VertexBuffer newPosVb = new VertexBuffer(Type.Position);
newPosVb.setupData(positions.getUsage(),
positions.getNumComponents(),
posFmt,
newBuf);
mesh.clearBuffer(Type.Position);
mesh.setBuffer(newPosVb);
}
// normals, automatically convert to signed byte
fb = (FloatBuffer) normals.getData();