v1.1.0 — Bug Fixes & Compatibility

v1.1.0 — Bug Fixes & Compatibility

Fixed

• Building inspector — replaced manual matrix unprojection with camera.unproject() using a near-plane depth offset (0.01) to avoid the infinity overflow produced by depth=1.0 in current Open3D builds
• Q to quit — key handler now correctly uses gui.KeyEvent.Type.DOWN instead of gui.KeyEvent.DOWN, which is unavailable on Windows builds
• set_background_color deprecation — replaced with set_background()
• gui.HorizSeparator unavailable — replaced with gui.Label("") spacers
• clear_3d_labels / add_3d_label on wrong object — moved label management to SceneWidget directly where the API is available

Notes

• Equation labels above rooftops are back via SceneWidget.add_3d_label()
• All fixes maintain compatibility with current Open3D releases on Windows

v1.0.0 — Initial Release

v1.0.0 — Initial Release

Factor City is an interactive 3D prime factorization visualizer built with Open3D. Each integer in a configurable grid is rendered as a tower of colored blocks, one floor per prime factor, where each prime has a distinct color.

Features

• 3D block towers encoding prime factorization of each number in the city grid
• 11-prime color palette (primes 2–31), gray fallback for larger primes
• Floating equation labels above each rooftop (n = p₁ × p₂ × …)
• Animated delivery truck orbiting the city with hopping motion
• Building inspector — click any tower to see its full factorization in the side panel
• Selected building highlight via color brightening
• Custom tower deployment — enter any integer ≥ 2 and place it in the grid at runtime
• Speed slider, animation toggle, and label toggle via side control panel
• Color-coded prime legend rendered in the 3D scene

Requirements

• Python 3.10+
• open3d ≥ 0.18.0
• numpy ≥ 1.26.0