Away3d 4.0 beta Planeの頂点をランダムに移動し、地面ぽくする ref: http://qiita.com/items/2894

RandomMoveVertex.as

/**
 * copyright (c) 2012 www.romatica.com
 * @auther itoz
 */
package
{
    import away3d.containers.View3D;
    import away3d.core.base.SubGeometry;
    import away3d.debug.AwayStats;
    import away3d.entities.Mesh;
    import away3d.materials.ColorMaterial;
    import away3d.primitives.PlaneGeometry;
    import away3d.primitives.PrimitiveBase;

    import flash.events.Event;
    import flash.geom.Vector3D;
    import flash.utils.getTimer;

    [SWF(backgroundColor="#FFFFFF", frameRate="60", width="800", height="600")]
    /**
     * Planeの頂点をランダムに移動し、地面ぽくする
     * 動作サンプル
     * @see http://dl.dropbox.com/u/958512/sample/away3d4/randomMoveVertex/index.html
     */
    public class RandomMoveVertex extends View3D
    {
        private static const ZERO : Vector3D = new Vector3D(0, 0, 0);
        private var _planeMat : ColorMaterial;
        private var _planeGeo : PrimitiveBase;
        private var _plane : Mesh;

        public function RandomMoveVertex()
        {
            antiAlias = 0;
            backgroundColor = 0xa1c3c0;

            // ----------------------------------
            // プレーン
            // ----------------------------------
            _planeMat = new ColorMaterial(0x567524, 0.5);
            _planeGeo = new PlaneGeometry(1024, 1024, 32, 32);
            _plane = new Mesh(_planeGeo, _planeMat);
            scene.addChild(_plane);

            // ----------------------------------
            // 頂点をランダムに移動
            // ----------------------------------
            var subgeos : Vector.<SubGeometry> = _plane.geometry.subGeometries ;
            var  len : int = subgeos.length;
            for (var j : int = 0; j < len; j++) {
                var geo : SubGeometry = subgeos[j] as SubGeometry;
                var vlen : int = geo.vertexData.length;
                for (var k : int = 0; k < vlen; k ++) {
                    geo.vertexData[k] += Math.random() * 50 - 25;
                }
            }

            camera.y = 500;
            addEventListener(Event.ENTER_FRAME, update);
            addChild(new AwayStats());
        }

        private function update(event : Event) : void
        {
            camera.x = Math.sin(getTimer()/1000) *1000;
            camera.z = Math.cos(getTimer()/1000) *1000;
            camera.lookAt(ZERO);
            render();
        }
    }
}