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Ryan GattisGraphics & Systems Projects

Renderers, tools, and other things I build.

Personal projects, mostly real-time graphics and the tooling around it: Vulkan and OpenGL renderers, shader tools, GPU compute, and a networked simulation in Rust. Everything here is public on GitHub; where a project's implementation was AI-generated, its page says so and describes what I directed.

Voxel terrain rendered with per-vertex ambient occlusion

Vulkan Voxel Engine

Vulkan 1.3 voxel terrain renderer with OpenXR stereo rendering and multithreaded procedural generation.

C++23
Vulkan
OpenXR
GLSL
+4

Plant-evolution cellular automaton rendered in the wgpu viewer

simulife-rs

Client-server evolutionary cellular automaton, optimized from captured Chrome traces rather than guesswork.

Rust
QUIC
wgpu
tokio
+3

$Path-traced 3D fractal with global illumination$

OpenCL Path Tracer

Monte Carlo path tracer solving the rendering equation on the GPU, applied to 3D fractal geometry.

C++
OpenCL
libpng
CMake

Raymarched scene rendered in the OpenGL shader viewer

Shader Viewer 4

OpenGL fragment shader viewer with a physics-based camera and hot reload.

C++
OpenGL
GLSL
SDL2
+3

Layer diagram — glass depends on glass-ecs and steel; steel wraps Vulkan, SDL3 and OpenXR; glass-ecs links only glm

Material Engine

Reusable Vulkan engine library — a Vulkan RAII layer, an engine layer, and a standalone ECS.

C++23
Vulkan
OpenXR
CMake
+3

Utah teapot wireframe drawn in pen on paper by a converted 3D printer

Mesh SVG Tool

Renders 3D meshes as wireframe SVG with hidden edge elimination, built for pen plotters.

C++
OpenMesh
CMake
vcpkg

$Mandelbox fractal detail rendered in the Vulkan fragment shader viewer$

Vulkan Fragment Renderer

Real-time GLSL shader viewer with hot reload, stereo XR rendering, and depth-buffer compositing.

C++23
Vulkan
OpenXR
GLSL
+3

Utah teapot rendered by the CPU software rasterizer

Software Renderer

A low-dependency 3D rasterizer written from scratch on the CPU.

C++
SDL2
GLM
CMake