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@attention: There is a difference between performing rotation first 
@attention: There is a difference between performing rotation first 
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followed by translation, and performing translation first followed 
followed by translation, and performing translation first followed 
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by rotation. 
by rotation. 
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@attention: VTK's coordinate system and translation is NOT 100% accurate. 
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Consequently, performing maximum rotation and translation can potentially 
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yield incorrect results. For instance, rotating a XY plane along the xaxis 
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90 degrees may NOT produce any results (as it is possible that the XY 
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plane has just fallen outside the visible range). However, rotating the 
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XY plane 89.9 degrees instead should produce the correct resutls. 
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""" 
""" 
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def __init__(self): 
def __init__(self): 