Doodle3D-Slicer/three.js-master/examples/js/wip/benchmark/IndexedPlaneGeometry5.js

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2015-06-12 15:58:26 +02:00
/**
* @author mrdoob / http://mrdoob.com/
* based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Plane.as
*/
THREE.IndexedPlaneGeometry5 = function ( width, height, widthSegments, heightSegments ) {
this.width = width;
this.height = height;
this.widthSegments = widthSegments || 1;
this.heightSegments = heightSegments || 1;
var width_half = width / 2;
var height_half = height / 2;
var gridX = this.widthSegments;
var gridY = this.heightSegments;
var gridX1 = gridX + 1;
var gridY1 = gridY + 1;
var segment_width = this.width / gridX;
var segment_height = this.height / gridY;
var indices = gridX * gridY * 6;
var vertices = gridX1 * gridY1;
THREE.IndexedGeometry5.call( this, indices, vertices );
var offset = 0;
for ( var iy = 0; iy < gridY1; iy ++ ) {
var y = iy * segment_height - height_half;
for ( var ix = 0; ix < gridX1; ix ++ ) {
var x = ix * segment_width - width_half;
this.vertices[ offset ].x = x;
this.vertices[ offset ].y = - y;
this.normals[ offset ].z = 1;
this.uvs[ offset ].x = ix / gridX;
this.uvs[ offset ].y = iy / gridY;
offset ++;
}
}
var offset = 0;
for ( var iy = 0; iy < gridY; iy ++ ) {
for ( var ix = 0; ix < gridX; ix ++ ) {
var a = ix + gridX1 * iy;
var b = ix + gridX1 * ( iy + 1 );
var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
var d = ( ix + 1 ) + gridX1 * iy;
this.indices[ offset ] = a;
this.indices[ offset + 1 ] = b;
this.indices[ offset + 2 ] = d;
this.indices[ offset + 3 ] = b;
this.indices[ offset + 4 ] = c;
this.indices[ offset + 5 ] = d;
offset += 6;
}
}
};
THREE.IndexedPlaneGeometry5.prototype = Object.create( THREE.IndexedGeometry5.prototype );
THREE.IndexedPlaneGeometry5.prototype.constructor = THREE.IndexedPlaneGeometry5;