your specific setup, but this is the general
> case:
> 
> If you are *not* using "map-endmap" to define a map, or if you are
> selecting multiple objects in a dataset with several "select" commands
> rather than using a map, then Therion uses the average height of the
> stations in the scraps to determine the heights of each scrap, and
> stacks them accordingly.
> 
> If a scrap contains stations with altitudes 1m, 5m, and 15m, the average
> height of the scrap will be 7m. The scrap will be placed above scraps
> with average heights lower than that, even if the other scrap has two
> stations at 6 metres, passing over the first scrap's 1m altitude
> station. (It checks the averages, not the specific locations where the
> scraps cross each other.)
> 
> If you are using maps, then by default, a map of scraps will be placed
> with the scraps at the same stacking height as each other (so the
> passage fills are rendered overlapping, and the features like walls are
> all rendered on top of all the scraps at once). You use "break" to
> separate the rendering layers.
> 
> map map1
> scrap1
> scrap2
> break
> scrap3
> scrap4
> endmap
> 
> scrap1 and scrap2 get rendered at the same time, at the same stacking
> level as each other. scrap3 and scrap4 get rendered at the same time, at
> the same stacking level as each other. scrap1 and scrap2 get stacked and
> layered *above* scrap3 and scrap4.
> 
> When you have a map of maps, a "break" is implied between the maps.
> 
> map outermap
> map1
> map2
> map3
> endmap
> 
> The scraps in map1 are stacked/layered above the scraps in map2, and
> those in map2 are stacked/layered above map3.
> 
> You seem to be using maps, so you will be seeing this automatic breaking
> between maps.
> 
> If the scraps within a map are layered in the wrong order, change your
> ordering of scraps within the map to put them in the right order, and
> put "break" where needed to separate them into layers.
> 
> If the scraps within a map-of-maps are layered in the wrong order,
> change your ordering of maps within the outer map to put the top layers
> first.
> 
> Complicated setups can arise in some cases; If you have scraps within a
> map (eg. "mapxyz") where some are supposed to pass above, and some
> below, a scrap within another map (eg. "mapothr"), then you need to
> split your "mapxyz" map into two maps, one with the "above" scraps, and
> one with the "below" scraps, and then you need to include those two maps
> separately in the parent map, with the interleaved "mapothr" map between
> them.
> 
> I guess some of this might be stuff you already know, but maybe it will
> explain what you are seeing at least.
> 
> Tarquin
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