If I plot

var('x y z')
A=implicit_plot3d(x+y+z==1,(x,-3,3),(y,-3,3),(z,-3,3))
B=implicit_plot3d(x+y+z==0,(x,-3,3),(y,-3,3),(z,-3,3),color='red')
A+B

You get what you expect.  However, if I plot

var('x y z')
A=implicit_plot3d(x+y+z==1,(x,-3,3),(y,-3,3),(z,-3,3))
B=implicit_plot3d(x+y+z==0,(x,-3,3),(y,-3,3),(z,-3,3),color='red')
C=plot3d(x^2+y^2,(x,-3,3),(y,-3,3),color='green')
A+B+C

the plots for the two planes A and B are cropped.  What's going on here? 
 (Hopefully, I'm not being silly.)

Dana

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