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Using Plot3D, I tried to plot $x^3 + y^3+3xy=z$

 Plot3D[x^3 + y^3 + 3 x y, {x, -5, 5}, {y, -5, 5}, PlotRange -> {-10, 20}, 
    PlotStyle -> Directive[Yellow, Specularity[White, 20], Opacity[0.8]]]

Now for some reason Mathematica generates this awkward blue plane out of nowhere and I cannot find a way to remove it since I do not even know what it is

enter image description here

I am on Mathematica 8.0.4

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as far as i'm aware that's where the function is being clipped by the containing plot range. change plot range with PlotRange and change clipping style with ClippingStyle –  Thomas Jebb Sturges Apr 2 '13 at 21:58
    
Add this option ClippingStyle -> None. –  Artes Apr 2 '13 at 22:02
    
Ahhhhg, just saw the comments. Happy to withdraw my answer if one of you wants to supplant it. –  Jagra Apr 2 '13 at 22:07
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marked as duplicate by rm -rf Apr 2 '13 at 22:50

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1 Answer

up vote 3 down vote accepted
Plot3D[x^3 + y^3 + 3 x y, {x, -5, 5}, {y, -5, 5}, 
 PlotRange -> {-10, 20}, 
 PlotStyle -> Directive[Yellow, Specularity[White, 20], Opacity[0.8]],
  ClippingStyle -> None]

enter image description here

ClippingStyle -> None does the trick

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