Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1 | // The ray tracer code in this file is written by Adam Burmister. It |
| 2 | // is available in its original form from: |
| 3 | // |
| 4 | // http://labs.flog.nz.co/raytracer/ |
| 5 | // |
| 6 | // It has been modified slightly by Google to work as a standalone |
| 7 | // benchmark, but the all the computational code remains |
| 8 | // untouched. This file also contains a copy of parts of the Prototype |
| 9 | // JavaScript framework which is used by the ray tracer. |
| 10 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 11 | var RayTrace = new BenchmarkSuite('RayTrace', 739989, [ |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 12 | new Benchmark('RayTrace', renderScene) |
| 13 | ]); |
| 14 | |
| 15 | |
| 16 | // Variable used to hold a number that can be used to verify that |
| 17 | // the scene was ray traced correctly. |
| 18 | var checkNumber; |
| 19 | |
| 20 | |
| 21 | // ------------------------------------------------------------------------ |
| 22 | // ------------------------------------------------------------------------ |
| 23 | |
| 24 | // The following is a copy of parts of the Prototype JavaScript library: |
| 25 | |
| 26 | // Prototype JavaScript framework, version 1.5.0 |
| 27 | // (c) 2005-2007 Sam Stephenson |
| 28 | // |
| 29 | // Prototype is freely distributable under the terms of an MIT-style license. |
| 30 | // For details, see the Prototype web site: http://prototype.conio.net/ |
| 31 | |
| 32 | |
| 33 | var Class = { |
| 34 | create: function() { |
| 35 | return function() { |
| 36 | this.initialize.apply(this, arguments); |
| 37 | } |
| 38 | } |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | Object.extend = function(destination, source) { |
| 43 | for (var property in source) { |
| 44 | destination[property] = source[property]; |
| 45 | } |
| 46 | return destination; |
| 47 | }; |
| 48 | |
| 49 | |
| 50 | // ------------------------------------------------------------------------ |
| 51 | // ------------------------------------------------------------------------ |
| 52 | |
| 53 | // The rest of this file is the actual ray tracer written by Adam |
| 54 | // Burmister. It's a concatenation of the following files: |
| 55 | // |
| 56 | // flog/color.js |
| 57 | // flog/light.js |
| 58 | // flog/vector.js |
| 59 | // flog/ray.js |
| 60 | // flog/scene.js |
| 61 | // flog/material/basematerial.js |
| 62 | // flog/material/solid.js |
| 63 | // flog/material/chessboard.js |
| 64 | // flog/shape/baseshape.js |
| 65 | // flog/shape/sphere.js |
| 66 | // flog/shape/plane.js |
| 67 | // flog/intersectioninfo.js |
| 68 | // flog/camera.js |
| 69 | // flog/background.js |
| 70 | // flog/engine.js |
| 71 | |
| 72 | |
| 73 | /* Fake a Flog.* namespace */ |
| 74 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 75 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 76 | |
| 77 | Flog.RayTracer.Color = Class.create(); |
| 78 | |
| 79 | Flog.RayTracer.Color.prototype = { |
| 80 | red : 0.0, |
| 81 | green : 0.0, |
| 82 | blue : 0.0, |
| 83 | |
| 84 | initialize : function(r, g, b) { |
| 85 | if(!r) r = 0.0; |
| 86 | if(!g) g = 0.0; |
| 87 | if(!b) b = 0.0; |
| 88 | |
| 89 | this.red = r; |
| 90 | this.green = g; |
| 91 | this.blue = b; |
| 92 | }, |
| 93 | |
| 94 | add : function(c1, c2){ |
| 95 | var result = new Flog.RayTracer.Color(0,0,0); |
| 96 | |
| 97 | result.red = c1.red + c2.red; |
| 98 | result.green = c1.green + c2.green; |
| 99 | result.blue = c1.blue + c2.blue; |
| 100 | |
| 101 | return result; |
| 102 | }, |
| 103 | |
| 104 | addScalar: function(c1, s){ |
| 105 | var result = new Flog.RayTracer.Color(0,0,0); |
| 106 | |
| 107 | result.red = c1.red + s; |
| 108 | result.green = c1.green + s; |
