How to make pathfind avoid terrain

[NoobInAFishTank]

so i have a npc and sometimes it randomly starts swimming in the ocean ( sand under the ocean ), so how would i make it so the pathfinding avoids terrain, heres the part of the script that makes it move:

function pathToLocation(location)
	local path = game:GetService("PathfindingService"):CreatePath()
	path:ComputeAsync(myRoot.Position,location)
	local waypoints = path:GetWaypoints()
	pathCount = pathCount + 1

	if path.Status == Enum.PathStatus.Success then
		local currentPathCount = pathCount
		for i, waypoint in ipairs(waypoints) do
			if currentPathCount ~= pathCount then
				return
			end
			if waypoint.Action == Enum.PathWaypointAction.Jump then
				myHuman.Jump = true
			end
			myHuman:MoveTo(waypoint.Position)
			delay(0.5, function()
				if myHuman.WalkToPoint.Y > myRoot.Position.Y then
					myHuman.Jump = true
				end
			end)
			local moveSuccess = myHuman.MoveToFinished:Wait()
			if not moveSuccess then
				break
			end
			if fleeing == true then
				if i == #waypoints then
					wander()
				end
			end
		end
	else
		getUnstuck()
	end
end

[xendatro]

Use PathfindingModifiers. You can specify terrain that the NPC should avoid by linking certain materials to costs.

This Roblox Creator Guide gives an explanation on how to do this.

[NoobInAFishTank]

for cost number would i set it to math.huge if i dont want it to go there at all

[xendatro]

Yeah