SectionLab: 3D Geometry Lab

SectionLab transforms abstract geometry into a hands-on, visual experience. Perfect for students, teachers, and anyone curious about how 2D relates to 3D.

BUILD mode — See 2D become 3D
Watch flat shapes transform into solid objects through three different mechanisms:
• Rotate: Spin a rectangle into a cylinder, a triangle into a cone, or a semicircle into a sphere
• Translate: Extrude a circle upward to form a cylinder, or a square into a cube
• Roll: Curl a flat plane into a cylindrical surface

Drag the progress slider to control how far the transformation goes, or hit Auto Play for a seamless demonstration.

CUT mode — Slice 3D shapes to see inside
Choose from five geometric solids (cube, cuboid, cylinder, cone, triangular prism) and cut them with an adjustable slicing plane:
• Move the cutting plane up/down and tilt it in any direction
• Pull the two halves apart to examine the cross-section in detail
• Toggle visibility of each half to focus on either side
• Use the Cross-Section Dictionary for instant access to classic cuts (circle, ellipse, triangle, hexagon, and more)

Why SectionLab?
• Fully interactive 3D — pan, rotate, and zoom with touch gestures
• No internet required — all 3D rendering runs locally
• Multi-language support: English, 中文, 日本語, 한국어
• iPad-optimized with large touch targets
• Clean, distraction-free interface designed for focused learning

Perfect for:
- Middle school and high school geometry students
- Teachers looking for classroom demonstration tools
- Self-learners exploring spatial reasoning
- Anyone curious about the math behind 3D shapes