From 700db70d4e84eb376bf57841ea3059d6fe9a6ef1 Mon Sep 17 00:00:00 2001
From: Eric Wagoner <ewagoner@gmail.com>
Date: Sun, 23 Aug 2026 19:39:26 -0400
Subject: [PATCH] A cell-wide sprite is now actually a cell wide
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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 | 8 +++++++-
 packages/web/src/fpv/raycast.ts         | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/web/src/fpv/FirstPerson.svelte b/packages/web/src/fpv/FirstPerson.svelte
index 9b70ca3..3e43fab 100644
--- a/packages/web/src/fpv/FirstPerson.svelte
+++ b/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,
diff --git a/packages/web/src/fpv/raycast.ts b/packages/web/src/fpv/raycast.ts
index 102ea79..6823c4a 100644
--- a/packages/web/src/fpv/raycast.ts
+++ b/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({