Tag
3 posts
geometry
6 min read
A building went missing from the 3D layer. Tile clipping had split its footprint into two pieces; the tiler flattened both outers into one rings array, and the extrusion consumer read everything after rings[0] as a hole — so piece #2 was earcut-punched out of piece #1's roof. Walls survived, roofs vanished, n pieces rendered n-1 roofs. The 2D fill was pixel-perfect the whole time, and zero tests had ever fed the consumer more than one polygon.
geometry
6 min read
A concave country's label rendered offshore because the anchor was the bounding-box centre — a point the polygon does not contain. The fix is a guaranteed-interior point, but the harder call was shipping it from a session with no GPU to re-check the pixels.
projections
8 min read
Adjacent map tiles projected the same vertex 40,075 km apart — one full world circumference. A rotated projection's unavoidable branch cut, resolved per tile, scattered the seam across every tile join; the fix relocates it to the one edge geometry expects.