| 109 | result.blue = c1.blue + s; |
| 110 | |
| 111 | result.limit(); |
| 112 | |
| 113 | return result; |
| 114 | }, |
| 115 | |
| 116 | subtract: function(c1, c2){ |
| 117 | var result = new Flog.RayTracer.Color(0,0,0); |
| 118 | |
| 119 | result.red = c1.red - c2.red; |
| 120 | result.green = c1.green - c2.green; |
| 121 | result.blue = c1.blue - c2.blue; |
| 122 | |
| 123 | return result; |
| 124 | }, |
| 125 | |
| 126 | multiply : function(c1, c2) { |
| 127 | var result = new Flog.RayTracer.Color(0,0,0); |
| 128 | |
| 129 | result.red = c1.red * c2.red; |
| 130 | result.green = c1.green * c2.green; |
| 131 | result.blue = c1.blue * c2.blue; |
| 132 | |
| 133 | return result; |
| 134 | }, |
| 135 | |
| 136 | multiplyScalar : function(c1, f) { |
| 137 | var result = new Flog.RayTracer.Color(0,0,0); |
| 138 | |
| 139 | result.red = c1.red * f; |
| 140 | result.green = c1.green * f; |
| 141 | result.blue = c1.blue * f; |
| 142 | |
| 143 | return result; |
| 144 | }, |
| 145 | |
| 146 | divideFactor : function(c1, f) { |
| 147 | var result = new Flog.RayTracer.Color(0,0,0); |
| 148 | |
| 149 | result.red = c1.red / f; |
| 150 | result.green = c1.green / f; |
| 151 | result.blue = c1.blue / f; |
| 152 | |
| 153 | return result; |
| 154 | }, |
| 155 | |
| 156 | limit: function(){ |
| 157 | this.red = (this.red > 0.0) ? ( (this.red > 1.0) ? 1.0 : this.red ) : 0.0; |
| 158 | this.green = (this.green > 0.0) ? ( (this.green > 1.0) ? 1.0 : this.green ) : 0.0; |
| 159 | this.blue = (this.blue > 0.0) ? ( (this.blue > 1.0) ? 1.0 : this.blue ) : 0.0; |
| 160 | }, |
| 161 | |
| 162 | distance : function(color) { |
| 163 | var d = Math.abs(this.red - color.red) + Math.abs(this.green - color.green) + Math.abs(this.blue - color.blue); |
| 164 | return d; |
| 165 | }, |
| 166 | |
| 167 | blend: function(c1, c2, w){ |
| 168 | var result = new Flog.RayTracer.Color(0,0,0); |
| 169 | result = Flog.RayTracer.Color.prototype.add( |
| 170 | Flog.RayTracer.Color.prototype.multiplyScalar(c1, 1 - w), |
| 171 | Flog.RayTracer.Color.prototype.multiplyScalar(c2, w) |
| 172 | ); |
| 173 | return result; |
| 174 | }, |
| 175 | |
| 176 | brightness : function() { |
| 177 | var r = Math.floor(this.red*255); |
| 178 | var g = Math.floor(this.green*255); |
| 179 | var b = Math.floor(this.blue*255); |
| 180 | return (r * 77 + g * 150 + b * 29) >> 8; |
| 181 | }, |
| 182 | |
| 183 | toString : function () { |
| 184 | var r = Math.floor(this.red*255); |
| 185 | var g = Math.floor(this.green*255); |
| 186 | var b = Math.floor(this.blue*255); |
| 187 | |
| 188 | return "rgb("+ r +","+ g +","+ b +")"; |
| 189 | } |
| 190 | } |
| 191 | /* Fake a Flog.* namespace */ |
| 192 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 193 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 194 | |
| 195 | Flog.RayTracer.Light = Class.create(); |
| 196 | |
| 197 | Flog.RayTracer.Light.prototype = { |
| 198 | position: null, |
| 199 | color: null, |
| 200 | intensity: 10.0, |
| 201 | |
| 202 | initialize : function(pos, color, intensity) { |
| 203 | this.position = pos; |
| 204 | this.color = color; |
| 205 | this.intensity = (intensity ? intensity : 10.0); |
| 206 | }, |
| 207 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 208 | toString : function () { |
| 209 | return 'Light [' + this.position.x + ',' + this.position.y + ',' + this.position.z + ']'; |
| 210 | } |
| 211 | } |
| 212 | /* Fake a Flog.* namespace */ |
| 213 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 214 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 215 | |
| 216 | Flog.RayTracer.Vector = Class.create(); |
| 217 | |
| 218 | Flog.RayTracer.Vector.prototype = { |
| 219 | x : 0.0, |
| 220 | y : 0.0, |
| 221 | z : 0.0, |
| 222 | |
| 223 | initialize : function(x, y, z) { |
| 224 | this.x = (x ? x : 0); |
| 225 | this.y = (y ? y : 0); |
| 226 | this.z = (z ? z : 0); |
| 227 | }, |
| 228 | |
| 229 | copy: function(vector){ |
| 230 | this.x = vector.x; |
| 231 | this.y = vector.y; |
| 232 | this.z = vector.z; |
| 233 | }, |
| 234 | |
| 235 | normalize : function() { |
| 236 | var m = this.magnitude(); |
| 237 | return new Flog.RayTracer.Vector(this.x / m, this.y / m, this.z / m); |
| 238 | }, |
| 239 | |
| 240 | magnitude : function() { |
| 241 | return Math.sqrt((this.x * this.x) + (this.y * this.y) + (this.z * this.z)); |
| 242 | }, |
| 243 | |
| 244 | cross : function(w) { |
| 245 | return new Flog.RayTracer.Vector( |
| 246 | -this.z * w.y + this.y * w.z, |
| 247 | this.z * w.x - this.x * w.z, |
| 248 | -this.y * w.x + this.x * w.y); |
| 249 | }, |
| 250 | |
| 251 | dot : function(w) { |
| 252 | return this.x * w.x + this.y * w.y + this.z * w.z; |
| 253 | }, |
| 254 | |
| 255 | add : function(v, w) { |
| 256 | return new Flog.RayTracer.Vector(w.x + v.x, w.y + v.y, w.z + v.z); |
| 257 | }, |
| 258 | |
| 259 | subtract : function(v, w) { |
| 260 | if(!w || !v) throw 'Vectors must be defined [' + v + ',' + w + ']'; |
| 261 | return new Flog.RayTracer.Vector(v.x - w.x, v.y - w.y, v.z - w.z); |
| 262 | }, |
| 263 | |
| 264 | multiplyVector : function(v, w) { |
| 265 | return new Flog.RayTracer.Vector(v.x * w.x, v.y * w.y, v.z * w.z); |
| 266 | }, |
| 267 | |
| 268 | multiplyScalar : function(v, w) { |
| 269 | return new Flog.RayTracer.Vector(v.x * w, v.y * w, v.z * w); |
| 270 | }, |
| 271 | |
| 272 | toString : function () { |
| 273 | return 'Vector [' + this.x + ',' + this.y + ',' + this.z + ']'; |
| 274 | } |
| 275 | } |
| 276 | /* Fake a Flog.* namespace */ |
| 277 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 278 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 279 | |
| 280 | Flog.RayTracer.Ray = Class.create(); |
| 281 | |
| 282 | Flog.RayTracer.Ray.prototype = { |
| 283 | position : null, |
| 284 | direction : null, |
| 285 | initialize : function(pos, dir) { |
| 286 | this.position = pos; |
| 287 | this.direction = dir; |
| 288 | }, |
| 289 | |
| 290 | toString : function () { |
| 291 | return 'Ray [' + this.position + ',' + this.direction + ']'; |
| 292 | } |
| 293 | } |
| 294 | /* Fake a Flog.* namespace */ |
| 295 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 296 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 297 | |
| 298 | Flog.RayTracer.Scene = Class.create(); |
| 299 | |
| 300 | Flog.RayTracer.Scene.prototype = { |
| 301 | camera : null, |
| 302 | shapes : [], |
| 303 | lights : [], |
| 304 | background : null, |
| 305 | |
| 306 | initialize : function() { |
| 307 | this.camera = new Flog.RayTracer.Camera( |
| 308 | new Flog.RayTracer.Vector(0,0,-5), |
| 309 | new Flog.RayTracer.Vector(0,0,1), |
| 310 | new Flog.RayTracer.Vector(0,1,0) |
| 311 | ); |
| 312 | this.shapes = new Array(); |
| 313 | this.lights = new Array(); |
| 314 | this.background = new Flog.RayTracer.Background(new Flog.RayTracer.Color(0,0,0.5), 0.2); |
| 315 | } |
| 316 | } |
| 317 | /* Fake a Flog.* namespace */ |
| 318 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 319 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 320 | if(typeof(Flog.RayTracer.Material) == 'undefined') Flog.RayTracer.Material = {}; |
| 321 | |
| 322 | Flog.RayTracer.Material.BaseMaterial = Class.create(); |
| 323 | |
| 324 | Flog.RayTracer.Material.BaseMaterial.prototype = { |
| 325 | |
| 326 | gloss: 2.0, // [0...infinity] 0 = matt |
| 327 | transparency: 0.0, // 0=opaque |
| 328 | reflection: 0.0, // [0...infinity] 0 = no reflection |
| 329 | refraction: 0.50, |
| 330 | hasTexture: false, |
| 331 | |
| 332 | initialize : function() { |
| 333 | |
| 334 | }, |
| 335 | |
| 336 | getColor: function(u, v){ |
