Raytracer

Requires PythonExtra runtime to execute.

Raytracer renders a simple 3D scene using sphere tracing and diffuse lighting. Watch as rays intersect spheres and a checkerboard floor, computing normals and shading.

Features

• Perspective ray casting: projects 3D scene to 2D screen
• Sphere primitives: three colored spheres with hit detection
• Diffuse lighting: two light sources with ambient + directional shading
• Dual output: low-res preview + upscaled main render
• Progressive display: screen updates during computation

Usage

1. Copy render_raytracer.py to your calculator
2. Launch via PythonExtra from Hollyhock launcher
3. Wait for render (~15-30 seconds)
4. Press EXE, DEL, or EXIT to exit

Technical Notes

• Internal resolution: 64×64, upscaled 4× for display
• Sphere intersection via quadratic formula
• Floor: infinite plane at y=-1 with checkerboard pattern
• Colors: RGB565-compatible 0-31 channel range

Requirements

• CASIO ClassPad II (fx-CP400)
• Hollyhock-3 firmware
• PythonExtra runtime

A compact demonstration of 3D rendering fundamentals on calculator hardware.