Pathtracer

A personal project with the aim of creating a GPU Accelerated Pathtracer using OpenGL

Features

• Diffuse Rendering
• Specular Rendering
• Transmission and Refraction
• Polygons (Ray-Triangle Intersection)
• GPU Accelerated

How it developed

First it started with some simple Ray-Sphere Intersections and Basic Diffuse Lighting in Shadertoy

Raytracing without Accumulation, Dot Product Diffuse Lighting

Accumulation Without Tone Mapping

Specular Reflections

Diffuse Light Bounces

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Then I moved it to OpenGL, allowing much more advanced calculations, performance and controll

Sky and Ambient Light

Ray-Triangle Intersection, Polygons

Bloom

Transmission and Refraction, ImGUI

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At last, there is a more composed scene viewed in many ways

Scene without Bloom

Scene with Bloom

Scene without Bloom with Blender Denoise and Glare applied

Scene with Bloom and Blender Denoise

The Future

I consider the results as satisfactory, there are still some features missing such as caustics, proper light transmission/refraction and Skybox, but the main objective has been achieved for now

What I've Learned

• The Rendering Equation
• PBR
• Shader programming skills
• Understanding of how a modern renderer work
• Light interactions with objects and nature

Resources

• Sebastian Lague Code Adventure
• The Cherno Series
• Eduard0110 OpenGL Pathtracer
• Shadertoy Pathtracer Series