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Convert to voxel terrain: stable tiles, animated heights only

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Richard Zink committed 2026-10-06 17:04:15 +02:00
1 parent 7a3142ddd1
commit 273fcc2390
1 file changed
+90 -57
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assets/index.html
+90 -57
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@@ -3,7 +3,7 @@
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Isometric Tiles</title>
<title>Isometric Voxel Terrain</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { overflow: hidden; background: #000; }
@@ -17,6 +17,7 @@
var ctx = c.getContext('2d');
var W, H;
var TILE = 32;
var HEIGHT_UNIT = 6;
function resize() {
W = c.width = window.innerWidth;
@@ -25,45 +26,45 @@
window.addEventListener('resize', resize);
resize();
var offX = 0, offY = 0;
var speedX = 0, speedY = 0;
var targetSpeedX = 0, targetSpeedY = 2;
var angle = Math.PI / 6;
function project(x, y, z) {
var fov = 600;
var scale = fov / (600 + z);
var cosA = Math.cos(angle);
var sinA = Math.sin(angle);
var isoX = x * cosA - y * cosA;
var isoY = x * sinA + y * sinA - z;
var sx = isoX * scale + W / 2;
var sy = isoY * scale + H / 2;
return [sx, sy, scale];
function project(x, y, z) {
var scale = 1;
var isoX = (x - y) * cosA * scale;
var isoY = ((x + y) * sinA - z) * scale;
var sx = isoX + W / 2;
var sy = isoY + H / 2;
return [sx, sy];
}
function getHeight(x, y) {
function getHeight(x, y, time) {
var h = 0;
h += Math.sin(x * 0.02) * 4;
h += Math.cos(y * 0.02) * 4;
h += Math.sin(x * 0.04 + y * 0.02) * 2;
h += Math.cos(y * 0.04 - x * 0.02) * 1.5;
return h;
h += Math.sin(x * 0.03 + time * 0.5) * 3;
h += Math.cos(y * 0.03 + time * 0.4) * 3;
h += Math.sin(x * 0.05 + y * 0.03 + time * 0.3) * 1.5;
h += Math.cos(y * 0.05 - x * 0.03 + time * 0.6) * 1;
return Math.round(h);
}
function isWater(h) {
return h <= -2;
}
var time = 0;
var tiles = [];
function generateTiles() {
tiles = [];
var rangeX = Math.ceil(W / TILE) + 4;
var rangeY = Math.ceil(H / TILE) + 4;
var rangeX = Math.ceil(W / (TILE * cosA * 2)) + 2;
var rangeY = Math.ceil(H / (TILE * sinA * 2)) + 2;
for (var x = -rangeX; x <= rangeX; x++) {
for (var y = -rangeY; y <= rangeY; y++) {
var wx = x * TILE + offX;
var wy = y * TILE + offY;
var h = getHeight(wx, wy);
var wx = x * TILE;
var wy = y * TILE;
var h = getHeight(wx, wy, time);
tiles.push({ x: wx, y: wy, h: h });
}
}
@@ -78,52 +79,84 @@
var t = tiles[i];
var wx = t.x, wy = t.y, h = t.h;
var x1 = wx, y1 = wy + TILE, z1 = h;
var x2 = wx + TILE, y2 = wy + TILE, z2 = getHeight(wx + TILE, wy + TILE);
var x3 = wx + TILE, y3 = wy, z3 = getHeight(wx + TILE, wy);
var x4 = wx, y4 = wy, z4 = h;
var water = isWater(h);
var topColor = water ? '#2299dd' : '#33aa33';
