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Shadow falls on lower neighbor in light direction

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Richard Zink committed 2026-10-06 18:04:57 +02:00
1 parent 59077670ba
commit ac5db93beb
1 file changed
+26 -26
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assets/index.html
+26 -26
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@@ -195,49 +195,49 @@
} }
if (h > 0) { if (h > 0) {
var hRightNeighbor = heightMap[(wx + TILE) + ',' + wy] || 0; var hLeftNeighbor = heightMap[(wx - TILE) + ',' + wy] || 0;
var hBackNeighbor = heightMap[wx + ',' + (wy - TILE)] || 0; var hFrontNeighbor = heightMap[wx + ',' + (wy + TILE)] || 0;
var shadowFromRight = hRightNeighbor - h; var shadowOnRight = h - hLeftNeighbor;
var shadowFromBack = hBackNeighbor - h; var shadowOnFront = h - hFrontNeighbor;
if (shadowFromRight > 0) { if (shadowOnRight > 0) {
var shadowW = Math.min(shadowFromRight * 2, TILE); var shadowW = Math.min(shadowOnRight * 4, TILE);
var tt = shadowW / TILE; var tt = shadowW / TILE;
var top2 = project(wx + TILE - GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT); var target2 = project((wx - TILE) + GAP/2 + (TILE - GAP) * tt, wy + TILE - GAP/2, hLeftNeighbor * HEIGHT_UNIT);
var top3 = project(wx + TILE - GAP/2, wy + GAP/2, h * HEIGHT_UNIT); var target3 = project((wx - TILE) + GAP/2 + (TILE - GAP) * tt, wy + GAP/2, hLeftNeighbor * HEIGHT_UNIT);
var topA = project(wx + TILE - GAP/2 - (TILE - GAP) * tt, wy + TILE - GAP/2, h * HEIGHT_UNIT); var origin1 = project(wx + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT);
var topB = project(wx + TILE - GAP/2 - (TILE - GAP) * tt, wy + GAP/2, h * HEIGHT_UNIT); var origin4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
renderList.push({ renderList.push({
type: 'shadow', type: 'shadow',
points: [ points: [
{ x: top2[0], y: top2[1] }, { x: origin4[0], y: origin4[1] },
{ x: topA[0], y: topA[1] }, { x: target2[0], y: target2[1] },
{ x: topB[0], y: topB[1] }, { x: target3[0], y: target3[1] },
{ x: top3[0], y: top3[1] } { x: origin1[0], y: origin1[1] }
], ],
depth: wx + wy + 0.999 depth: (wx - TILE) + wy + hLeftNeighbor + 0.999
}); });
} }
if (shadowFromBack > 0) { if (shadowOnFront > 0) {
var shadowW = Math.min(shadowFromBack * 2, TILE); var shadowW = Math.min(shadowOnFront * 4, TILE);
var tt = shadowW / TILE; var tt = shadowW / TILE;
var top1 = project(wx + GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT); var target1 = project(wx + GAP/2, (wy + TILE) - GAP/2 - (TILE - GAP) * tt, hFrontNeighbor * HEIGHT_UNIT);
var top2 = project(wx + TILE - GAP/2, wy + TILE - GAP/2, h * HEIGHT_UNIT); var target2 = project(wx + TILE - GAP/2, (wy + TILE) - GAP/2 - (TILE - GAP) * tt, hFrontNeighbor * HEIGHT_UNIT);
var topA = project(wx + GAP/2, wy + TILE - GAP/2 - (TILE - GAP) * tt, h * HEIGHT_UNIT); var origin3 = project(wx + TILE - GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
var topB = project(wx + TILE - GAP/2, wy + TILE - GAP/2 - (TILE - GAP) * tt, h * HEIGHT_UNIT); var origin4 = project(wx + GAP/2, wy + GAP/2, h * HEIGHT_UNIT);
renderList.push({ renderList.push({
type: 'shadow', type: 'shadow',
points: [ points: [
{ x: top1[0], y: top1[1] }, { x: origin4[0], y: origin4[1] },
{ x: topA[0], y: topA[1] }, { x: target2[0], y: target2[1] },
{ x: topB[0], y: topB[1] }, { x: target1[0], y: target1[1] },
{ x: top2[0], y: top2[1] } { x: origin3[0], y: origin3[1] }
], ],
depth: wx + wy + 0.999 depth: wx + (wy + TILE) + hFrontNeighbor + 0.999
}); });
} }
} }