[vtkusers] Question about model bounds

[Nikita Kojekine AKA Kitya Karlson]

Hello!
I use such code (i get it from examples) to create the surface
of my implicit function:

vtkSampleFunction *spline = vtkSampleFunction::New();
    spline->SetImplicitFunction(func);
 spline->SetModelBounds(-1,1.5,-1.25,1.25,-1.25,1.25);
 spline->SetSampleDimensions(25,25,25);
    spline->ComputeNormalsOff();

Could you explain me the meaning of each parameter of SetModelBounds()
and SetSampleDimensions()
I cannot found it in the Book :(
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