[Therion] Showing a lower scrap down a pit in an overlying scrap

[Bruce]

Footleg
>One of these is where a passage contains a pit with a second
>scrap going off at the bottom of the pit...

>In that example the lower scrap in included in a separate map, and
>that map is then included in the upper map using the preview command:

map map5 -proj plan
   scrap1 at s1
   break
   scrap2 at s2
   preview above map22
endmap

>What is the purpose of using two maps here? I appear to be able to do
>this with a single map containing the two scraps.

Hi Footleg

In this example

   scrap1 at s1
   break
   scrap2 at s2

should produce scrap1 overlying scrap2 (and is in one map, map5). So yes,
one map, two scraps, one overlying the other.

   preview above map22

places the outline of map22 in map5.  I don't think preview allows
specification of scraps, so a second map is required. (If I were writing
that map definition I would put the preview above first, because in map
definitions generally, therion places the object at the top of the list on
the top 'layer' in the map.  However in the case of previews it seems that
therion overrides that convention).

Bruce