[Therion] Visibility of underlying objects in PDF viewers

[Paul Rowe]

Thanks Bruce. Very useful advice.

On Fri, 21 Jun 2024 at 6:23 PM, Bruce Mutton <bruce at tomo.co.nz> wrote:

> Hi Paul
>
> This is a known issue with PDF viewers, not so much with Therion.
>
> Have a look at
> https://therion.speleo.sk/wiki/contrib:externalviewers#viewers_for_therion_outputs_not_part_of_therion_package,
> particularly the bit about ‘transparency knockout’ and the examples lower
> down the page.
>
>
>
> Just something to be aware you don’t have control over when you are
> drawing!
>
> Bruce
>
>
>
> *From:* Therion <therion-bounces at speleo.sk> *On Behalf Of *Paul Rowe
> *Sent:* Friday, 21 June 2024 15:33
> *To:* List for Therion users <therion at speleo.sk>
> *Subject:* [Therion] Visibility of underlying objects in PDF viewers
>
>
>
> Hi,
>
> I'm mostly using the Sumatra PDF viewer to open my Therion PDF outputs as
> it doesn't lock the PDF file when it's open and you can then keep updating
> the map without closing / opening the PDF output each time.
>
>
>
> However, I've noticed that Sumatra PDF doesn't seem to hide underlying
> objects in the final view, while some other PDF viewers like Acrobat do.
> Has anyone else noted this? I wasn't sure if it was a quirk in how the PDF
> is constructed by Therion or whether the issue is in Sumatra.
>
>
>
> Example passage with 'area' of debris using "-place bottom", with
> overlapping closed circles of larger hand-sketched boulders using "-place
> top".
>
>
>
> Sumatra view
>
> Acrobat view:
>
>
>
> I'm hoping this is something I can fix on the Therion side as end users of
> the PDF can end up with a map that's difficult to read if they're using
> some PDF viewers. The built-in PDF viewer in Firefox and Chrome has the
> same issue.
>
>
>
> Cheers,
>
> Paul
>
>
>
>
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