4fef044660
Specifically, when rasterizing a triangle into a heightfield with width or height of 0. This can happen when the input geometry bounding box extents are less than half the cell size in either x or z. This is a degenerate case, but can crop up in real life scenarios (see https://github.com/godotengine/godot/issues/65764) so we should at least ensure it doesn't crash here.