Hi all!
I have 3 vectors with points from one of my modul's. I tried to build 3D plot using Qwt 3D. It is an old but interesting library for 3D plots using openGL. Many hours I'm has been tried to compile this library, and today it was success. Now I have new problem for many-many hours. The simplest way to build curve in this library - create class with reloaded operator with inheritance from class Fucntion.
Qt Code: 
  1. double operator (double x, double y);
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But I can't go this way - i have something like x,y=f1(x),z=f2(x), I mean I have two functions, not one z=f(x,y) like used this operator.
I tried to inheritance from another class Qwt3D::ParametricSurface because he used to build 3D plot operator
Qt Code: 
  1. Qwt3D::Triple operator()(double x, double y);
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And it was success way but only one problem...
I want to had something like that:
3d_mainwindow.gif
But I have that:
fa6fe89c4b60.jpg
It's just a curve and i don't know what i need to do to have nice plot like first Maybe I doing something wrong or something don't understood...
Please help me somebody!
Thanks a lot!

P.S. that's a code that creating plot:

Qt Code: 
  1. Qwt3D::Triple func3D::operator()(double x, double y){
  2.  
  3.  return Qwt3D::Triple(x,proc->getFromPoint(x,"T")/10,proc->getFromPoint(x,"h")/1000);
  4.  
  5. }
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proc is an object that just perform calculation.
x and y substituting buy library, I tried to understand but don't know how.
If return replace with code

Qt Code: 
  1. double v,b,n;
  2.     double c = 1.9;
  3.     v = (c + cos(y)) * cos(x);
  4.     b = (c + cos(y)) * sin(x);
  5.     n = sin(y) + cos(y);
  6.     return Qwt3D::Triple(v,b,n);
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We will have:
f42de7b09123.jpg
I want this result but don't understand what the problem