I have some closed rock borders that are opaque as expected when viewing
my PDF file in Adobe Acrobat and FoxIT but are semi-transparent in
Okular and Atril.
Any suggestions on how to make them really opaque (on all PDF viewers)?
Translucency (which you only get on rock borders when using
"smooth-shading off"), does not work in all PDF viewers. There is
nothing you can do about that, unless you are able to submit a code
patch to the PDF viewer application.
https://therion.speleo.sk/wiki/contrib:externalviewers
Sorry, I know that's not what you wanted to hear.
Tarquin
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