A cell-wide sprite is now actually a cell wide

Rubble drawn to span its gap stopped short of the posts, and the
ledger of blame is arithmetic: billboard widths scaled by the vertical
pixel ratio (H/depth) when horizontal pixels-per-world-unit is the
focal length over depth — about 1.4x larger. Every "one cell wide"
volume rendered at seventy percent. Sprites that declare an aspect now
mean WORLD width and use the horizontal scale, so rubble reaches post
to post and hedges brush both walls; plain square token sprites keep
their familiar pixel shape.

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

packages/web/src/fpv/FirstPerson.svelte

@@ -455,7 +455,13 @@
     const screenX = W / 2 + (side / depth) * (W / 2) / Math.tan(FOV / 2);
     const wallH = H / depth;
     const size = wallH * b.scale;
-    const wide = size * (b.aspect ?? 1);
+    // Vertical pixels scale by H/depth, horizontal by focal/depth — and
+    // they differ. A sprite that declares an aspect means WORLD width
+    // (a hedge one cell wide must touch both posts), so its width uses
+    // the horizontal scale; plain square sprites keep their pixel shape.
+    const wide = b.aspect
+      ? size * b.aspect * (((W / 2) / Math.tan(FOV / 2)) / H)
+      : size;
     const bottom = half + wallH / 2 - b.rise * wallH;
     return {
       src: b.src, depth: depth - (b.bias ?? 0), warped: b.warped,

packages/web/src/fpv/raycast.ts

@@ -339,7 +339,7 @@ export function billboards(
     if (content.kind === "thornbush" || content.kind === "rosebush") {
       out.push({
         ...at, src: `/terrain3d/${content.kind}.png`, fallback: content.kind,
-        scale: 0.5, aspect: 2.35, rise: 0, bias: 0.18, label: content.kind,
+        scale: 0.5, aspect: 2.1, rise: 0, bias: 0.18, label: content.kind,
       });
     } else if (content.kind === "ooze") {
       out.push({