>If you put a survey in a map it will show the centreline...
Andrews suggestion is the only way I have done it to date, due to the (generally helpful) behaviour of Therion whereby (for pdf exports) selecting nothing selects all, and selecting any map object suppresses all selected survey objects. But it would be nice to be able to forcibly suppress scrap output, maybe something like this in a layout would do it; layout LayoutSurveyOnly symbol-hide group all # hides all survey and scrap symbols except passage foreground and background colours I think symbol-show group centreline #shows centreline related symbols debug station-names #shows all station names scale 1 1000 endlayout LayoutSurveyOnly That layout in combination with no selections (which by default selects all surveys and all scraps/maps in a source file) might do the trick. It worked for me, although it is slow to compile large projects due to Therion having to process all the scraps. As written above the layout generates centrelines with all the offsets and previews defined in maps, but hides all other drawing symbols. You can see below the effect on one of my projects. The light grey shading is the effect of the default white passage foreground colour overlying the preview below shading. Thanks for seeding the idea Michael Bruce -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20150625/67fe4714/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image002.jpg Type: image/jpeg Size: 42806 bytes Desc: image002.jpg URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20150625/67fe4714/attachment.jpg>