[Therion] Rock border not creating boulders with smooth altitude shading

[Martin Sluka]

> 14. 11. 2021 v 22:04, Tarquin Wilton-Jones via Therion <therion at speleo.sk>:
> 
> I do not care much for Adobe Reader and its inability to draw layered
> opacity (which has caused issues for other applications that create PDFs
> such as PrinceXML). It's an awful PDF reader.

But only PDF viewer which is able to interprete transparency knockout correctly

> Foxit, Sumatra, Evince; these look great to me, and the others the who
> were discussing the output with me today.

These viewers just ignore transparency knockout 

Martin S.
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