The Crypt - Lighting Demo

This is a prototype for a 2D Global Illumination engine, made in Unity.  It shows a spooky ambient graveyard with an underground crypt, filled with different props and lighting effects to test out the engine.

Controls:

• Press numbers 1-9 to visit different scene setups
• Left Click on elements  to interact with them
• Left Click on the sky and drag to control brightness and time of day
• Right Click to cast light where the mouse is
• Tab to bring up the debug menu to tweak various options 

Running on a relatively powerful GPU recommended, press Tab and turn down the Ray Count if you are experiencing framerate issues.

Renderer Features:

• Every pixel can cast and receive lighting
• Works with regular Sprite Renderers and BiRP, very easy to integrate.
• Bounce-lighting, light that is cast onto surface pixels will re-emit, tinted by the surface color
• Transparent-emissive materials, which emit light but don't cast shadows.  Useful for particle effects like fire
• Partial-shadowing pixels which occlude only a percent of light.  Useful for creating depth in the scene 
• Lighting directionality is calculated per pixel, allowing normal maps to be used for increased fidelity
• Fully dynamic, no baking or setup required.  Scene configuration change incurs no extra cost

Implementation Details:
Global Illumination can be prohibitively expensive for 3D games, but for low-resolution 2D games, GPUs are powerful enough nowadays that you can cast hundreds of rays per-pixel and still get full framerate.  By default the demo casts 1000 rays per pixel, and the demo runs at a resolution of 320x240.  The rays are accelerated by a distance-field, which is re-built each frame with the Jump Flood method.