2.7.7 ContF3 sample

ContF3 draw just usual filled contours but at slices of 3D data. The sample code is:

int sample(mglGraph *gr)
{
  mglData c;  mgls_prepare3d(&c);
  gr->Title("ContF3 sample");  gr->Rotate(50,60);
  gr->Alpha(true);  gr->SetAlphaDef(0.7);
  gr->SetOrigin(0,0,0); gr->Axis("_xyz"); gr->Box();
  gr->ContF3(c,"x");  gr->ContF3(c);    gr->ContF3(c,"z");
  gr->Cont3(c,"kx");  gr->Cont3(c,"k"); gr->Cont3(c,"kz");
  return 0;
}

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