diff --git a/assets/index.html b/assets/index.html
index cc8d579..1da997d 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -193,19 +193,19 @@
             }
 
             if (h > 0) {
-                var hFrontNeighbor2 = heightMap[(wx + TILE) + ',' + wy] || 0;
-                var hBackNeighbor2 = heightMap[wx + ',' + (wy - TILE)] || 0;
+                var hRightNeighbor = heightMap[(wx + TILE) + ',' + wy] || 0;
+                var hLeftNeighbor = heightMap[wx + ',' + (wy - TILE)] || 0;
 
-                var shadowFront = hFrontNeighbor2 - h;
-                var shadowBack = hBackNeighbor2 - h;
+                var shadowFromRight = hRightNeighbor - h;
+                var shadowFromLeft = hLeftNeighbor - h;
 
-                if (shadowFront > 0) {
-                    var shadowW = Math.min(shadowFront * 2, TILE);
+                if (shadowFromRight > 0) {
+                    var shadowW = Math.min(shadowFromRight * 2, TILE);
                     var tt = shadowW / TILE;
                     var top2 = project(wx + TILE - GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
                     var top3 = project(wx + TILE - GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var topA = project(wx + TILE - GAP/2, wy + TILE - GAP/2 - (TILE - GAP) * tt, h * HEIGHT_UNIT);
-                    var topB = project(wx + TILE - GAP/2, wy + GAP/2 + (TILE - GAP) * tt, h * HEIGHT_UNIT);
+                    var topA = project(wx + TILE - GAP/2 - (TILE - GAP) * tt, wy + TILE - GAP/2, h * HEIGHT_UNIT);
+                    var topB = project(wx + TILE - GAP/2 - (TILE - GAP) * tt, wy + GAP/2, h * HEIGHT_UNIT);
 
                     shadows.push({
                         points: [
@@ -218,20 +218,20 @@
                     });
                 }
 
-                if (shadowBack > 0) {
-                    var shadowW = Math.min(shadowBack * 2, TILE);
+                if (shadowFromLeft > 0) {
+                    var shadowW = Math.min(shadowFromLeft * 2, TILE);
                     var tt = shadowW / TILE;
                     var top1 = project(wx + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
                     var top4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
-                    var topA = project(wx + GAP/2 + (TILE - GAP) * tt, wy + TILE - GAP/2, h * HEIGHT_UNIT);
-                    var topB = project(wx + GAP/2 + (TILE - GAP) * tt, wy + GAP/2, h * HEIGHT_UNIT);
+                    var topA = project(wx + GAP/2, wy + TILE - GAP/2 - (TILE - GAP) * tt, h * HEIGHT_UNIT);
+                    var topB = project(wx + GAP/2, wy + GAP/2 - (TILE - GAP) * tt, h * HEIGHT_UNIT);
 
                     shadows.push({
                         points: [
-                            { x: top4[0], y: top4[1] },
+                            { x: top1[0], y: top1[1] },
                             { x: topA[0], y: topA[1] },
                             { x: topB[0], y: topB[1] },
-                            { x: top1[0], y: top1[1] }
+                            { x: top4[0], y: top4[1] }
                         ],
                         depth: (wx + wy) + 1
                     });