[vtkusers] multi-component data arrays..

[Lisa S. Avila]

Hello,

You must define the number of components before the number of tuples.

Lisa


At 07:32 PM 7/25/2002, K.R.Subramanian wrote:

>I have consistently had troubles in using multicomponent data arrays.
>
>I wrote a simple program that uses a 3 component unsigned char array to be
>used to color map some scalar data, but the program seems to die almost all
>the time. The same program with just a single component has no problem at all.
>Are there any known bugs?
>
>Thanks.
>
>     -- krs
>
>Here is the code segment I am using..
>
>
>vtkStructuredGrid *sg;
>     vtkActor *a, *a2[8];
>
>     sg = vtkStructuredGrid::New();
>         sg->SetDimensions (TRes, NMetrics, 1);
>
>     vtkPoints *pts = vtkPoints::New();
>         pts->SetNumberOfPoints(TRes*NMetrics);
>
>     vtkUnsignedCharArray *uca = vtkUnsignedCharArray::New();
>         uca->SetNumberOfTuples (TRes*NMetrics);
>         uca->SetNumberOfComponents (3);
>
>     sg->GetCellData()->SetScalars (uca);
>     sg->SetPoints (pts);
>
>     float val;
>     float *col = new float[3];
>     for (k = n = 0; k < NMetrics; k++)
>     {
>         for (i = 0; i < TRes; i++)
>         {
>             switch (k)
>             {
>                 case 0:
>                     val = 0.;
>                     col[0] = 255; col[1] = 0; col[2] = 0;
>                     break;
>                 case 1:
>                     val = dch[i];
>                     col[0] = 0; col[1] = 255; col[2] = 0;
>                     break;
>                 case 2:
>                     val = cpch[i]+dch[i];
>                     col[0] = 0; col[1] = 0; col[2] = 255;
>                     break;
>                 case 3:
>                     val = dcch[i]+cpchc[i]+dch[i]+cpch[i];
>                     col[0] = 255; col[1] = 0; col[2] = 255;
>                     break;
>                 case 4:
>                     val = ul[i];
>                     col[0] = 0; col[1] = 255; col[2] = 255;
>                     break;
>             }
>             r = val*ScaleFact;
>
>             uca->SetTuple (n, col);
>             pts->SetPoint (n++, (float) i, r, 0.);
>         }
>     }
>
>
>
>--
>K.R.Subramanian                        Phone: (704) 687-4872
>Department of Computer Science         FAX:   (704) 687-4893
>UNC Charlotte, CARC 311                Email: krs at cs.uncc.edu
>Charlotte, NC 28223-0001               Web: http://www.cs.uncc.edu/~krs
>
>
>
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