"Empty" elevation tile detection...

[keince]

I'm in the process of implementing an out-of-scenegraph Line-Of-Sight algorithm that looks for occlusion with a given elevation layer and a Line-Of-Sight between two points.

Is there anything that tells me if a particular elevation tile is void of elevation data in its height field? This would be beneficial so as to avoid the need to walk the entire height field in the tile.

So far, I've found nothing in the code that would indicate an "empty" elevation tile.

Any feedback would be appreciated.