Bū tools
Topology
Clean quads: edges and circles.
What it does
Answers two touchy questions of basic topology, in quads only, with a drawing each time.
The two modes
- Edges: 5 edges on one side, 3 on the other: the patch between them. The drawing places 3 → 1 reductions, one row after another if needed. An odd difference (3 → 2) can’t be done in quads only: one edge leaves on the side.
- Circle: how many segments a circle needs to merge cleanly into a grid. A multiple of 4 fits a square (12 → 3 × 3 faces), an even number a rectangle, an odd number needs a triangle. The same number caps a cylinder.
Good to know
The poles (points where 3 or 5 edges meet instead of 4) are in orange. Put them on flat areas that won’t deform much (not on a joint or a lip), away from where the light catches the surface.
Free, no account, nothing is sent: it runs in your browser, even offline.
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