A tile gains Collision scale: below 1 each blocking cell pulls in on the sides without a blocking neighbour and stays flush towards its neighbours, so a wall of bushes becomes a narrower wall without gaps and the inner corner of an L closes cleanly; above 1 the cell grows at its open sides; on several layers the largest value counts, and the merged rectangles work in fractions of a cell with exactly the old result at 1 (#140)

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

tools/e2e/40-tilemap.mjs

@@ -735,6 +735,39 @@ export async function tilemap(t) {
     stopped && Math.abs(stopped.x - -170) < 0.01,
     `world x=${stopped?.x}`,
   );
+
+  // Collision scale (#140), typed into the tile's field: 0.5 draws the boxes in by a quarter cell on
+  // their open sides only – the 3 × 3 block stays one rectangle – and lets the crate that much closer.
+  await select({ kind: 'asset', assetId: 'at-grass' });
+  await settle();
+  const scaleRow = await json("__gm.inspectorField('Collision scale')");
+  if (scaleRow) {
+    await click(scaleRow.x, scaleRow.y);
+    await press('a', { ctrl: true });
+    await typeText('0.5');
+    await press('Enter');
+  }
+  await settle();
+  const drawnIn = await json(`__gm.tilemap.solids(${JSON.stringify(MAP_OBJECT)})`);
+  check(
+    'a tile has a Collision scale field; at 0.5 the outline is drawn in on the open sides, the block still one rectangle',
+    (await t.asset('at-grass'))?.props.collisionScale === 0.5 &&
+      JSON.stringify(drawnIn?.rects) ===
+        JSON.stringify([
+          { x: 0.25, y: 0.25, w: 2.5, h: 2.5 },
+          { x: 4.25, y: 0.25, w: 0.5, h: 0.5 },
+        ]),
+    JSON.stringify({ scaleRow, props: (await t.asset('at-grass'))?.props, drawnIn }),
+  );
+  await evaluate('__gm.state.select(null)');
+  await settle();
+  const closer = await playAgainstMap();
+  check(
+    'with the smaller box the crate comes a quarter cell closer before it stops',
+    closer && Math.abs(closer.x - -158) < 0.01,
+    `world x=${closer?.x}`,
+  );
+  await mutate("delete __gm.state.project.assets.find((a) => a.id === 'at-grass').props.collisionScale");
   await mutate("__gm.state.project.assets.find((a) => a.id === 'at-grass').props.solid = false");
   const passed = await playAgainstMap();
   check(