9ballsyndrome Alternativa3D 8.8.0 Planeプリミティブ

Alternativa3D 8.8.0 Planeプリミティブ

フォーラムのこの記事にPlaneのプリミティブオブジェクトのコードがあったので使わせてもらう。

package {
    import alternativa.engine3d.core.Object3D;
    import alternativa.engine3d.core.VertexAttributes;
    import alternativa.engine3d.materials.Material;
    import alternativa.engine3d.objects.Mesh;
    import alternativa.engine3d.resources.Geometry;
 
    /**
     * ...
     * @author
     */
    public class Plane extends Object3D {
        private var _h:uint;
        private var _w:uint;
        private var _material:Material;
        private var _doubleSided:Boolean;
        private var _numTriangles:uint;
 
        public function Plane(h:uint, w:uint, material:Material, doubleSided:Boolean = false){
            this._w = w;
            this._h = h;
            this._material = material;
            this._doubleSided = doubleSided;
            this._numTriangles = (_doubleSided) ? 4 : 2;
            setPlane();
        }
 
        private function setPlane():void {
            var mesh:Mesh = new Mesh()
            var attributes:Array = new Array();
 
            attributes[0] = VertexAttributes.POSITION;
            attributes[1] = VertexAttributes.POSITION;
            attributes[2] = VertexAttributes.POSITION;
            attributes[3] = VertexAttributes.TEXCOORDS[0];
            attributes[4] = VertexAttributes.TEXCOORDS[0];
 
            var geometry:Geometry = new Geometry();
            geometry.addVertexStream(attributes);
            geometry.numVertices = 4;
 
            var vertices:Array = [-(_w / 2), -(_h / 2), 0, -(_w / 2), (_h / 2), 0, (_w / 2), (_h / 2), 0, (_w / 2), -(_h / 2), 0];
            var uvt:Array = [0, 1, 0, 1, 0, 1, 0, 1];
 
            geometry.setAttributeValues(VertexAttributes.POSITION, Vector.<Number>(vertices));
            geometry.setAttributeValues(VertexAttributes.TEXCOORDS[0], Vector.<Number>(uvt));
            var arr_indices:Array = (_doubleSided) ? [0, 1, 2, 0, 2, 3, 0, 2, 1, 0, 3, 2] : [0, 1, 2, 0, 2, 3];
            geometry.indices = Vector.<uint>(arr_indices);
 
            mesh.geometry = geometry;
            mesh.addSurface(_material, 0, _numTriangles);
            mesh.calculateBoundBox();
            addChild(mesh);
        }
 
    }
 
}

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