Constant 2D functions are not rendered

[jzy3d]

Constant (flat) functions do not render :

Func2D fExp = new Func2D(x->1D);

shows an empty window

Functions with very high minimum or maximum values are not displayed.

Func2D fExp = new Func2D(x->1-(1/3D)*Math.exp(-2*x));
Range xRange = new Range(-10,10);

shows an empty window

but

Func2D fExp = new Func2D(x->1-(1/3D)*Math.exp(-2*x));
Range xRange = new Range(-5,10);

shows