verticesCubo

var alto = 1.5;
var ancho = 0.8;
var p = 1.0;

  var vertices = [
    // Front face
    -1.0*p*ancho, -1.0*alto,  1.0*p*ancho, //p1
     1.0*p*ancho, -1.0*alto,  1.0*p*ancho, //p2
     1.0*p*ancho,  1.0*p,  1.0*p*ancho, //p3
    -1.0*p*ancho,  1.0*p,  1.0*p*ancho, //p4

    // Back face
    -1.0*p*ancho, -1.0*alto, -1.0*p*ancho, //p1'
    -1.0*p*ancho,  1.0*p, -1.0*p*ancho, //p2'
     1.0*p*ancho,  1.0*p, -1.0*p*ancho,//p3'
     1.0*p*ancho, -1.0*alto, -1.0*p*ancho, //p4'

    // Top face
    -1.0*p*ancho,  1.0*p, -1.0*p*ancho,//p2'
    -1.0*p*ancho,  1.0*p,  1.0*p*ancho,//p4
     1.0*p*ancho,  1.0*p,  1.0*p*ancho,//p3
     1.0*p*ancho,  1.0*p, -1.0*p*ancho,//p3'

    // Bottom face
    -1.0*p*ancho, -1.0*alto, -1.0*p*ancho,//p1'
     1.0*p*ancho, -1.0*alto, -1.0*p*ancho,//p4'
     1.0*p*ancho, -1.0*alto,  1.0*p*ancho,//p2
    -1.0*p*ancho, -1.0*alto,  1.0*p*ancho,//p1

    // Right face
     1.0*p*ancho, -1.0*alto, -1.0*p*ancho, //p4'
     1.0*p*ancho,  1.0*p, -1.0*p*ancho, //p3
     1.0*p*ancho,  1.0*p,  1.0*p*ancho, //p3'
     1.0*p*ancho, -1.0*alto,  1.0*p*ancho, //p2

    // Left face
    -1.0*p*ancho, -1.0*alto, -1.0*p*ancho, //p1'
    -1.0*p*ancho, -1.0*alto,  1.0*p*ancho, //p1
    -1.0*p*ancho,  1.0*p,  1.0*p*ancho, //p4
    -1.0*p*ancho,  1.0*p, -1.0*p*ancho //p2
  ];