away3d.materials.passes.MaterialPassBase
context.drawTriangles(renderable.getIndexBuffer(stage3DProxy), 0, renderable.numTriangles);
ok
context.drawTriangles(renderable.getIndexBuffer(stage3DProxy), 0, 300);
context.drawTriangles(renderable.getIndexBuffer(stage3DProxy),300, renderable.numTriangles-300);
err
why ?????