Modified version of KoS terrain height calculator

gistfile1.txt

			Vector3d worldRayCastStart = body.GetWorldSurfacePosition(latitude, longitude, body.Radius + 50000);
			// a point a bit below it, to aim down to the terrain:
			Vector3d worldRayCastStop = body.GetWorldSurfacePosition(latitude, longitude, body.Radius + 49900);
			RaycastHit hit;
			if (Physics.Raycast(worldRayCastStart, (worldRayCastStop - worldRayCastStart), out hit, float.MaxValue, 32768))
			{
				// Ensure hit is on the topside of planet, near the worldRayCastStart, not on the far side.
				if (Mathf.Abs(hit.distance) <= 50000)
				{
					// Okay a hit was found, use it instead of PQS alt:
					alt = ((body.Radius + 50000) - hit.distance);
				}
				else
					alt = 0;
			}
			return alt;