[vtkusers] (no subject)

[weixue gong]

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>:

> 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> 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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