SHARE
TWEET

Untitled

a guest Oct 22nd, 2017 65 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. //Classe MyTriangle que cria primitivas do tipo triangle
  2. function MyTriangle(scene, values) {
  3.    
  4.     CGFobject.call(this, scene);
  5.  
  6.     //p1, p2 e p3 são os pontos que simbolizam cada vértice do triangulo
  7.     var p1 = [values['x1'], values['y1'], values['z1']];
  8.     var p2 = [values['x2'], values['y2'], values['z2']];
  9.     var p3 = [values['x3'], values['y3'], values['z3']];
  10.    
  11.     this.indices = [0, 1, 2];
  12.     this.vertices = [].concat.apply([], [p1, p2, p3]);
  13.  
  14.     this.a = Math.sqrt((p3[0] - p2[0]) * (p3[0] - p2[0]) +
  15.                        (p3[1] - p2[1]) * (p3[1] - p2[1]) +
  16.                        (p3[2] - p2[2]) * (p3[2] - p2[2]));
  17.  
  18.     this.b = Math.sqrt((p1[0] - p3[0]) * (p1[0] - p3[0]) +
  19.                        (p1[1] - p3[1]) * (p1[1] - p3[1]) +
  20.                        (p1[2] - p3[2]) * (p1[2] - p3[2]));
  21.  
  22.     this.c = Math.sqrt((p2[0] - p1[0]) * (p2[0] - p1[0]) +
  23.                        (p2[1] - p1[1]) * (p2[1] - p1[1]) +
  24.                        (p2[2] - p1[2]) * (p2[2] - p1[2]));
  25.  
  26.    
  27.  
  28.  
  29.     var diffBA = vec3.create(); //cria array de tres elementos
  30.     var diffCA = vec3.create();
  31.     var normal = vec3.create();
  32.  
  33.     vec3.subtract(diffBA, p2, p1);
  34.     vec3.subtract(diffCA, p3, p1);
  35.     vec3.cross(normal, diffBA, diffCA); // produto vetorial, retorna array []
  36.     vec3.normalize(normal, normal);
  37.  
  38.    
  39.     this.normals = [
  40.         normal[0], normal[1], normal[2],
  41.         normal[0], normal[1], normal[2],
  42.         normal[0], normal[1], normal[2]
  43.     ];
  44.  
  45.  
  46.     this.beta = Math.acos((this.a * this.a - this.b * this.b + this.c * this.c) / (2 * this.a * this.c));
  47.     this.primitiveType = this.scene.gl.TRIANGLES;
  48.     this.initGLBuffers();
  49.  };
  50.  
  51. MyTriangle.prototype = Object.create(CGFobject.prototype);
  52. MyTriangle.prototype.constructor = MyTriangle;
  53.  
  54. //Função que atualiza as coordenadas de textura com base nos amplification factors
  55. MyTriangle.prototype.updateTexCoords = function (s, t) {
  56.  
  57.     this.texCoords = [
  58.         0.0, 0.0,
  59.         this.c / s, 0.0,
  60.         (this.c - this.a * Math.cos(this.beta)) / s, -(this.a * Math.sin(this.beta)) / t,
  61.     ];
  62.  
  63.     this.updateTexCoordsGLBuffers();
  64. }
RAW Paste Data
Top