| 337 | |
| 338 | }, |
| 339 | |
| 340 | wrapUp: function(t){ |
| 341 | t = t % 2.0; |
| 342 | if(t < -1) t += 2.0; |
| 343 | if(t >= 1) t -= 2.0; |
| 344 | return t; |
| 345 | }, |
| 346 | |
| 347 | toString : function () { |
| 348 | return 'Material [gloss=' + this.gloss + ', transparency=' + this.transparency + ', hasTexture=' + this.hasTexture +']'; |
| 349 | } |
| 350 | } |
| 351 | /* Fake a Flog.* namespace */ |
| 352 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 353 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 354 | |
| 355 | Flog.RayTracer.Material.Solid = Class.create(); |
| 356 | |
| 357 | Flog.RayTracer.Material.Solid.prototype = Object.extend( |
| 358 | new Flog.RayTracer.Material.BaseMaterial(), { |
| 359 | initialize : function(color, reflection, refraction, transparency, gloss) { |
| 360 | this.color = color; |
| 361 | this.reflection = reflection; |
| 362 | this.transparency = transparency; |
| 363 | this.gloss = gloss; |
| 364 | this.hasTexture = false; |
| 365 | }, |
| 366 | |
| 367 | getColor: function(u, v){ |
| 368 | return this.color; |
| 369 | }, |
| 370 | |
| 371 | toString : function () { |
| 372 | return 'SolidMaterial [gloss=' + this.gloss + ', transparency=' + this.transparency + ', hasTexture=' + this.hasTexture +']'; |
| 373 | } |
| 374 | } |
| 375 | ); |
| 376 | /* Fake a Flog.* namespace */ |
| 377 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 378 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 379 | |
| 380 | Flog.RayTracer.Material.Chessboard = Class.create(); |
| 381 | |
| 382 | Flog.RayTracer.Material.Chessboard.prototype = Object.extend( |
| 383 | new Flog.RayTracer.Material.BaseMaterial(), { |
| 384 | colorEven: null, |
| 385 | colorOdd: null, |
| 386 | density: 0.5, |
| 387 | |
| 388 | initialize : function(colorEven, colorOdd, reflection, transparency, gloss, density) { |
| 389 | this.colorEven = colorEven; |
| 390 | this.colorOdd = colorOdd; |
| 391 | this.reflection = reflection; |
| 392 | this.transparency = transparency; |
| 393 | this.gloss = gloss; |
| 394 | this.density = density; |
| 395 | this.hasTexture = true; |
| 396 | }, |
| 397 | |
| 398 | getColor: function(u, v){ |
| 399 | var t = this.wrapUp(u * this.density) * this.wrapUp(v * this.density); |
| 400 | |
| 401 | if(t < 0.0) |
| 402 | return this.colorEven; |
| 403 | else |
| 404 | return this.colorOdd; |
| 405 | }, |
| 406 | |
| 407 | toString : function () { |
| 408 | return 'ChessMaterial [gloss=' + this.gloss + ', transparency=' + this.transparency + ', hasTexture=' + this.hasTexture +']'; |
| 409 | } |
| 410 | } |
| 411 | ); |
| 412 | /* Fake a Flog.* namespace */ |
| 413 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 414 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 415 | if(typeof(Flog.RayTracer.Shape) == 'undefined') Flog.RayTracer.Shape = {}; |
| 416 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 417 | Flog.RayTracer.Shape.Sphere = Class.create(); |
| 418 | |
| 419 | Flog.RayTracer.Shape.Sphere.prototype = { |
| 420 | initialize : function(pos, radius, material) { |
| 421 | this.radius = radius; |
| 422 | this.position = pos; |
| 423 | this.material = material; |
| 424 | }, |
| 425 | |
| 426 | intersect: function(ray){ |
| 427 | var info = new Flog.RayTracer.IntersectionInfo(); |
| 428 | info.shape = this; |
| 429 | |
| 430 | var dst = Flog.RayTracer.Vector.prototype.subtract(ray.position, this.position); |
| 431 | |
| 432 | var B = dst.dot(ray.direction); |
| 433 | var C = dst.dot(dst) - (this.radius * this.radius); |
| 434 | var D = (B * B) - C; |
| 435 | |
| 436 | if(D > 0){ // intersection! |
| 437 | info.isHit = true; |
| 438 | info.distance = (-B) - Math.sqrt(D); |
| 439 | info.position = Flog.RayTracer.Vector.prototype.add( |
