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

Title	Textured egg
ID	6077916504522752
Created	10 years ago, 1449754507429
Updated	9 years ago, 1477846548673
Code	// Bump-mapping using techniques from: // https://www.khanacademy.org/computer-programming/sphere/1744699339 // Egg shape based on information at: // http://www.mathematische-basteleien.de/eggcurves.htm var lightZ = 80; var lightZ2 = lightZ * lightZ; var eggX = 200; var eggY = 200; var eggHeight = 120; var eggWidth = 80; var eggHeight2 = eggHeight * eggHeight; var eggWidth2 = eggWidth * eggWidth; var normMap = []; var getNormalMap = function() { // Cache noise var x, y, xrange, xp, yp, zp, d0, dx, dy, dz, xf, n, m; var noiseScale = 1; var t = 2.5; var bumpAmount = 80; noiseDetail(4, 0.5); var getShiftedNoise = function(x, y, z) { m = 1 - noise(x * t, y * t, z * t) * 0.5; // Push noise the extremes with S-curve m = m (3 - 2 * m); m = m (3 - 2 * m); //m = m (3 - 2 * m); //m = m (3 - 2 * m); // Smooth surface m = m (6 - 5 * m) * 0.6; //m = m (6 - 5 * m) * 0.8; return 1 - m; }; for (y = 1 - eggHeight; y < eggHeight; y++) { yp = y / eggHeight; // Length of along x we go xf = (1 + 0.4 * yp); xrange = floor(sqrt(xf * eggWidth2 * (1 - y * y / eggHeight2))); for (x = -xrange; x <= xrange; x++) { yp = y / eggHeight; xp = x / eggWidth; zp = sqrt(1 - xp * xp / xf - yp * yp); // Get noise for colours n = noise(xp, yp, zp); n = n (3 - 2 * n); // Find bumped normals d0 = getShiftedNoise(xp, yp, zp); dx = getShiftedNoise(xp + 0.001, yp, zp); dy = getShiftedNoise(xp, yp + 0.001, zp); dz = getShiftedNoise(xp, yp, zp + 0.001); // Shift each position xp -= (d0 - dx) * bumpAmount; yp -= (d0 - dy) * bumpAmount; zp -= (d0 - dz) * bumpAmount; // Normalise bumpAmount = (255 - d0 * 85) / sqrt(xp * xp + yp * yp + zp * zp); normMap.push([xp * bumpAmount, yp * bumpAmount, zp * bumpAmount, n]); } } }; getNormalMap(); draw = function() { background(0); // Calculate normalised light vector var lightXNorm = mouseX - eggX; var lightYNorm = mouseY - eggY; var lightDist = sqrt(lightXNorm * lightXNorm + lightYNorm * lightYNorm + lightZ2); lightXNorm /= lightDist; lightYNorm /= lightDist; var lightZNorm = lightZ / lightDist; loadPixels(); var p = this.imageData.data; var ms = millis(); var light, drawY, pixelIndex; var x, y, dx, xp, yp, zp, xf, norm; var count = 0; for (y = 1 - eggHeight; y < eggHeight; y++) { yp = y / eggHeight; // Length of along x we go xf = (1 + 0.4 * yp); dx = floor(sqrt(xf * eggWidth2 * (1 - y * y / eggHeight2))); // Where to draw the shape drawY = eggX + (y + eggY) * 400; for (x = -dx; x <= dx; x++) { // Dot product of light and position on sphere // Normal of sphere = [xp, yp, zp] norm = normMap[count++]; light = norm[0] * lightXNorm + norm[1] * lightYNorm + norm[2] * lightZNorm; light = (100 + light * 0.9); pixelIndex = x + drawY << 2; p[pixelIndex] = light * norm[3]; p[pixelIndex + 1] = light * norm[3]; p[pixelIndex + 2] = light * 0.8; } } ms = millis() - ms; updatePixels(); // Test speed fill(200); text(ms, 370, 390); //text(d, 370, 370); };
Folds
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIXCxIKU2NyYXRjaHBhZBiAgOix0_rlCgw
Votes	235
Spin-Offs	23
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	{"id":"5559514153222144","title":"Shaded sphere","deleted":"false","official":"false"}
Hidden From Hotlist	false
Restricted Posting	false
By Child	false
Author Nick	Peter Collingridge
Author Name	peterwcollingridge
Author ID	kaid_1128810778687926889052316
Author Profile Access	COACH

Archive Data

Added	10 months ago, 1739453265092
Updated	10 months ago, 1739453271044
Source Deleted	unknown