2.7.5 Dens3 sample

Function dens3 draw just usual density plot but at slices of 3D data. The sample code is:

int sample(mglGraph *gr)
{
  mglData c;  mgls_prepare3d(&c);
  gr->Title("Dens3 sample");  gr->Rotate(50,60);
  gr->Alpha(true);  gr->SetAlphaDef(0.7);
  gr->SetOrigin(0,0,0); gr->Axis("_xyz"); gr->Box();
  gr->Dens3(c,"x"); gr->Dens3(c); gr->Dens3(c,"z");
  return 0;
}

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