gm_navigation makes navigation tasks a breeze.
This all in one navigation module lets you easily create a node table that you can use for finding paths using a A* path finding algorithm.
All the other navigation modules currently available were too laggy for my needs. I have profiled this code and found it far more superior than the lua versions.
nav.CreateNav((number)gridsize) – Returns a new Nav with a set grid size
Nav:GetNodeByID(number) – Returns the node with the given ID
Nav:GetNodes() – Returns a table with all the nodes
Nav:GetNodeTotal() – Returns the number of total nodes
Nav:StartGeneration() – Start generating nodes, used to setup variables
Nav:AddGroundSeed(Pos, Normal) – Adds a walkable seed. During navigation the node will start spreading out from the first walkable seed. Once that seed is used up it will go on to the second, third and so on. The module will account for seed overlapping.
Nav:AddAirSeed(Pos) – Adds a seed for air nav generation (Similar to AirGroundSeed, but it will make air nodes).
Nav:ClearGroundSeeds() – Simply removes all ground seeds
Nav:ClearAirSeeds() – Simply removes all ground seeds
Nav:SetupMaxDistance(position, (number)distance) – Confines all the generated nodes to a set vector within the specified distance
Nav:Generate(function(Nav) print(“Finished Generating”) end [[, function(Nav, GeneratedNodeCount) print(“Generating”, Nav, “Nodes Generated:”, GeneratedNodeCount) end]] ) – Generates the node graph (threaded), will call the first callback function once it finishes. The optional second argument will be called while the nav is being generated every second. This function returns true if it was successfully added to the thread queue.
Nav:FullGeneration() – Generates the node graph (Non threaded), returns the amount of seconds it took to generate.
Nav:IsGenerated() – Returns a bool based on if its generated or not
Nav:FindPath(function(Nav, FoundPath, Path) end) – Finds a path from the start to the end node (Specified from Nav:SetStart / End). The callback function is passed the nav it was called on, boolean FoundPath (true a path was found), and a path table that contains a series of nodes the path took from start to end. The optional second argument will be called while the nav is being generated every second. This function returns true if it was successfully added to the thread queue.
Nav:FindPathHull(mins, maxs, function(Nav, FoundPath, Path) end) – Similar to FindPath but this will trace the specified hull along the path to ensure there is room for something with the hull size to move along it. It’s useful if you are moving an entity along a path that might have entities / the level blocking it. Mins, and maxs are vectors for the hull size. This function returns true if it was successfully added to the thread queue.
Nav:GetHeuristic() – Returns an heuristic enumeration
Nav:GetStart() – Returns the starting node
Nav:GetEnd() – Returns the ending node
Nav:SetHeuristic(HEURISTIC_BLAH) – Put one of those fun heuristic enum’s here
Nav:SetStart(Node) – Set the start node for FindPath
Nav:SetEnd(Node) – Set the endnode for FindPath
Nav:GetNode(position) – Returns the node at the position (Can be off by GridSize * 0.45)
Nav:GetClosestNode(position) – Returns the closest node to said position
Nav:GetNodesInSphere(pos, radius) – Returns a table of nodes found within the radius of the pos
Nav:GetDiagonal() – Returns a boolean for diagonal linking
Nav:SetDiagonal(bool) – Used to enable / disable diagonal linking
Nav:GetGridSize() – Returns grid size (number)
Nav:SetGridSize(number) – Set the grid size (Space between the nodes)
Nav:GetMask() – Returns the trace mask used during the node generation
Nav:SetMask(MASK_*) – Set the trace mask
Nav:CreateNode(Pos, Normal) – Returns a new node at position Pos and normal Normal
Nav:RemoveNode(node) – Removes node from existence
Nav:Save(filename) – Saves the Nav to a file
Nav:Load(filename) – Load the Nav from a file
Node:GetID() – Returns the id of the node in the GetNodes table. Useful for comparing nodes
Node:GetPosition() – Returns vector of the nodes position
Node:GetPos() – Alias of Node:GetPosition()
Node:GetNormal() – Returns vector of the nodes normal
Node:GetConnections() – Returns node table of the nodes connections
Node:IsConnected(OtherNode) – Returns a bool if Node is connected to OtherNode
Node:SetPosition(Pos) – Change the nodes position
Node:SetNormal(Normal) – Change the nodes normal
Node:ConnectTo(Node2, Dir) – Link Node to Node2 in direction Dir
Node:RemoveConnection(Dir) – Removes connection in the direction Dir
Example file should be used clientside so you can see what your doing.
Put it in your autorun directory and type “snav_generate_ground” to generate some ground nodes.
snav_generate_air to generate air nodes
snav_generate_ground_air to generate ground and air nodes.
Hold alt to view the nodes.
Go near a node and type “snav_setstart”
Go near another node and type “snav_setend”
Hold shift to view the path.
The example file will make a fun picture like this
gm_construct with 64 grid size, generated in 15 seconds with diagonal linking enabled. Node Total: 8092, Link Total: 58746 (Sorry for horrible quality)
Demonstration of Nav:FindPathHull with a hull about the size of a player.
Ground and air nodes: