extlib/thingiview.js/plane.js

   1 /**
   2  * @author mr.doob / http://mrdoob.com/
   3  * based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Plane.as
   4  */
   5
   6 var Plane = function ( width, height, segments_width, segments_height ) {
   7
   8         THREE.Geometry.call( this );
   9
  10         var ix, iy,
  11         width_half = width / 2,
  12         height_half = height / 2,
  13         gridX = segments_width || 1,
  14         gridY = segments_height || 1,
  15         gridX1 = gridX + 1,
  16         gridY1 = gridY + 1,
  17         segment_width = width / gridX,
  18         segment_height = height / gridY;
  19
  20
  21         for( iy = 0; iy < gridY1; iy++ ) {
  22
  23                 for( ix = 0; ix < gridX1; ix++ ) {
  24
  25                         var x = ix * segment_width - width_half;
  26                         var y = iy * segment_height - height_half;
  27
  28                         this.vertices.push( new THREE.Vertex( new THREE.Vector3( x, - y, 0 ) ) );
  29
  30                 }
  31
  32         }
  33
  34         for( iy = 0; iy < gridY; iy++ ) {
  35
  36                 for( ix = 0; ix < gridX; ix++ ) {
  37
  38                         var a = ix + gridX1 * iy;
  39                         var b = ix + gridX1 * ( iy + 1 );
  40                         var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
  41                         var d = ( ix + 1 ) + gridX1 * iy;
  42
  43                         this.faces.push( new THREE.Face4( a, b, c, d ) );
  44                         this.uvs.push( [
  45                                                 new THREE.UV( ix / gridX, iy / gridY ),
  46                                                 new THREE.UV( ix / gridX, ( iy + 1 ) / gridY ),
  47                                                 new THREE.UV( ( ix + 1 ) / gridX, ( iy + 1 ) / gridY ),
  48                                                 new THREE.UV( ( ix + 1 ) / gridX, iy / gridY )
  49                                         ] );
  50
  51                 }
  52
  53         }
  54
  55         this.computeCentroids();
  56         this.computeFaceNormals();
  57         this.sortFacesByMaterial();
  58
  59 };
  60
  61 Plane.prototype = new THREE.Geometry();
  62 Plane.prototype.constructor = Plane;