RayTrace-Unity

A minimal GPU ray tracer built in Unity using a fragment shader.

Overview

This project demonstrates real-time ray tracing in Unity using the standard vertex and fragment pipeline. It renders reflective and emissive spheres entirely on the GPU.

How It Works

• Shader (myShader.shader)
  Performs ray sphere intersections and lighting directly in the fragment shader using basic vector mathematics. Sphere data is passed as a StructuredBuffer in the shader.

• Sphere Class (RayTracingSphere.cs)
  Defines per sphere properties such as color, reflectivity, luminosity, and emission color.

• Camera Class (CameraScript.cs)
  Populates a C# array of Sphere structs, uploads it to the GPU using a ComputeBuffer, and draws the scene with Graphics.Blit when ray tracing is enabled.

Features

• GPU based ray tracing using a fragment shader
• Supports multiple reflective and emissive spheres
• Adjustable bounce limit and accumulation for progressive blending
• Uses a C# array uploaded to the GPU via ComputeBuffer