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Program thumbnail for "{props.program.title}"

Title	Volumetric Cloud
ID	6328860941139968
Created	8 months ago, 1715417926502
Updated	8 months ago, 1715417926328
Code	// Convergence is very slow draw = function() { this.frameRate(0); var _sin = this.Math.sin, _cos = this.Math.cos, _sqrt = this.Math.sqrt, _exp = this.Math.exp, _max = this.Math.max, _min = this.Math.min, _pow = this.Math.pow, _abs = this.Math.abs, _noise = this.noise, _lerp = this.lerp, _width = this.width, _height = this.height, _updatePixels = this.updatePixels; var lx = -5, ly = -10, lz = 0; var nl = 1 / _sqrt(lx * lx + ly * ly + lz * lz); lx = nl; ly = nl; lz = nl; function fbm(x, y, z) { var n = 0; var h = 1; var f = 1; for (var i = 0; i < 2; ++i) { h = 0.5; f = 2; n += _noise(x f, y * f, z * f) * h; } return _abs(n * 2 - 1); } function densAtPoint(x, y, z) { return _max(_noise(x * 2, y * 2, z * 2) - _min(_sqrt(x * x * 0.5 + y * y + z * z * 0.5), 1), 0); } function randomVec3() { var x, y, z; while (true) { x = random(-1, 1); y = random(-1, 1); z = random(-1, 1); if (_sqrt(x * x + y * y + z * z) <= 1) { return [x, y, z]; } } } var colorBuffer = []; colorBuffer.length = (_width * _height) << 2; colorBuffer.fill(0); var camx = 0, camy = 0; var j = 0; var iterations = 1; this.loadPixels(); var id = this.imageData.data; this.draw = function() { if (j >= _height) { iterations++; j = 0; } for (var i = 0; i < _width; ++i) { var invHeight = 1 / _height; var u = (i - 0.5 * _width) * invHeight; var v = (j - 0.5 * _height) * invHeight; var bounces = 0; var dist = 0; var r = 1, g = 1, b = 1; var stepSize = 0.1; var attenuation = 0; var dx = u, dy = -v, dz = 1; var nd = 1 / _sqrt(dx * dx + dy * dy + 1); dx = nd; dy = nd; dz = nd; var ox = camx, oy = camy, oz = -2; var sampleX = ox + dx * random(0, 1) * stepSize, sampleY = oy + dy * random(0, 1) * stepSize, sampleZ = oz + dz * random(0, 1) * stepSize; for (var samples = 0; samples < 1200 && bounces < 128 && dist < 32 && _sqrt(sampleX * sampleX + sampleY * sampleY + sampleZ * sampleZ) < 4; ++samples) { attenuation = _exp(-densAtPoint(sampleX, sampleY, sampleZ) * 256); if (attenuation < random(0, 1)) { r = 0.9; g = 0.9; b = 0.9; var d = randomVec3(); dx = d[0]; dy = d[1]; dz = d[2]; var nd = 1 / _sqrt(dx dx + dy * dy + dz * dz); dx = nd; dy = nd; dz = nd; bounces++; } sampleX += dx stepSize; sampleY += dy * stepSize; sampleZ += dz * stepSize; dist += stepSize; } var dl = _pow(_max(0, dx * -lx + dy * -ly + dz * -lz), 500); var skyR = dl; var skyG = dl; var skyB = dl; r = _lerp(0.6, 500, skyR); g = _lerp(0.8, 500, skyG); b = _lerp(1, 500, skyB); var fi = (i + j _height) << 2; colorBuffer[fi] = _lerp(colorBuffer[fi], r, 1 / iterations); colorBuffer[fi + 1] = _lerp(colorBuffer[fi + 1], g, 1 / iterations); colorBuffer[fi + 2] = _lerp(colorBuffer[fi + 2], b, 1 / iterations); colorBuffer[fi + 3] = 255; id[fi] = colorBuffer[fi] * 255; id[fi + 1] = colorBuffer[fi + 1] * 255; id[fi + 2] = colorBuffer[fi + 2] * 255; id[fi + 3] = 255; } _updatePixels(); j++; }; };
Folds	2,148
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIXCxIKU2NyYXRjaHBhZBiAgOuhjIKfCww
Votes	1
Spin-Offs	0
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	null
Hidden From Hotlist	false
Restricted Posting	true
By Child	false
Author Nick	Fifth
Author Name	FifthStateOfMatter
Author ID	kaid_1065213098995021368328526
Author Profile Access	PUBLIC

Archive Data

Added	8 months ago, 1715418246426
Updated	8 months ago, 1715418246426
Source Deleted	unknown