Uploaded February 2025 | Updated September 2026, 1 week ago

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I had been hoping to write a decent rotating cube demo ever since I started to get a sense of how fast the cpu was. This is the result of about 3500 lines of custom assembler code and far more time than I want to think about. The end result was far nicer than I had any right to expect! This video is about 20 seconds of demo and 25 minutes of technical discussion on the what/how. Hope you enjoy!

0:00 The Cube!
0:20 Introduction
1:01 Resolution
2:02 Maths
3:03 Object-View Transform
4:48 Perspective Transform
5:49 Viewport Transform
6:42 Demo: Vertices
6:58 Timing
8:36 Line drawing
10:23 Demo: Edges
10:50 Back-Face Culling
13:21 Demo: Culling
13:45 Rasterization
14:56 Demo: Solid filled
16:34 Lighting
19:45 Demo: Lighting
20:06 Buffer Optimizations
21:33 Demo: 30 Fps!
22:12 Polish
22:49 Demo: Final!
23:07 Outro
23:30 Development progression