# Question about vtkHardWareSelector

**URL:** https://discourse.vtk.org/t/question-about-vtkhardwareselector/6161
**Category:** Support
**Created:** [July 9, 2021, 3:14pm UTC](https://discourse.vtk.org/t/question-about-vtkhardwareselector/6161 "2021-07-09T15:14:33Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![yuhaoqiu](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/y/3e96dc/32.png) [@yuhaoqiu](https://discourse.vtk.org/u/yuhaoqiu)
#### Post date: [July 9, 2021, 3:14pm UTC](https://discourse.vtk.org/t/question-about-vtkhardwareselector/6161/1 "2021-07-09T15:14:33Z")

</div>

I noticed that vtkHardwareSelector provided a function for mappers to support hardware selection without having to rebuild any of their VBO/IBOs to maintain fast picking performance.  
Here is my code,I wish to re-color the selected cells to red(1,0,0)  
…  
vtkNew selector\_;

```
       selector_->SetRenderer(renderer_);

        selector_->SetArea(selectsize);
        
        selector_->SetFieldAssociation(vtkDataObject::FIELD_ASSOCIATION_CELLS);

        renderer_->GetRenderWindow()->Render();

        selector_->SetPropColorValue(1,0,0);

        selector_->Modified();
        
        selection_ = selector_->Select();

        renderer_->GetRenderWindow()->Render();

```

…  
But after I select,nothing happened.Selected part doesn’t change color.  
Any help?