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>

src/core/model/tile.ts

@@ -20,6 +20,10 @@ export const TILE_FPS_KEY = 'fps';
 export const TILE_PLAYBACK_KEY = 'playback';
 /** Whether a cell of this tile blocks movement in the running game (#132). */
 export const TILE_SOLID_KEY = 'solid';
+/** How big the blocking box of a cell is against the cell, 1 = the whole cell (#140). */
+export const TILE_COLLISION_SCALE_KEY = 'collisionScale';
+export const TILE_COLLISION_SCALE_MIN = 0.1;
+export const TILE_COLLISION_SCALE_MAX = 2;
 
 /** Only the two that make sense for a tile that is always on screen; there is no end to hold. */
 export const TILE_PLAYBACKS = ['loop', 'pingpong'] as const;
@@ -45,6 +49,13 @@ export function isTileSolid(asset: TileAsset): boolean {
   return asset.props[TILE_SOLID_KEY] === true;
 }
 
+/** The collision scale, held to the range the field offers; anything unreadable is the whole cell. */
+export function tileCollisionScale(asset: TileAsset): number {
+  const scale = Number(asset.props[TILE_COLLISION_SCALE_KEY] ?? 1);
+  if (!Number.isFinite(scale)) return 1;
+  return Math.min(TILE_COLLISION_SCALE_MAX, Math.max(TILE_COLLISION_SCALE_MIN, scale));
+}
+
 export function tileFps(asset: TileAsset): number {
   const fps = Number(asset.props[TILE_FPS_KEY]);
   return Number.isFinite(fps) && fps > 0 ? fps : 0;