RT86 is a re-implementation of ray tracing in one weekend to run on MS-DOS. The project brings modern rendering techniques into the world of 16-bit DOS systems. With RT86, you can witness fundamental concepts like ray-object intersection, reflections, and refractions – all from within a nostalgic DOS environment.

• Anti-Aliasing: Smoothens the output by averaging multiple rays per pixel to reduce jagged edges.
• Refraction & Reflection: Simulates transparent materials like glass with Snell’s Law and internal reflection. Materials scatter or reflect light based on surface properties.
• Defocus Blur: Simulates depth of field, mimicking a camera lens's behavior to create blurred backgrounds.
• Recursive Ray Tracing: Supports multiple reflection and refraction bounces for lifelike visuals.
• Camera System: Simulates a basic camera with a configurable viewport and field of view.
• Multiple Objects: Ability to add multiple spheres with distinct materials.
• Fixed Palette Output: Optimized for VGA graphics (320x200 resolution, 256 colors).
• Hand-Tuned Assembly Optimizations: Highly optimized pixel writing routine for fast VRAM operations.

RT86 uses ray tracing techniques to render scenes by simulating the behavior of light. For each pixel, it performs:

• Casts a ray from the camera through the pixel into the scene.
• If a ray hits an object, it determines how the light interacts with the surface.
• Reflection and refraction rays are recursively traced for transparency effects.
• Multiple rays per pixel enable anti-aliasing and defocus blur.

• Turbo C++ (>= 3.0)
• Turbo Assembler (>= 4.1)
• DOSBox or a real DOS computer

If you want to build rt86 from source, you'll need Turbo C++ and the related build tools.

C:\TC\BIN>MAKE.EXE
C:\TC\BIN>RT86.EXE

This project is licensed under the MIT License. See the LICENSE file for details.

This project is based on RT in One Weekend