Unity Forward+ System

Overview

Implementation of a Forward+ (tiled forward) system for Unity, based on this article: https://www.3dgep.com/forward-plus/

Usage

• Add the component Forward Plus Manager to the camera
• Fill the fields Precompute Frustums and Light Culling with their corrisponding compute shaders from the folder Assets/ForwardPlus/Shaders/
• Add a texture in the Heatmap field, try with Assets/Demo/Textures/heatmap.png
• The field Debug_ShowGrid is a toggle to enable the visualization of the lights grid with an heatmap for the most populated tiles

To write a shader you need:

• Declare this resources:
  • Texture2D<uint2> g_lightsGrid
  • Buffer<uint> g_lightsIndexBuffer
  • StructuredBuffer<Light> g_lights
• In the fragment shader compute the tile coordinate, and use it to read from the g_lightsGrid. The x component is the number is the start offset in the buffer g_lightsIndexBuffer and the y component is the number of lights for the tile.
• Cycle for the number of lights and read first the index from g_lightsIndexBuffer and use it to get the light data from the buffer g_lights

There is an example diffuse shader in the folder Assets/Demo/Shaders/

Further Development

• Right now only point lights are supported, next i'll implement directional and spot
• Allow dynamically movable lights
• Make the system working also in the editor and not only in play mode

License

This project is licensed under the MIT License - see the LICENSE