'**Arguments:**
data            Volume data to be rendered. *Must* be 3D numpy array (x, y, RGBA) with dtype=ubyte.
(See functions.makeRGBA)
smooth          (bool) If True, the volume slices are rendered with linear interpolation'

def __init__(self, data, smooth=False, glOptions='translucent'):

    self.smooth = smooth
    self._needUpdate = False
    GLGraphicsItem.__init__(self)
    self.setData(data)
    self.setGLOptions(glOptions)
