[vtkusers] (no subject)

[Sebastien Jourdain]

Make sure you call that on the mapper. Moreover, you should make sure that
the data array that contains the color if of type vtkUnsignedCharArray
<http://www.vtk.org/doc/nightly/html/vtkUnsignedCharArray_8h_source.html>

void vtkMapper::SetColorModeToDefault()


On Sun, Jul 13, 2014 at 8:08 PM, weixuegong <weixuegong at gmail.com> wrote:

>  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>
> 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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