[vtkusers] Polygon colouring

Gib Bogle g.bogle at auckland.ac.nz
Sun Oct 19 20:27:40 EDT 2014

Thanks Bill.  Following David Gobbi's suggestion, I got something working in a similar way to the ColorCellsWithRGB example.  But I can't say I fully understand it.  Specifically, I don't see why this statement

or in my code

sets the colours.  How is it that the vtkUnsignedCharArray is interpreted as providing colours?

From: Bill Lorensen [bill.lorensen at gmail.com]
Sent: Monday, 20 October 2014 12:39 a.m.
To: Gib Bogle
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] Polygon colouring


Here are a couple of examples:


On Sat, Oct 18, 2014 at 10:18 PM, Gib Bogle <g.bogle at auckland.ac.nz> wrote:
> I'm rendering a shape using vtkPolyData, i.e. as a collection of polygons.
> Is there a way to colour each polygon separately?
> polygonPolyData = vtkSmartPointer<vtkPolyData>::New();
> polygonPolyData->SetPoints(points);
> polygonPolyData->SetPolys(polygons);
> hexmapper = vtkSmartPointer<vtkPolyDataMapper>::New();
> hexmapper->SetInput(polygonPolyData);
> hexactor = vtkSmartPointer<vtkActor>::New();
> hexactor->SetMapper(hexmapper);
> ren->AddActor(hexactor);
> Thanks
> Gib
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