Viewing Program

Program Data

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

Title	Ray Tracer
ID	938492898
Created	12 years ago, 1352757140923
Updated	12 years ago, 1344014106610
Code	var Vector = function(elements) { this.elements = elements; }; Vector.prototype = { length: function() { var squares = 0; for (var x in this.elements) { squares += xx; } return sqrt(squares); }, dot: function(vector) { var v = vector.elements \|\| vector, ret, len = min(this.elements.length, v.length); for (var i = 0; i < len; i++){ ret += this.elements[i] v[i]; } return this; }, cross: function(vector) { var v1 = vector.elements \|\| vector, v2 = this.elements; if (v1.length !== 3 \|\| v2.length !== 3) { return null; } return new Vector([ (v1[1] * v2[2]) - (v1[2] * v2[1]), (v1[2] * v2[0]) - (v1[0] * v2[2]), (v1[0] * v2[1]) - (v1[1] * v2[0]) ]); }, add: function(vector) { var v = vector.elements \|\| vector, len = min(this.elements, v); for (var i = 0; i < len; i++) { this.elements[i] += v[i]; } return this; }, sub: function(vector) { var v = vector.elements \|\| vector, len = min(this.elements, v); for (var i = 0; i < len; i++) { this.elements[i] += v[i]; } return this; }, mult: function(x) { return this.map(function(y) { return xy; }); }, div: function(x) { return this.mult(1/x); }, map: function(f) { for (var i = 0; i < this.elements.length; i++) { this.elements[i] = f(this.elements[i]); } return this; }, normalize: function() { return this.div(this.length()); } }; var Canvas = function(width, height, radius) { this.width = width; this.height = height; this.buffer = []; // wtf for (var i = 0 ; i < width; i++) { this.buffer.push([]); for (var j = 0; j < height; j++) { this.buffer[i].push({ samples: 0, color: new Vector([1,0,0]) }); } } }; Canvas.prototype = { record: function(x, y, color) { var oldColor = this.buffer[x][y].color, oldSamples = this.buffer[x][y].samples, newColor = color;/oldColor.mult(oldSamples) .add(newColor) .div(oldSamples +1);/ this.buffer[x][y] = { samples: oldSamples + 1, color: newColor }; }, draw: function() { for (var i = 0; i < this.width; i++) { for (var j = 0; j < this.height; j++) { fill(this.buffer[i][j][0], this.buffer[i][j][1], this.buffer[i][j][2] ); var diam = this.radius 2; ellipse(i * diam, j * diam, diam, diam); } } } }; var Sphere = function(center, radius, color) { return function(origin, direction) { var op = center.sub(direction), eps = 1e-4, b = op.dot(direction), det = (b * b) - (op.dot(op)) + (radius * radius), sqrtdet = sqrt(det), t1 = b - sqrtdet, t2 = b + sqrtdet, dist; if (det < 0) { return null; } else if (t1 > eps){ dist = t1; } else if (t2 > eps) { dist = t2; } else { return null; } return { dist: dist, color: color }; }; }; var Tracer = function(scene, canvas, origin, direction) { this.scene = scene; this.canvas = canvas; this.origin = origin; this.direction = direction; }; Tracer.prototype = { traceRay: function(x, y, ray) { var closest = 1e10, hitColor = Vector([0, 0, 0]); for (var i = 0; i < this.scene.length; i++) { var intersection = this.scene[i](ray.origin, ray.direction); if (intersection && intersection.dist < closest) { closest = intersection.dist; hitColor = intersection.color; } } this.canvas.record(x, y, hitColor); }, tracePixel: function(x, y) { var ray = { origin: this.origin, direction: this.direction.add([0.1, 0, 0]).add([0, 0.1, 0]).normalize() }; this.traceRay(x, y, ray); }, traceCanvas: function() { for (var x = 0; x < this.canvas.width; x++){ for (var y = 0; y < this.canvas.height; y++) { this.tracePixel(x, y); } } } }; var dotRadius = 4, width = 60, height = 60, canvas = new Canvas(width, height, dotRadius), scene = [ Sphere(new Vector([27,16.5,47]), 16.5, new Vector([0.5,0.5,0.5])), Sphere(new Vector([73,16.5,78]), 16.5, new Vector([0.5,0.5,0.5])), Sphere(new Vector([50,681.6-0.27,81.6]), 600, new Vector([255,255,255])) ], tracer = new Tracer(scene, canvas, new Vector([50,52,295.6]), new Vector([0,-0.042612,-1]).normalize()); tracer.traceCanvas(); tracer.canvas.draw();
Folds
Fork	false
Key	ag5zfmtoYW4tYWNhZGVteXIUCxIKU2NyYXRjaHBhZBjih8G_Aww
Votes	1
Spin-Offs	1
Type	PJS
Width	400
Height	400
User Flagged	false
Origin Scratchpad	null
Hidden From Hotlist	false
Restricted Posting	true
By Child	false
Author Nick	Joel Burget
Author Name	joelburget
Author ID	kaid_956098430296535181795345
Author Profile Access	COACH

Archive Data

Added	7 months ago, 1716389943259
Updated	7 months ago, 1716389943259
Source Deleted	unknown