PSEC-99: A 3D Browser Game in C# and WASM, Without WebGL

Description and use

PSEC‑99 demonstrates a 3D browser game built with C# and WebAssembly that renders directly into a single pixel buffer, avoiding WebGL and achieving efficient performance.

Problem

Web apps often struggle with CPU and memory usage when rendering simple UIs, yet a 3D game can run efficiently in the browser using C# and WebAssembly.

Outcome

PSEC‑99 demonstrates that a 3D browser game can run efficiently using pure C# and WebAssembly, avoiding WebGL and reducing CPU/memory overhead.

Workflow

• 1. Convert the 1982 TI‑99/4A game into a 3D model.
• 2. Implement 3D math, projection and rasterization in C#.
• 3. Render the scene into a single int[] pixel buffer row by row.
• 4. Use OpenSilver’s WriteableImage to copy the buffer to an HTML canvas.
• 5. Play the game in the browser (or run locally with .NET 10/WASM).

Evidence

They took a 1982 TI-99/4A game and turned it into a 3D browser experience using C#/WASM and an int[] pixel buffer. No WebGL.

Source

Their entire 3D scene is drawn in C# into a single pixel buffer (yes, just one!) in .NET memory, then displayed on an HTML canvas through OpenSilver 3.4 Preview’s new WriteableImage XAML control.

Source