Marker Emitters
Marker Emitters are blueprint scripts (or C++) that lets you emit your own markers anywhere in the map
As seen previously, Markers are emitted by the Dungeon Builder class around the layout of the dungeon (e.g. Wall, Ground, Fence etc) and you can insert actors at that location from the Theme graph. You can even create your own markers emitted off of those parent markers, but without Marker Emitters you are restricted to the starting markers the dungeon builder has initially emitted for you
Marker Emitters gives you a lot of flexibility and you can query the dungeon model and emit markers anywhere in the map
A Marker Emitter is invoked right after the Dungeon Builder emits all the markers for the dungeon (Ground, Wall etc)
Creating a Marker Emitter
Create a new Blueprint class derived from DungeonMarkerEmitter
Assign the created blueprint marker emitter to the Dungeon Actor
Start placing your logic in the blueprint by overriding the Emit Markers function
This method is invoked by the engine and lets you emit as many markers as you like into the scene with any transforms.
To emit a marker, create a Emit Marker node
You can emit as many markers as you like
Theme Preview
If you want to preview your marker emitter logic in the Theme Editor's 3D Preview viewport, you can set it up like this:
Navigate to the theme editor's 3D Viewport > Properties > Dungeon
This will open up the dungeon properties. Add your marker emitter there and the preview viewport will pick up the markers emitted by your Marker Emitter blueprint script and show it in the preview viewport
Examples
Example #1
This marker emitter queries the dungeon model and emits a marker at the center of all the rooms
(right-click and open in new tab to zoom in)
The above blueprint can be found here: DungeonArchitect > Content > Showcase > Legacy > Samples > DA_TutorialGame > Blueprints > MyCustomEmitter
Example #2
The Hell Forge demo has a good looking cave like system generated using Marker Emitters.
Since the rocks for the cave walls cannot be inserted in the Wall and Fence markers (as they are big and would block the passage), we need to find positions in the empty space that are further away from the walls and fences
This is done with a marker emitter blueprint DA_InfinityBlade_Fire/Dungeons/Rules/MarkerEmitter/BPM_AdjacentCellEmitter
The Hell Forge theme applies rocks to these markers (EmptySpaceN) and increases their scale as they move further away from the the ground
This gives a nice progressive elevation to the mountains giving the impression that the pathways are naturally formed
Example #3
Heres another example of a curved roof created over a room using marker emitters
