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godot-lportal

Portal rendering / Occlusion culling module for Godot 3.2

You can either use LPortal as a full occlusion culling system if you can create your level as rooms and portals, or use it in a simplified single room mode to speed up culling in any 3d level.

Note that this is a Work in progress. Feel free to try out the latest version (master) but recognise that the API may change as I move towards first release.

plane_lines

Video of initial testing:
https://www.youtube.com/watch?v=uVwLltiouBs
https://www.youtube.com/watch?v=xF_3Fe2HRdk
https://www.youtube.com/watch?v=NmlWkkhGoJA

Features

  • Support for dynamic objects (DOBs)
  • Dynamic lights
  • Optional auto-generation of room bound convex hulls
  • Internal lightmapping workflow (for baking lights in Godot)
  • External lightmapping workflow (for baking lights in Blender etc)
  • Single room mode (for non-portalled levels)

Demos / Tutorials

https://github.com/lawnjelly/lportal-demos

Feel free to leave suggestions / feature requests on the issue tracker, especially regarding ease of use.

Current status

As everything is now basically working, I am currently working on a small demo / test first person shooter game. This is helping me find bugs / add usability features as I go.

Note I'm also currently rewriting the Godot 2d GLES renderer in core, so that has to take priority until it is working.

Instructions

Roadmap

  • Auto conversion of named room spatials and portal mesh instances to LRoom and LPortal DONE

  • Auto creation of mirror portals DONE

  • Recursive determine visibility DONE

  • Prevent memory allocations (use pools for plane vectors) DONE

  • Add support for objects moving between rooms - cameras, players, physics etc - DONE

  • Handle special cases (multiple portals views into room etc) DONE

  • Optimize non-moving statics DONE

  • Optional convex hull bound for rooms DONE

  • Auto convex hull bound generation DONE

  • Add debug graphical view of portal planes DONE

  • Add debug graphical view of room bounds DONE

  • Dealing with shadows from objects outside of view DONE

  • Universal visibility query for camera and dynamic lights DONE

  • Support for global directional lights (like the sun) DONE

  • Internal baked lightmap workflow DONE

  • External baked lightmap workflow DONE

  • Switchable culling method DONE

  • Bug fixing / testing ONGOING

  • Demo game ONGOING

  • Shadow caster optimization

  • Closable portals

  • PVS (primary and secondary)

Installation

To easily try out I have provided a win64 build under the 'releases' tab in github. However note that for production use on multiple platforms you will have to compile from source.

Compiling from source

See: http://docs.godotengine.org/en/3.0/development/compiling/index.html

Once the engine is compiling okay on your system, to add the module:

  • Create a folder inside godot/modules called 'lportal'
  • Clone / download this repository as a zip file and place the files in the lportal folder
  • Compile the engine as normal, it should automatically pick up the lportal module
  • Note that to export to other platforms you will also have to compile export templates for those platforms

You will know the installation was successful when you see a new Node type 'LRoomManager' in the Godot IDE.