http://away3d.com/forum/viewthread/476/

このフォーラムで上がってる方法で　override してみたらさっくり動いたのでメモ。
謎のincludeは無視して下さい。

AmCubeGeometry.as

#include <cpp/AmDevelop.h>

package am.graphics
{
    import away3d.primitives.*;
    import away3d.core.base.*;

public class AmCubeGeometry extends CubeGeometry
{

    public function AmCubeGeometry(width:Number, height:Number, depth:Number, segmentsW:uint, segmentsH:uint, segmentsD:uint, tile6:Boolean = true):void {
    super(width, height, depth, segmentsW, segmentsH, segmentsD, tile6);    
    }

    override protected function buildUVs(target : SubGeometry) : void
    {
    var uvData : Vector.<Number>;
    var i : uint, j : uint, uidx  :  uint; // indices
    var hw : Number, hh : Number, hd : Number; // halves
    var dw : Number, dh : Number, dd : Number; // deltas

    var u_tile_dim : Number, v_tile_dim : Number;
    var u_tile_step : Number, v_tile_step : Number;
    var outer_uv : Number;

    var numUvs : uint = ((segmentsW + 1) * (segmentsH + 1) +
                 (segmentsW + 1) * (segmentsD + 1) +
                 (segmentsH + 1) * (segmentsD + 1)) * 4;

    if (target.UVData && numUvs == target.UVData.length)
        uvData = target.UVData;
    else
        uvData = new Vector.<Number>(numUvs, true);


    // half cube dimensions
    hw = width/2;
    hh = height/2;
    hd = height/2;

    // Segment dimensions
    dw = width/segmentsW;
    dh = height/segmentsH;
    dd = depth/segmentsD;

    if (tile6) {
        u_tile_dim = u_tile_step = 1/3;
        v_tile_dim = v_tile_step = 1/2;
    }
    else {
        u_tile_dim = v_tile_dim = 1;
        u_tile_step = v_tile_step = 0;
    }

    for (i = 0; i <= segmentsW; i++) {
        outer_uv = u_tile_dim * (i/segmentsW);

        for (j = 0; j <= segmentsH; j++) {
        uvData[uidx++] = outer_uv;
        uvData[uidx++] = 1-v_tile_dim * (j/segmentsH);
        uvData[uidx++] = 1-outer_uv;
        uvData[uidx++] = 1-(v_tile_step + v_tile_dim * (j/segmentsH));
        }
    }

    for (i = 0; i <= segmentsW; i++) {
        outer_uv = u_tile_step + u_tile_dim * (i/segmentsW);

        for (j = 0; j <= segmentsD; j++) {
        uvData[uidx++] = outer_uv;
        uvData[uidx++] = 1-v_tile_dim * (j/segmentsD);
        uvData[uidx++] = 1-outer_uv;
        uvData[uidx++] = 1-(v_tile_step + v_tile_dim * (j/segmentsD));
        }
    }

    for (i = 0; i <= segmentsH; i++) {
        outer_uv = v_tile_step + v_tile_dim * (i/segmentsW);

        for (j = 0; j <= segmentsD; j++) {
        uvData[uidx++] = (u_tile_dim * ((segmentsD-j)/segmentsD));
        uvData[uidx++] = 1-outer_uv;
        uvData[uidx++] = 1-(u_tile_dim * ((segmentsD-j)/segmentsD));
        uvData[uidx++] = v_tile_step + v_tile_dim * ((segmentsW-i)/segmentsW);
        }
    }

    target.updateUVData(uvData);
    }

}
}

/*
 * Local variables:
 * compile-command: "make --directory=../../ all"
 * End:
 */

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