From 5ae08e136864eb1faff633ed34bfae292dc3ccd9 Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Tue, 6 Oct 2026 18:07:23 +0200
Subject: [PATCH] Shadow on receiving voxel from edge to center

---
 assets/index.html | 46 +++++++++++++++++++++++-----------------------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/assets/index.html b/assets/index.html
index 326ddea..35c8a46 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -198,46 +198,46 @@
                 var hLeftNeighbor = heightMap[(wx - TILE) + ',' + wy] || 0;
                 var hFrontNeighbor = heightMap[wx + ',' + (wy + TILE)] || 0;
 
-                var shadowOnRight = h - hLeftNeighbor;
-                var shadowOnFront = h - hFrontNeighbor;
+                var shadowFromRight = hLeftNeighbor - h;
+                var shadowFromFront = hFrontNeighbor - h;
 
-                if (shadowOnRight > 0) {
-                    var shadowW = Math.min(shadowOnRight * 2, TILE);
+                if (shadowFromRight > 0) {
+                    var shadowW = Math.min(shadowFromRight * 2, TILE);
                     var tt = shadowW / TILE;
-                    var origin1 = project(wx + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
-                    var origin4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var p1 = project((wx - TILE) + GAP/2 + shadowW, wy + TILE - GAP/2, hLeftNeighbor * HEIGHT_UNIT);
-                    var p2 = project((wx - TILE) + GAP/2 + shadowW, wy + GAP/2, hLeftNeighbor * HEIGHT_UNIT);
+                    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);
 
                     renderList.push({
                         type: 'shadow',
                         points: [
+                            { x: target2[0], y: target2[1] },
                             { x: origin4[0], y: origin4[1] },
-                            { x: p1[0], y: p1[1] },
-                            { x: p2[0], y: p2[1] },
-                            { x: origin1[0], y: origin1[1] }
+                            { x: origin1[0], y: origin1[1] },
+                            { x: target3[0], y: target3[1] }
                         ],
-                        depth: (wx - TILE) + wy + hLeftNeighbor + 0.999
+                        depth: (wx - TILE) + wy + h + 0.999
                     });
                 }
 
-                if (shadowOnFront > 0) {
-                    var shadowW = Math.min(shadowOnFront * 2, TILE);
+                if (shadowFromFront > 0) {
+                    var shadowW = Math.min(shadowFromFront * 2, TILE);
                     var tt = shadowW / TILE;
-                    var origin3 = project(wx + TILE - GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var origin4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var p1 = project(wx + GAP/2, (wy + TILE) - GAP/2 - shadowW, hFrontNeighbor * HEIGHT_UNIT);
-                    var p2 = project(wx + TILE - GAP/2, (wy + TILE) - GAP/2 - shadowW, hFrontNeighbor * HEIGHT_UNIT);
+                    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);
 
                     renderList.push({
                         type: 'shadow',
                         points: [
-                            { x: origin4[0], y: origin4[1] },
-                            { x: p1[0], y: p1[1] },
-                            { x: p2[0], y: p2[1] },
-                            { x: origin3[0], y: origin3[1] }
+                            { x: target1[0], y: target1[1] },
+                            { x: target2[0], y: target2[1] },
+                            { x: origin3[0], y: origin3[1] },
+                            { x: origin4[0], y: origin4[1] }
                         ],
-                        depth: wx + (wy + TILE) + hFrontNeighbor + 0.999
+                        depth: wx + (wy + TILE) + h + 0.999
                     });
                 }
             }