Terrain textures disappear about pioneer HOT 12 OPEN

Ok, I might have a fix for this in the works but it's after midnight, so I'll continue another day

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That's not rendering the patch at all it seems, almost like the culling has decided it isn't visible

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I can reproduce, see the attached save file. Just load it in Pioneer and you should see it.

Jameson2.zip

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This isn't a GPU/driver bug, this is CPU side terrain generation and the rendering calls itself. Can confirm that it's CPU side only so you'll see it on anything that can run it.

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I can confirm that it's the Horizon Culling optimisation which is... over optimising for some reason 🤷 however nothing appears to have changed in the SSphere::HorizonCulling method in years. The only change I can see is to the centroid in GeoPatch but I don't know how that might be affecting it.

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I've not been able to repro' this with some quick local testing around Pallas or Thebe. I also tried with the supplied savegame.

@SomenameIchose what GPU do you have?

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I've not been able to repro' this with some quick local testing around Pallas or Thebe. I also tried with the supplied savegame.

@SomenameIchose what GPU do you have?
Intel(R) Pentium(R) Gold G5420 CPU @ 3.80GHz 3.79 GHz

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I gave an another try to fly to Pallas but textures don't disappear this time. Maybe it happens at certain coordinates?

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Yes, I tested it, they disappear at coordinates of S029°25'12 E042°42'07

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Note that it happens both on my integrated Intel card and my discrete Nvidia card (with Nouveau).

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Oof nope that ain't it either, you have found me a real doozy of a bug 🤣

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I've put in a first draft of a fix in #5829 which will need some serious testing.

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