| 440 | ray.position, |
| 441 | Flog.RayTracer.Vector.prototype.multiplyScalar( |
| 442 | ray.direction, |
| 443 | info.distance |
| 444 | ) |
| 445 | ); |
| 446 | info.normal = Flog.RayTracer.Vector.prototype.subtract( |
| 447 | info.position, |
| 448 | this.position |
| 449 | ).normalize(); |
| 450 | |
| 451 | info.color = this.material.getColor(0,0); |
| 452 | } else { |
| 453 | info.isHit = false; |
| 454 | } |
| 455 | return info; |
| 456 | }, |
| 457 | |
| 458 | toString : function () { |
| 459 | return 'Sphere [position=' + this.position + ', radius=' + this.radius + ']'; |
| 460 | } |
| 461 | } |
| 462 | /* Fake a Flog.* namespace */ |
| 463 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 464 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 465 | if(typeof(Flog.RayTracer.Shape) == 'undefined') Flog.RayTracer.Shape = {}; |
| 466 | |
| 467 | Flog.RayTracer.Shape.Plane = Class.create(); |
| 468 | |
| 469 | Flog.RayTracer.Shape.Plane.prototype = { |
| 470 | d: 0.0, |
| 471 | |
| 472 | initialize : function(pos, d, material) { |
| 473 | this.position = pos; |
| 474 | this.d = d; |
| 475 | this.material = material; |
| 476 | }, |
| 477 | |
| 478 | intersect: function(ray){ |
| 479 | var info = new Flog.RayTracer.IntersectionInfo(); |
| 480 | |
| 481 | var Vd = this.position.dot(ray.direction); |
| 482 | if(Vd == 0) return info; // no intersection |
| 483 | |
| 484 | var t = -(this.position.dot(ray.position) + this.d) / Vd; |
| 485 | if(t <= 0) return info; |
| 486 | |
| 487 | info.shape = this; |
| 488 | info.isHit = true; |
| 489 | info.position = Flog.RayTracer.Vector.prototype.add( |
| 490 | ray.position, |
| 491 | Flog.RayTracer.Vector.prototype.multiplyScalar( |
| 492 | ray.direction, |
| 493 | t |
| 494 | ) |
| 495 | ); |
| 496 | info.normal = this.position; |
| 497 | info.distance = t; |
| 498 | |
| 499 | if(this.material.hasTexture){ |
| 500 | var vU = new Flog.RayTracer.Vector(this.position.y, this.position.z, -this.position.x); |
| 501 | var vV = vU.cross(this.position); |
| 502 | var u = info.position.dot(vU); |
| 503 | var v = info.position.dot(vV); |
| 504 | info.color = this.material.getColor(u,v); |
| 505 | } else { |
| 506 | info.color = this.material.getColor(0,0); |
| 507 | } |
| 508 | |
| 509 | return info; |
| 510 | }, |
| 511 | |
| 512 | toString : function () { |
| 513 | return 'Plane [' + this.position + ', d=' + this.d + ']'; |
| 514 | } |
| 515 | } |
| 516 | /* Fake a Flog.* namespace */ |
| 517 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 518 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 519 | |
| 520 | Flog.RayTracer.IntersectionInfo = Class.create(); |
| 521 | |
| 522 | Flog.RayTracer.IntersectionInfo.prototype = { |
| 523 | isHit: false, |
| 524 | hitCount: 0, |
| 525 | shape: null, |
| 526 | position: null, |
| 527 | normal: null, |
| 528 | color: null, |
| 529 | distance: null, |
| 530 | |
| 531 | initialize : function() { |
| 532 | this.color = new Flog.RayTracer.Color(0,0,0); |
| 533 | }, |
| 534 | |
| 535 | toString : function () { |
| 536 | return 'Intersection [' + this.position + ']'; |
| 537 | } |
| 538 | } |
| 539 | /* Fake a Flog.* namespace */ |
| 540 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 541 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 542 | |
| 543 | Flog.RayTracer.Camera = Class.create(); |
| 544 | |
| 545 | Flog.RayTracer.Camera.prototype = { |
| 546 | position: null, |
| 547 | lookAt: null, |
| 548 | equator: null, |
| 549 | up: null, |
| 550 | screen: null, |
| 551 | |
| 552 | initialize : function(pos, lookAt, up) { |
| 553 | this.position = pos; |
| 554 | this.lookAt = lookAt; |
| 555 | this.up = up; |
| 556 | this.equator = lookAt.normalize().cross(this.up); |
| 557 | this.screen = Flog.RayTracer.Vector.prototype.add(this.position, this.lookAt); |
