za3k / ha3k-02-raytracer

Hack-A-Day 2023, Day 02. Raytracing demo

A simple raytracer written in C.

Based on a raytracer written aytracer written by kragen; and on Ray Tracing in One Weekend by Peter Shirley, Trevor David Black, Steve Hollasch.

Raytracing Progress

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Basics (one sphere, on/off color), Rectangular viewport

(1s/pix)

Basic coloring based on position ("normals")

(1s/pix)

Add ground (a big sphere) and two more spheres

(1s/pix)

Add antialiasing (and accidentally zoom out)

(10s/pix)

Add sky color

(10s/pix)

Add diffusion

(10s/pix)

Make diffusion more directional (Lambertian diffusion) and zoom back in

(10s/pix)

Increase (10x) random samples per pixel

(100s/pix)

Shift camera slightly to not intersect the ground

(100s/pix)

Gamma correction

(100s/pix)

Add color to spheres

(100s/pix)

Add reflectivity and varied fuzziness parameter

(100s/pix)

Final Scene

(1s/pix, 2s)
(10s/pix, 20s)
(100s/pix, 3m24s)
(1000s/pix, 33m)