var leftColor = water ? '#1166aa' : '#226622';
var rightColor = water ? '#0d4477' : '#114411';
var p1 = project(x1, y1, z1);
var p2 = project(x2, y2, z2);
var p3 = project(x3, y3, z3);
var p4 = project(x4, y4, z4);
if (h > 0) {
var lighting = 0.5 + Math.max(0, sinA * 0.3 + 0.2);
topColor = applyLighting(topColor, lighting);
leftColor = applyLighting(leftColor, lighting * 0.7);
rightColor = applyLighting(rightColor, lighting * 0.5);
} else if (water) {
topColor = '#2299dd';
leftColor = '#1166aa';
rightColor = '#0d4477';
}
if (p1[1] < -100 || p1[1] > H + 100) continue;
if (p4[1] < -100 || p4[1] > H + 100) continue;
var top1 = project(wx, wy + TILE, h * HEIGHT_UNIT);
var top2 = project(wx + TILE, wy + TILE, h * HEIGHT_UNIT);
var top3 = project(wx + TILE, wy, h * HEIGHT_UNIT);
var top4 = project(wx, wy, h * HEIGHT_UNIT);
var water = h < 2;
var baseR = water ? 0 : 0;
var baseG = water ? 80 : 140;
var baseB = water ? 180 : 0;
var lighting = 0.4 + Math.max(0, Math.sin(angle) * 0.5 + 0.3);
var r = Math.floor(baseR * lighting);
var g = Math.floor(baseG * lighting);
var b = Math.floor(baseB * lighting);
ctx.fillStyle = 'rgb(' + r + ',' + g + ',' + b + ')';
ctx.fillStyle = topColor;
ctx.beginPath();
ctx.moveTo(p1[0], p1[1]);
ctx.lineTo(p2[0], p2[1]);
ctx.lineTo(p3[0], p3[1]);
ctx.lineTo(p4[0], p4[1]);
ctx.moveTo(top1[0], top1[1]);
ctx.lineTo(top2[0], top2[1]);
ctx.lineTo(top3[0], top3[1]);
ctx.lineTo(top4[0], top4[1]);
ctx.closePath();
ctx.fill();
ctx.strokeStyle = water ? 'rgba(0, 200, 255, 0.5)' : 'rgba(0, 255, 100, 0.5)';
ctx.lineWidth = 0.5;
ctx.stroke();
if (h !== 0 || water) {
var bot1 = project(wx, wy + TILE, 0);
var bot2 = project(wx + TILE, wy + TILE, 0);
var bot3 = project(wx + TILE, wy, 0);
var bot4 = project(wx, wy, 0);
ctx.fillStyle = leftColor;
ctx.beginPath();
ctx.moveTo(bot4[0], bot4[1]);
ctx.lineTo(top4[0], top4[1]);
ctx.lineTo(top1[0], top1[1]);
ctx.lineTo(bot1[0], bot1[1]);
ctx.closePath();
ctx.fill();
ctx.fillStyle = rightColor;
ctx.beginPath();
ctx.moveTo(bot3[0], bot3[1]);
ctx.lineTo(top3[0], top3[1]);
ctx.lineTo(top4[0], top4[1]);
ctx.lineTo(bot4[0], bot4[1]);
ctx.closePath();
ctx.fill();
}
if (h > 0) {
ctx.strokeStyle = 'rgba(0, 0, 0, 0.4)';
ctx.lineWidth = 1;
ctx.strokeRect(top1[0], top1[1], top3[0] - top1[0], top3[1] - top1[1]);
}
}
}
function applyLighting(color, factor) {
var r = parseInt(color.substr(1, 2), 16);
var g = parseInt(color.substr(3, 2), 16);
var b = parseInt(color.substr(5, 2), 16);
r = Math.floor(r * factor);
g = Math.floor(g * factor);
b = Math.floor(b * factor);
return 'rgb(' + r + ',' + g + ',' + b + ')';
}
function frame() {
ctx.fillStyle = '#001020';
ctx.fillRect(0, 0, W, H);
speedX += (targetSpeedX - speedX) * 0.05;
speedY += (targetSpeedY - speedY) * 0.05;
offX += speedX;
offY += speedY;
time += 0.02;
generateTiles();
drawTiles();