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Are you standing on a raised platform when you see the Half Dome?

This is what I get when I set the observer height to 20m, and increase the "max distance" to 300km (200km = ~124 miles so may not be enough).

https://img.incoherency.co.uk/6478

It's also possible that the half dome is too short and the sampling rate of the line-of-sight jumps over it!

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It seems that sometimes it fails to load the height map, try reloading the page. You should see terrain shading if it's loaded properly.
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I think the lines indicate areas that you can't see?
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It's buggy. Mission peak shows much of the bay area occluded.
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