From 1c0c785e3e07bf50e20f5ef49d7434676930ec0a Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Tue, 6 Oct 2026 18:08:41 +0200
Subject: [PATCH] Shadow starts at adjacent edge of receiving voxel

---
 assets/index.html | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/assets/index.html b/assets/index.html
index 35c8a46..e5beb7f 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -204,40 +204,40 @@
                 if (shadowFromRight > 0) {
                     var shadowW = Math.min(shadowFromRight * 2, TILE);
                     var tt = shadowW / TILE;
-                    var target2 = project((wx - TILE) + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
-                    var target3 = project((wx - TILE) + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var origin4 = project(wx + GAP/2 + shadowW, wy + TILE - GAP/2 - shadowW, h * HEIGHT_UNIT);
-                    var origin1 = project(wx + GAP/2 + shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
+                    var edge1 = project(wx + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
+                    var edge4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
+                    var mid1 = project(wx + GAP/2 + shadowW, wy + TILE - GAP/2 - shadowW, h * HEIGHT_UNIT);
+                    var mid2 = project(wx + GAP/2 + shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
 
                     renderList.push({
                         type: 'shadow',
                         points: [
-                            { x: target2[0], y: target2[1] },
-                            { x: origin4[0], y: origin4[1] },
-                            { x: origin1[0], y: origin1[1] },
-                            { x: target3[0], y: target3[1] }
+                            { x: edge4[0], y: edge4[1] },
+                            { x: edge1[0], y: edge1[1] },
+                            { x: mid1[0], y: mid1[1] },
+                            { x: mid2[0], y: mid2[1] }
                         ],
-                        depth: (wx - TILE) + wy + h + 0.999
+                        depth: wx + wy + h + 0.999
                     });
                 }
 
                 if (shadowFromFront > 0) {
                     var shadowW = Math.min(shadowFromFront * 2, TILE);
                     var tt = shadowW / TILE;
-                    var target1 = project(wx + GAP/2, (wy + TILE) - GAP/2, h * HEIGHT_UNIT);
-                    var target2 = project(wx + TILE - GAP/2, (wy + TILE) - GAP/2, h * HEIGHT_UNIT);
-                    var origin4 = project(wx + GAP/2 + shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
-                    var origin3 = project(wx + TILE - GAP/2 - shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
+                    var edge3 = project(wx + TILE - GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
+                    var edge4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
+                    var mid1 = project(wx + GAP/2 + shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
+                    var mid2 = project(wx + TILE - GAP/2 - shadowW, wy + GAP/2 + shadowW, h * HEIGHT_UNIT);
 
                     renderList.push({
                         type: 'shadow',
                         points: [
-                            { x: target1[0], y: target1[1] },
-                            { x: target2[0], y: target2[1] },
-                            { x: origin3[0], y: origin3[1] },
-                            { x: origin4[0], y: origin4[1] }
+                            { x: edge4[0], y: edge4[1] },
+                            { x: edge3[0], y: edge3[1] },
+                            { x: mid2[0], y: mid2[1] },
+                            { x: mid1[0], y: mid1[1] }
                         ],
-                        depth: wx + (wy + TILE) + h + 0.999
+                        depth: wx + wy + h + 0.999
                     });
                 }
             }