Question: Difference in 3D plotting between Maple and Mathematica

I plotted the following tangent function with Maple and Mathematica for t=4. 

restart:
func:=unapply(-tan((-4*t+x+2*y)/(2*sqrt(15)))/(2*sqrt(2)),x,y,t);
plot3d(func(x,y,4),x=-15..15,y=-15..15);

Maple 3D plot:

Mathematica 3D plot:

 

I think that Maple shows the asymptotes. Is it possible to close the asymptotes?

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