| 558 | }, |
| 559 | |
| 560 | getRay: function(vx, vy){ |
| 561 | var pos = Flog.RayTracer.Vector.prototype.subtract( |
| 562 | this.screen, |
| 563 | Flog.RayTracer.Vector.prototype.subtract( |
| 564 | Flog.RayTracer.Vector.prototype.multiplyScalar(this.equator, vx), |
| 565 | Flog.RayTracer.Vector.prototype.multiplyScalar(this.up, vy) |
| 566 | ) |
| 567 | ); |
| 568 | pos.y = pos.y * -1; |
| 569 | var dir = Flog.RayTracer.Vector.prototype.subtract( |
| 570 | pos, |
| 571 | this.position |
| 572 | ); |
| 573 | |
| 574 | var ray = new Flog.RayTracer.Ray(pos, dir.normalize()); |
| 575 | |
| 576 | return ray; |
| 577 | }, |
| 578 | |
| 579 | toString : function () { |
| 580 | return 'Ray []'; |
| 581 | } |
| 582 | } |
| 583 | /* Fake a Flog.* namespace */ |
| 584 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 585 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 586 | |
| 587 | Flog.RayTracer.Background = Class.create(); |
| 588 | |
| 589 | Flog.RayTracer.Background.prototype = { |
| 590 | color : null, |
| 591 | ambience : 0.0, |
| 592 | |
| 593 | initialize : function(color, ambience) { |
| 594 | this.color = color; |
| 595 | this.ambience = ambience; |
| 596 | } |
| 597 | } |
| 598 | /* Fake a Flog.* namespace */ |
| 599 | if(typeof(Flog) == 'undefined') var Flog = {}; |
| 600 | if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {}; |
| 601 | |
| 602 | Flog.RayTracer.Engine = Class.create(); |
| 603 | |
| 604 | Flog.RayTracer.Engine.prototype = { |
| 605 | canvas: null, /* 2d context we can render to */ |
| 606 | |
| 607 | initialize: function(options){ |
| 608 | this.options = Object.extend({ |
| 609 | canvasHeight: 100, |
| 610 | canvasWidth: 100, |
| 611 | pixelWidth: 2, |
| 612 | pixelHeight: 2, |
| 613 | renderDiffuse: false, |
| 614 | renderShadows: false, |
| 615 | renderHighlights: false, |
| 616 | renderReflections: false, |
| 617 | rayDepth: 2 |
| 618 | }, options || {}); |
| 619 | |
| 620 | this.options.canvasHeight /= this.options.pixelHeight; |
| 621 | this.options.canvasWidth /= this.options.pixelWidth; |
| 622 | |
| 623 | /* TODO: dynamically include other scripts */ |
| 624 | }, |
| 625 | |
| 626 | setPixel: function(x, y, color){ |
| 627 | var pxW, pxH; |
| 628 | pxW = this.options.pixelWidth; |
| 629 | pxH = this.options.pixelHeight; |
| 630 | |
| 631 | if (this.canvas) { |
| 632 | this.canvas.fillStyle = color.toString(); |
| 633 | this.canvas.fillRect (x * pxW, y * pxH, pxW, pxH); |
| 634 | } else { |
| 635 | if (x === y) { |
| 636 | checkNumber += color.brightness(); |
| 637 | } |
| 638 | // print(x * pxW, y * pxH, pxW, pxH); |
| 639 | } |
| 640 | }, |
| 641 | |
| 642 | renderScene: function(scene, canvas){ |
| 643 | checkNumber = 0; |
| 644 | /* Get canvas */ |
| 645 | if (canvas) { |
| 646 | this.canvas = canvas.getContext("2d"); |
| 647 | } else { |
| 648 | this.canvas = null; |
| 649 | } |
| 650 | |
| 651 | var canvasHeight = this.options.canvasHeight; |
| 652 | var canvasWidth = this.options.canvasWidth; |
| 653 | |
| 654 | for(var y=0; y < canvasHeight; y++){ |
| 655 | for(var x=0; x < canvasWidth; x++){ |
| 656 | var yp = y * 1.0 / canvasHeight * 2 - 1; |
| 657 | var xp = x * 1.0 / canvasWidth * 2 - 1; |
| 658 | |
| 659 | var ray = scene.camera.getRay(xp, yp); |
| 660 | |
| 661 | var color = this.getPixelColor(ray, scene); |
| 662 | |
| 663 | this.setPixel(x, y, color); |
| 664 | } |
| 665 | } |
| 666 | if (checkNumber !== 2321) { |
| 667 | throw new Error("Scene rendered incorrectly"); |
| 668 | } |
| 669 | }, |
| 670 | |
| 671 | getPixelColor: function(ray, scene){ |
| 672 | var info = this.testIntersection(ray, scene, null); |
| 673 | if(info.isHit){ |
| 674 | var color = this.rayTrace(info, ray, scene, 0); |
| 675 | return color; |
