UtahDigiCon 2014 - Bringing Life to your Games

PathFinding

RayCasting

Dave Geurtswww.davegeurts.com

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Bring Life Into Your Games

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PathFinding

RayCasting

Bring Life Into Your Games

PathFinding

PathFinding – A*Search Area

Break your level up into any type of Grid System

Your hero needsTo get from

Point A

To

Point B

PathFinding – A*

Each Square on our Grid is

Called a Node

Search AreaBreak your level up into any type of Grid System

Walkable

NOT Walkable

SLOW but Walkable

PathFinding – A*

Open List

and

Closed List

Shopping list of Nodes

PathFinding – A*

Calculating an F score for a Node

F = G + H

PathFinding – A*Calculating G for a Node

F = G + HGTotal Sum of F scores from the starting Point to Node

PathFinding – A*Calculating H for a Node

F = G + HHCount # of Nodes To get to the destination * 10

heuristic

PathFinding – A*

F = G + H

Open Listand

Closed List

Search Area - NodesBreak your level up into any type of Grid System

Walkable NOT Walkable

PathFinding – A*Recursive A* loop

Starting Node

Destination Node

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH Count Nodes To get to the destination * 10

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loop

Recursive A* loopPathFinding – A*

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loop

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loopG

PathFinding – A*Recursive A* loopH

PathFinding – A*Recursive A* loop

F = G + H

PathFinding – A*Recursive A* loop

PathFinding – A*

PathFinding

Demonstration

Questions?

PathFinding

Pop QUIZ!

PathFinding

RayCasting

RayCasting

RayCasting

Broad Phase Determine which things the ray might collide with.

Narrow Phase Test the ray against each possible thing to determineWhat it hits and where

RayCasting

Search AreaBreak our level up into Nodes

RayCasting

Shoot RayShoot out a ray from our point in an angle

RayCasting

Check every nth measurementCheck for collision along the angle every nth pixels

RayCasting

Broad Phase List of all Nodes that the ray touches, until the lengthOf the ray is reached.

RayCastingNarrow Phase

Test the ray against each possible thing to determineWhat it hits and where

RayCasting

Demonstration

Questions?

RayCasting

Pop QUIZ!

RayCasting

Results!