[vtkusers] (no subject)

[Sebastien Jourdain]

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> 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>:
>
> 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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>
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