Doodle3D-Slicer/three.js-master/examples/js/wip/benchmark/PlaneGeometry2b.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.PlaneGeometry2b = function ( width, height, widthSegments, heightSegments ) {
THREE.Geometry2.call( this, ( widthSegments * heightSegments ) * 2 * 3 );
var vertices = this.vertices;
var normals = this.normals;
var uvs = this.uvs;
this.width = width;
this.height = height;
this.widthSegments = widthSegments || 1;
this.heightSegments = heightSegments || 1;
var widthHalf = width / 2;
var heightHalf = height / 2;
var gridX = this.widthSegments;
var gridY = this.heightSegments;
var segmentWidth = this.width / gridX;
var segmentHeight = this.height / gridY;
var index = 0;
for ( var iy = 0; iy < gridY; iy ++ ) {
var y1 = iy * segmentHeight - heightHalf;
var y2 = ( iy + 1 ) * segmentHeight - heightHalf;
for ( var ix = 0; ix < gridX; ix ++ ) {
var x1 = ix * segmentWidth - widthHalf;
var x2 = ( ix + 1 ) * segmentWidth - widthHalf;
this.vertices.setXY( index + 0, x1, y1 );
this.vertices.setXY( index + 1, x2, y1 );
this.vertices.setXY( index + 2, x1, y2 );
this.vertices.setXY( index + 3, x2, y1 );
this.vertices.setXY( index + 4, x2, y2 );
this.vertices.setXY( index + 5, x1, y2 );
this.normals.setZ( index + 0, 1 );
this.normals.setZ( index + 1, 1 );
this.normals.setZ( index + 2, 1 );
this.normals.setZ( index + 3, 1 );
this.normals.setZ( index + 4, 1 );
this.normals.setZ( index + 5, 1 );
index += 6;
}
}
};
THREE.PlaneGeometry2b.prototype = Object.create( THREE.Geometry2.prototype );
THREE.PlaneGeometry2b.prototype.constructor = THREE.PlaneGeometry2b;