2.7.3 Surf3A sample

Function surf3a is similar to surf3 but its transparency is determined by another data. The sample code is:

int sample(mglGraph *gr)
{
 mglData c,d; mgls_prepare3d(&c,&d);
 gr->Title("Surf3A plot"); gr->Rotate(50,60);
 gr->Light(true); gr->Alpha(true);
 gr->Box(); gr->Surf3A(c,d);
 return 0;
}

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