I'm using a GridGraph on a basic Terrain object. I added a mountain mesh and I want to make it impassable. Unfortunately the mountain mesh has a bit of ground on it which I want to have be passable. If I allow the bounding cube to be used in GraphUpdateScene it will properly flag the corresponding nodes in GridGraph as impassable, but that includes the ground which I want passable. When I try defining points, even the same dimensions as the bounding box, I get many fewer impassable nodes. I've tried setting Min Bound Height to relatively high, but it's still really inaccurate.
Here I'm just trying to get the mountain, but it's missing about half of them.
Edit: I know the Y values aren't exactly at 0, but I get the same results when Y = 0 on all the points.