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This is a problem on GeoGebra 3D appli on iPhone and Web application.
I want to show the section of surface with a slider.
ex.
f(x, y)=x^2+y^2
b=slider(-2, 2)
y=b
Curve(t, b, f(t, b), t, -2, 2)
But, I can not refer the value of slider b for constructing the space curve.
The same question 
eq1: IntersectPath(p, a) in last command being p the name of plane y=b
be careful y=b is a plane not a line. you must type y=b when the focus is on graphics3D doing click on it
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