[vtkusers] (no subject)

[weixuegong]

The mapper is vtkDataSetMapper, and I use the default setting.
It is sure that the values of params of setTuple3() is 0~255.
Should I not use the setup of the mapper by default?

I removed "reader->Update()" in case of reloading the data on disk, but 
it didn't work.



> Then is the setup of the mapper that is wrong.
> Moreover, do you know if the data array is an unsigned char one?
>
>
>
>
> On Sun, Jul 13, 2014 at 7:19 PM, weixue gong <weixuegong at gmail.com 
> <mailto:weixuegong at gmail.com>> wrote:
>
>     I got the data of points. Then :
>     vtkDataArray* scalars = reader->getOutput()->getPointData()->
>     getScalars();
>     scalars->setTuple3(i, r, g, b);
>     data->setScalars(scalars);
>     reader->Update();
>
>     but the color didn't changed, is there any step I did wrong?
>
>
>
>     2014-07-13 22:49 GMT+08:00 Sebastien Jourdain
>     <sebastien.jourdain at kitware.com
>     <mailto:sebastien.jourdain at kitware.com>>:
>
>         POINT_DATA means that you should call ->GetPointData() instead
>         of ->GetCellData().
>
>
>         On Sun, Jul 13, 2014 at 8:00 AM, 公维学 <weixuegong at gmail.com
>         <mailto:weixuegong at gmail.com>> wrote:
>
>             Now I have an vtkDataSet object from a reader.I had tried
>             to change the color of the output of vtkDataSetReader(not
>             set the color of actor), but had no idea.
>
>             The reason is that I want to write the dataset back to
>             hard disk with the new color.
>             I could get the number of cells in this dataset, and when
>             I tried to get the scalars and modify the scalars(it holds
>             the color, am I right), it crushed.
>             this->reader->Update();
>                 vtkDataSet* ds = reader->GetOutput();
>                 vtkCellData* cellData = ds->GetCellData();
>                 vtkDataArray* scalars = cellData->GetScalars();
>                 int size = scalars->GetSize();//equals to the number
>             of cells in dataset?
>                 //then we can modify scalars...
>             I am not sure if it is the right way, and I googled it,
>             but found nothing helpful,
>             The vtk file was converted from vrml.and it has about 332
>             points, 110 lines, 102 polygons,and I found in this file
>             there were:
>             POINT_DATA 332
>             COLOR_SCALARS VRMLColor 3
>             So, could any one give me some tips?
>
>
>                 Any advice would be appreciated!
>
>
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