Culling seems broken for marine track
Issue #28
open
There seems to be a problem whereby tracks are remaining visible when they should be obscured by the terrain.
In the first attached screenshot we view some tracks from above.
In the second I've panned/zoomed . The landmass should obscure the tracks, but it doesn't.
I suspect this may be associated with our workarounds to make tracks visible through the textured-sea-surface.
Comments (10)
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reporter
Hi,will have a go on Monday.
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reporter
(Reply via i...@planetmayo.com):
Hi, will do tomorrow morning, Ian
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reporter
- attached Archive.zip
- attached Screen Shot 2012-02-23 at 14.03.18.png
- attached Screen Shot 2012-02-23 at 14.03.26.png
Hi, I've attached annotated screenshots.
The red highlight circles a track. In the ...18.png image you'll see it goes into an inlet on the coast. In the .26.png image you'll see that the track line should disappear behind the hill, but it remains visible.
I've also attached a zip containing the a set of tracks. Once unzipped, you should be able to drag/drop them into the app, and view the problem (or at least verify if it happens under MS Win.
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Yes, I see what you are saying now. It is almost certainly caused by the disabling of depth testing. The most ideal solution would be the new ocean surface being truly transparent so that tracks can be seen through them w/o any special changes. I think this problem should wait until the new ocean layer is implemented in case the problem is fixed there.
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reporter
ok. that sounds fine.
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- changed status to on hold
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reporter
- changed status to open
It's probably worth re-opening this, to ensure our Surface-Layer solution isn't causing this problem, and that we don't forget it.
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reporter
- attached Screen Shot 2012-06-15 at 15.05.07.png
- attached Screen Shot 2012-06-15 at 15.01.07.png
I've inserted another screenshot of this behaviour. In it, you can see the red lines get shorter and shorter. As I pan the screen, the length of the lines grows.
The second screenshot is with the surface switched on. This has no effect on the culling - so I think it's something else.
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reporter
Aah, I've been having a further play. I can see instances where the drop-lines are culled by the semi-transparent sea surface. So instead of seeing them through the surface, they're getting partially culled.
It would be great for us to learn more about this.
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I've tried to replicate this and can't seem to get it to happen. Whenever the tracks go 'behind' some terrain due to panning or tilting, they disappear for me. Because those screenshots you posted are so small, its hard to see the problem. Could you perhaps post larger ones?