light_trace_polygon doesn't produce a closed polygon, only an issue with shadows smaller than the shadow caster.
Z axis and shadow caster height: use eLight.Z and remove eLight.ShadowLength and obj_shadow_caster.shadow_length hack. Shadow map layers: assign lights and shadow casters to different layers, producing per-layer shadow maps. Optimizations: trade-off with usability / learnability. It also tracks various statistics (if you opt in) that help you optimize your use of the system. You can easily upgrade the lighting system, once integrated in your game, to a newer version by simply replacing the previous version's assets in your project. It might also work well for your game or prototype out-of-the-box by tweaking some of the knobs. To get the best performance, or lighting quality, or whatever else, for your game you will probably end up modifying it to some extent. It is my desire to provide a general lighting system that could be further customized to suit the needs of each specific game project it is used in. It has good support for object variables. Instances that inherit from the object obj_shadow_caster are able to cast shadows, and lights are placed and configured in the game with instances of obj_light. The surface is fitted to a "camera" that is used to perform the lighting pass. This is a lightweight shader lighting system for dynamic pixel lights that composites multiple lights into a single surface. I welcome additions and bug fixes to the general design of the lighting system back into the repository so all users benefit from your cleverness - full credit is of course given. I am releasing this system for free under the MIT License, and it is open-source so everyone can make it betterĪnd modify it to their heart's content. It's not, but this is what I wrote and it's free and looks alright. That's not to say that this is by any means a "gold standard". One of my priorities were to demystify a system like this and ensure that everyone can pick it up, learn from it and understand what's going on, and integrate and adapt it to their game projects. 
I decided to write a lighting system for GameMaker Studio 2 because I wasn't super satisfied with the availability of lighting in the GameMaker ecosystem. This system benefits massively from YYC, so it is recommended to use this compiler for releases. This is the minimum version of GameMaker Studio 2 you must use. This project is known to work in GameMaker Studio Beta IDE v2.2.1.374 with Beta Runtime v2.2.1.286 as of January 15, 2019.
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