How to Build a 3D Animated Website with Opus 5.5 (Full Guide)

Step-by-step account of building a scroll-driven 3D landing page from one illustration with Opus 5.5 in Claude Code in two messages. Opus split the page into AI video for the character, generated on a flat magenta background and keyed out, one three.js object, and scroll-pinned frame sequences. Includes both prompts, the video shot-list prompt, clip costs and a self-check step.