[Maxima] I'm sorry, I have something wrong with maxima draw3d

[刘磊]

I'm sorry, I have something wrong with maxima (wx)draw3d, would you help me?
 
I've something wrong with maxima draw3d function. Please check the attachment. The function plot3d can run correctly, but draw3d runs wrong, why?
 
                                                                                                                    LiuLei
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