Terrain "hole" rendered when terrain tiles are missing

[NathanMOlson]

This issue appears in the terrain/fog render test. A hole appears in the rendered image.

Expected:

Actual:

Actual (drawn over a red background to demonstrate the transparent "hole" near the horizon):

[HarelM]

All terrain tiles have a border to prevent holes in the terrain, see:

• Terrain elevation tile stiching #1602

But for missing tiles I don't know what the behavior is.

Can you clarify the issue here, I'm not sure I understand the problem statement.

[NathanMOlson]

Sure. I've removed my thoughts about what is causing this so the problem statement is more clear, and added a separate issue for the problem with render test infrastructure: #4862

[ibesora]

What are your expectations on this? AFAIK, there's no hole it's just that it's getting rendered as if there were no elevation

[NathanMOlson]

My expectation is that there is never a hole in the map, even when terrain tiles neighbor missing terrain tiles. I expect the behavior to match the 3D terrain demo, which doesn't have holes at the edge of valid terrain.

[NathanMOlson]

@HarelM is more info still needed here?

[HarelM]

Is this a new issue that started from version 5 or does this exists from when the test when created?
Do we care that this test fail? Is it a valid scenario?
While I understand that there might be an issue, some information is still missing from my point of view.