Design Snap Flow Graph

A Dungeon Flow graph allows you to control the layout of your dungeons using Graph Grammars. You can generate interesting graphs with simple rules

Create a new Dungeon Flow Asset by right clicking on the Projects window. (This can also be done from the Create menu in the Projects window or Assets > Create from the editor's main menu)

Double click the asset to open the Dungeon Flow Editor. Doc this window in a large area

Add two new nodes Room and Corridor. You can change the name of the nodes from the inspector window

These names map to the names you specified on the Module registration in the DungeonSnap game object

Select the Start Rule and on the RHS, delete the default T node and drop in a few Room nodes like this:


Cycles are not supported by the SnapMap builder

Execute the rule and see how the final graph is generated. You do this by clicking the Run icon on the Execution graph panel

We'd like to insert Corridors between the rooms. Create another rule and give it a name (e.g. Insert Corridors)

On the LHS, we want to find a patterns where two rooms are connected to each other like this (Room -> Room) and have it replaced with (Room -> Corridor -> Room)

The Graph Grammar will find a pattern you specify on the LHS and replace it with the one you specify on the RHS

The Indices on the nodes (e.g. Room:0, Room:1) are important that helps in correct mapping. Since we properly specified 0 and 1 indices on the RHS, it knows the direction of the newly created links to the corridor. This will be covered in detail in the full documentation soon

You control how your rules are run from the Execution Graph. Drag drop your newly created Insert Corridor rule on to the execution graph and connect it after the Start Rule.

Select the newly placed node and from the details panel, change the execution mode to Iterate and set the count to 2 or 3 (This makes the rule run multiple times since the newly replaced Room nodes wont map with the adjacent older Room nodes by design and need to be run again)

Execute the grammar and you'll now see corridors between your rooms

We will use this Dungeon Flow graph grammar to generate our snap dungeons