Extract color information per vertex

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Hi vtkusers,

I have a quick question about reading the color information stored in a ply
file.

The following code extracts the xyz coordinate of a given vertex, but how
to read the RGB value associated to each vertex?

vtkSmartPointer<vtkPLYReader> reader = vtkSmartPointer<vtkPLYReader>::New();
reader->SetFileName("input_with_color.ply");
reader->Update();

vtkSmartPointer<vtkPolyData> polyData = reader->GetOutput();
vtkSmartPointer<vtkPoints> vertices = polyData->GetPoints();
double xyz[3];
vertices->GetPoint(idx, xyz);

I guess we can use
polyData->GetPointData()->GetArray("???")
but not sure how to do that.  Would appreciate any pointers or examples!

Thanks,
Bing

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">Hi vtkusers,<div><br></d=
iv><div>I have a quick question about reading the color information stored =
in a ply file.</div><div><br></div><div>The following code extracts the xyz=
 coordinate of a given vertex, but how to read the RGB value associated to =
each vertex?=C2=A0</div><div><br></div><div><div><div>vtkSmartPointer&lt;vt=
kPLYReader&gt; reader =3D vtkSmartPointer&lt;vtkPLYReader&gt;::New();</div>=
<div>reader-&gt;SetFileName(&quot;input_with_color.ply&quot;);</div><div>re=
ader-&gt;Update();</div><div><br></div><div>vtkSmartPointer&lt;vtkPolyData&=
gt; polyData =3D reader-&gt;GetOutput();</div><div>vtkSmartPointer&lt;vtkPo=
ints&gt; vertices =3D polyData-&gt;GetPoints();</div><div>double xyz[3];</d=
iv><div>vertices-&gt;GetPoint(idx, xyz);</div></div></div><div><br></div><d=
iv>I guess we can use=C2=A0</div><div>polyData-&gt;GetPointData()-&gt;GetAr=
ray(&quot;???&quot;)<br></div><div>but not sure how to do that.=C2=A0 Would=
 appreciate any pointers or examples!</div><div><br></div><div>Thanks,</div=
><div>Bing</div><div><br></div><div><div><br></div></div></div></div></div>

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