| 676 | } |
| 677 | return scene.background.color; |
| 678 | }, |
| 679 | |
| 680 | testIntersection: function(ray, scene, exclude){ |
| 681 | var hits = 0; |
| 682 | var best = new Flog.RayTracer.IntersectionInfo(); |
| 683 | best.distance = 2000; |
| 684 | |
| 685 | for(var i=0; i<scene.shapes.length; i++){ |
| 686 | var shape = scene.shapes[i]; |
| 687 | |
| 688 | if(shape != exclude){ |
| 689 | var info = shape.intersect(ray); |
| 690 | if(info.isHit && info.distance >= 0 && info.distance < best.distance){ |
| 691 | best = info; |
| 692 | hits++; |
| 693 | } |
| 694 | } |
| 695 | } |
| 696 | best.hitCount = hits; |
| 697 | return best; |
| 698 | }, |
| 699 | |
| 700 | getReflectionRay: function(P,N,V){ |
| 701 | var c1 = -N.dot(V); |
| 702 | var R1 = Flog.RayTracer.Vector.prototype.add( |
| 703 | Flog.RayTracer.Vector.prototype.multiplyScalar(N, 2*c1), |
| 704 | V |
| 705 | ); |
| 706 | return new Flog.RayTracer.Ray(P, R1); |
| 707 | }, |
| 708 | |
| 709 | rayTrace: function(info, ray, scene, depth){ |
| 710 | // Calc ambient |
| 711 | var color = Flog.RayTracer.Color.prototype.multiplyScalar(info.color, scene.background.ambience); |
| 712 | var oldColor = color; |
| 713 | var shininess = Math.pow(10, info.shape.material.gloss + 1); |
| 714 | |
| 715 | for(var i=0; i<scene.lights.length; i++){ |
| 716 | var light = scene.lights[i]; |
| 717 | |
| 718 | // Calc diffuse lighting |
| 719 | var v = Flog.RayTracer.Vector.prototype.subtract( |
| 720 | light.position, |
| 721 | info.position |
| 722 | ).normalize(); |
| 723 | |
| 724 | if(this.options.renderDiffuse){ |
| 725 | var L = v.dot(info.normal); |
| 726 | if(L > 0.0){ |
| 727 | color = Flog.RayTracer.Color.prototype.add( |
| 728 | color, |
| 729 | Flog.RayTracer.Color.prototype.multiply( |
| 730 | info.color, |
| 731 | Flog.RayTracer.Color.prototype.multiplyScalar( |
| 732 | light.color, |
| 733 | L |
| 734 | ) |
| 735 | ) |
| 736 | ); |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | // The greater the depth the more accurate the colours, but |
| 741 | // this is exponentially (!) expensive |
| 742 | if(depth <= this.options.rayDepth){ |
| 743 | // calculate reflection ray |
| 744 | if(this.options.renderReflections && info.shape.material.reflection > 0) |
| 745 | { |
| 746 | var reflectionRay = this.getReflectionRay(info.position, info.normal, ray.direction); |
| 747 | var refl = this.testIntersection(reflectionRay, scene, info.shape); |
| 748 | |
| 749 | if (refl.isHit && refl.distance > 0){ |
| 750 | refl.color = this.rayTrace(refl, reflectionRay, scene, depth + 1); |
| 751 | } else { |
| 752 | refl.color = scene.background.color; |
| 753 | } |
| 754 | |
| 755 | color = Flog.RayTracer.Color.prototype.blend( |
| 756 | color, |
| 757 | refl.color, |
| 758 | info.shape.material.reflection |
| 759 | ); |
| 760 | } |
| 761 | |
| 762 | // Refraction |
| 763 | /* TODO */ |
| 764 | } |
| 765 | |
| 766 | /* Render shadows and highlights */ |
| 767 | |
| 768 | var shadowInfo = new Flog.RayTracer.IntersectionInfo(); |
| 769 | |
| 770 | if(this.options.renderShadows){ |
| 771 | var shadowRay = new Flog.RayTracer.Ray(info.position, v); |
| 772 | |
| 773 | shadowInfo = this.testIntersection(shadowRay, scene, info.shape); |
| 774 | if(shadowInfo.isHit && shadowInfo.shape != info.shape /*&& shadowInfo.shape.type != 'PLANE'*/){ |
| 775 | var vA = Flog.RayTracer.Color.prototype.multiplyScalar(color, 0.5); |
| 776 | var dB = (0.5 * Math.pow(shadowInfo.shape.material.transparency, 0.5)); |
| 777 | color = Flog.RayTracer.Color.prototype.addScalar(vA,dB); |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | // Phong specular highlights |
| 782 | if(this.options.renderHighlights && !shadowInfo.isHit && info.shape.material.gloss > 0){ |
