Pavel I was just experimenting. Yes, my advice was bad. I also have a project of many kilometres and 50 years, and was for a while creating special submaps for the purposes of exporting maps by chronological periods. As exploration and mapping progressed, it became too labour intensive to maintain separate series of maps for both chronology and spatial representations. Maps allow complete renderings of all drawn symbols, but are labour intensive. If lookups could be used it should be trivial to achieve the simple mp-fg blocked out type exports regardless of map structures. Your examples achieved this, just with the shadow of any overlying passages. If Therion could have a special colour definition 'transparent' for map-fg, then the lookup band for dates you don't want to render could be set to transparent. This way they would not leave a shadow on passages that are rendered. There is a hint that this may be conceptually possible in the Therion Book, page 58. • colo[u]r <item> <colour> . customize colour for special map items (map-fg, map bg, ... For map-bg, you can use transparent to omit page background completely. So a feature request: Is it possible to add a special colour for use with map-fg along the lines of that for map-bg ie transparent? This would allow flexibility beyond what the current transparency on/off and opacity statements are capable of. ie completely opaque map-fg rendering at the same time as some scrap foregrounds beng completely transparent (invisible). (There may be some oddities of rendering wrt the differences between pdf viewers) Bruce -----Original Message----- From: Therion <therion-bounces@speleo.sk> On Behalf Of Pavel Herich Sent: Wednesday, 7 August 2024 19:59 To: List for Therion users <therion@speleo.sk> Subject: Re: [Therion] Lookup explo-date - avoiding overlying scraps Thank You all, I did try this Bruce, with opacity 0 there is just blank page left. I agree, this could be done by customising map structure, but there is need for this for 88 km long cave system gradually discovered during 120 years. I´d like to make a video of discovery progress by each year in Demänovské Caves, so it should contain ~100 variations of the overall map... Pavel Dňa 2024-08-06 21:44 Bruce Mutton napísal(a):
Just a guess. Try...
transparency on
opacity 0
This may make the white passage invisible, but may also make
underlying passages appear to be on top.
I used to emulate what Pavel is trying to do using purpose-built map
definitions, but that is labour intensive.
Interested to see if lookups can be made to do this.
Bruce