[Papervision3D] MeshBatch (sorting multiple meshes by face)

[Simon Oliver]

Some of the scenes I've been playing around with work a bit better when all the faces for some meshes are combined and then z-sorted all in one batch (rather than z-sorting the average vertex pos per object) if their shape is a bit peculiar (large objects such as floors, walls, boxes etc when compared with smaller objects inside them perhaps). Was thinking a MeshBatch class might be useful where you can combine multiple Meshes into a single entity to allow all faces to be sorted together. The class below does this, and you can use it as you would add to a scene, ie:

        _meshBatch=new MeshBatch();

        blocks= new Ase( brickMaterial, "blocks_01.ase" ,1);;
        room= new Ase( material, "room_01.ase" ,1);;
        floor= new Ase( floorMaterial, "floor_01.ase" ,1);;
       
        _meshBatch.push(blocks);
        _meshBatch.push(floor);
        _meshBatch.push(room);

        scene.push(_meshBatch);

Hope its of use :)

Also, the ASE issue with the Maya exporter still seems to be there (the use of \r\n rather than just \n). Reckon we could switch to just \n ? ta!



package org.papervision3d.objects {
    
    import org.papervision3d.objects.Mesh;
    import org.papervision3d.core.proto.DisplayObject3D;
    import org.papervision3d.cameras.Camera3D;
    import org.papervision3d.core.proto.CameraObject3D;
    import org.papervision3d.scenes.Scene3D;
    import org.papervision3d.core.proto.SceneObject3D;
    import org.papervision3d.core.geom.Face3D;

    import flash.display.Sprite
   
    public class MeshBatch extends DisplayObject3D
    {
        
        public var meshes      :Array;
        public var faces      :Array;
        public var showFaces  :Boolean;
        public var sortFaces  :Boolean;
        
        public function MeshBatch()
        {
            super();
            this.meshes = new Array();
            this.faces = new Array();
            //showFaces=true;
            sortFaces=true;
        }
        
        public function push( mesh:Mesh ):void
        {
            meshes.push(mesh);
        }
        
        public override function project( camera :CameraObject3D ):void
        {
            var mesh:Mesh;
            
            for (var i:Number=0;mesh=meshes[i];i++)
                mesh.project(camera);
        }
        
        public override function render( scene :SceneObject3D ):void
        {
    
            this.faces = new Array();
            
            var mesh:Mesh;
            for (var i:Number=0;mesh=meshes[i];i++)    
                this.faces=this.faces.concat(mesh.faces);
                
            var faces:Array = this.faces;
            
            if( this.sortFaces )
                faces.sortOn( 'screenZ', Array.DESCENDING | Array.NUMERIC );
            
            var container  :Sprite    = this._container || scene.container;
            var showFaces :Boolean   = this.showFaces;
            var rendered  :Number    = 0;

            var face :Face3D;

            for( var j:int = 0; face = faces[j]; j++ )
            {
                if( face.visible )
                    rendered += face.render( container, showFaces );
            }
            scene.stats.rendered += rendered;            
        }
    }
}




		
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