Hi there!
1) The renderer will find your default camera and render to it automatically.
2) The demo scene has an example where the player controller is using a flashlight that is properly blocked by walls!
If you have any issues, just let me know.
Viewing post in NixFX Lighting System for GameMaker Studio comments
Thank you for the quick reply. I'm at work and tried to look through documention using my phone quick. I have another question. Can I create custom dark areas in a room that has buildings I can enter? Let's say I don't want the entire room to be dark, but only a 300x300 pixel area. Is that possible? Is it easy to shut the system off in rooms where my player is outside during day when light is not needed?
The current system works with light sources and occluder objects (to create shadows). You place lights and give them a radius and you place occluder objects where you want to block light. The shadow system renders the entire scene dark except for where there are lights or where light is blocked. You can control ambient darkness with a single global variable that makes the entire scene lighter or darker, and I've included a day/night cycle variable to help with this.
And yes, turning off the system is easy: you simply disable the light renderer and the room will be unlit.