[vtkusers] need help about basic color mapping

[Mark Wyszomierski]

What are you having problems with though, if I remember correctly the
color map lookup table classes have a member function like
AddNewPoint(scalar, red, green, blue), just like you need it,

Mark

On Nov 15, 2007 10:52 AM, Toron J. <ji_wi at yahoo.com> wrote:
> Hi,
>
> I want to use color mapping to represent the temperature on a 3D surface.
> The surface mesh contains 900 vertices stored in an obj file. The
> temperature is related to the vertex ID like the following format in a txt
> file.
> .....
> 50 87.4
> 51 85.2
> 52 74.9
> 53 78.3
> 54 80.6
> .....
>
> My code for drawing the surface (textured) is below,
> //*******************************************************
>     vtkOBJReader *reader = vtkOBJReader::New();
>     reader->SetFileName("surf.obj");
>
>     vtkPolyDataNormals *normals = vtkPolyDataNormals::New();
>     normals->SetInput(reader->GetOutput());
>
>     vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
>     mapper->SetInput(normals->GetOutput());
>
>     vtkBMPReader *texReader = vtkBMPReader::New();
>     texReader->SetFileName("textu.bmp");
>
>     vtkTexture *texture = vtkTexture::New();
>     texture->SetInput(texReader->GetOutput());
>
>     vtkActor *actor = vtkActor::New();
>     actor->SetTexture(texture);
>     actor->SetMapper(mapper);
>
>     vtkRenderer *renderer = vtkRenderer::New();
>     renderer->AddActor(actor);
>
>     vtkRenderWindow *renwindow = vtkRenderWindow::New();
>     renwindow->AddRenderer(renderer);
>     renwindow->SetSize(500, 500);
> //**************************************************
>
> I do not know how to convert the temperature data to color map on this
> surface. I have read rainbow.tcl but still do not understand it.  Does
> anyone can point out the procedure or show me any similar example?  Thanks a
> lot!
>
> Toron
>
>
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