The scene view outlines a tilemap's collision only along its outer edges: where two pieces meet, their shared stretch runs once in each direction and is not drawn, so an autotile lake is one outline without cross strokes at the quarters, merged rectangles of plain tiles and one-way tiles follow the same rule, the bridges from splitting concave outlines disappear and a piece doubled on two layers is outlined once; fill and collision stay as they were, and the result is cached per tilemap and rebuilt only when its collision data changes (#173)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -38,7 +38,7 @@ npm run build        # writes dist/ and regenerates index.html; the folder is wh
 The browser suite and the three example games need a machine with a GPU:
 
 ```bash
-node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 1073 checks (GM_STEPS=20 for one step)
+node tools/seed-e2e.mjs && node tools/e2e.mjs      # the editor, 1074 checks (GM_STEPS=20 for one step)
 node tools/seed-jumprun.mjs && node tools/smoke-jumprun.mjs
 node tools/seed-tetris.mjs && node tools/smoke-tetris.mjs
 node tools/seed-actor.mjs && node tools/smoke-actor.mjs