| 783 | var Lv = Flog.RayTracer.Vector.prototype.subtract( |
| 784 | info.shape.position, |
| 785 | light.position |
| 786 | ).normalize(); |
| 787 | |
| 788 | var E = Flog.RayTracer.Vector.prototype.subtract( |
| 789 | scene.camera.position, |
| 790 | info.shape.position |
| 791 | ).normalize(); |
| 792 | |
| 793 | var H = Flog.RayTracer.Vector.prototype.subtract( |
| 794 | E, |
| 795 | Lv |
| 796 | ).normalize(); |
| 797 | |
| 798 | var glossWeight = Math.pow(Math.max(info.normal.dot(H), 0), shininess); |
| 799 | color = Flog.RayTracer.Color.prototype.add( |
| 800 | Flog.RayTracer.Color.prototype.multiplyScalar(light.color, glossWeight), |
| 801 | color |
| 802 | ); |
| 803 | } |
| 804 | } |
| 805 | color.limit(); |
| 806 | return color; |
| 807 | } |
| 808 | }; |
| 809 | |
| 810 | |
| 811 | function renderScene(){ |
| 812 | var scene = new Flog.RayTracer.Scene(); |
| 813 | |
| 814 | scene.camera = new Flog.RayTracer.Camera( |
| 815 | new Flog.RayTracer.Vector(0, 0, -15), |
| 816 | new Flog.RayTracer.Vector(-0.2, 0, 5), |
| 817 | new Flog.RayTracer.Vector(0, 1, 0) |
| 818 | ); |
| 819 | |
| 820 | scene.background = new Flog.RayTracer.Background( |
| 821 | new Flog.RayTracer.Color(0.5, 0.5, 0.5), |
| 822 | 0.4 |
| 823 | ); |
| 824 | |
| 825 | var sphere = new Flog.RayTracer.Shape.Sphere( |
| 826 | new Flog.RayTracer.Vector(-1.5, 1.5, 2), |
| 827 | 1.5, |
| 828 | new Flog.RayTracer.Material.Solid( |
| 829 | new Flog.RayTracer.Color(0,0.5,0.5), |
| 830 | 0.3, |
| 831 | 0.0, |
| 832 | 0.0, |
| 833 | 2.0 |
| 834 | ) |
| 835 | ); |
| 836 | |
| 837 | var sphere1 = new Flog.RayTracer.Shape.Sphere( |
| 838 | new Flog.RayTracer.Vector(1, 0.25, 1), |
| 839 | 0.5, |
| 840 | new Flog.RayTracer.Material.Solid( |
| 841 | new Flog.RayTracer.Color(0.9,0.9,0.9), |
| 842 | 0.1, |
| 843 | 0.0, |
| 844 | 0.0, |
| 845 | 1.5 |
| 846 | ) |
| 847 | ); |
| 848 | |
| 849 | var plane = new Flog.RayTracer.Shape.Plane( |
| 850 | new Flog.RayTracer.Vector(0.1, 0.9, -0.5).normalize(), |
| 851 | 1.2, |
| 852 | new Flog.RayTracer.Material.Chessboard( |
| 853 | new Flog.RayTracer.Color(1,1,1), |
| 854 | new Flog.RayTracer.Color(0,0,0), |
| 855 | 0.2, |
| 856 | 0.0, |
| 857 | 1.0, |
| 858 | 0.7 |
| 859 | ) |
| 860 | ); |
| 861 | |
| 862 | scene.shapes.push(plane); |
| 863 | scene.shapes.push(sphere); |
| 864 | scene.shapes.push(sphere1); |
| 865 | |
| 866 | var light = new Flog.RayTracer.Light( |
| 867 | new Flog.RayTracer.Vector(5, 10, -1), |
| 868 | new Flog.RayTracer.Color(0.8, 0.8, 0.8) |
| 869 | ); |
| 870 | |
| 871 | var light1 = new Flog.RayTracer.Light( |
| 872 | new Flog.RayTracer.Vector(-3, 5, -15), |
| 873 | new Flog.RayTracer.Color(0.8, 0.8, 0.8), |
| 874 | 100 |
| 875 | ); |
| 876 | |
| 877 | scene.lights.push(light); |
| 878 | scene.lights.push(light1); |
| 879 | |
| 880 | var imageWidth = 100; // $F('imageWidth'); |
| 881 | var imageHeight = 100; // $F('imageHeight'); |
| 882 | var pixelSize = "5,5".split(','); // $F('pixelSize').split(','); |
| 883 | var renderDiffuse = true; // $F('renderDiffuse'); |
| 884 | var renderShadows = true; // $F('renderShadows'); |
| 885 | var renderHighlights = true; // $F('renderHighlights'); |
| 886 | var renderReflections = true; // $F('renderReflections'); |
| 887 | var rayDepth = 2;//$F('rayDepth'); |
| 888 | |
| 889 | var raytracer = new Flog.RayTracer.Engine( |
| 890 | { |
| 891 | canvasWidth: imageWidth, |
| 892 | canvasHeight: imageHeight, |
| 893 | pixelWidth: pixelSize[0], |
| 894 | pixelHeight: pixelSize[1], |
| 895 | "renderDiffuse": renderDiffuse, |
| 896 | "renderHighlights": renderHighlights, |
| 897 | "renderShadows": renderShadows, |
| 898 | "renderReflections": renderReflections, |
| 899 | "rayDepth": rayDepth |
| 900 | } |
| 901 | ); |
| 902 | |
| 903 | raytracer.renderScene(scene, null, 0); |
| 904 | } |