# How can I get this result use vtk 8.2？ When i pick a actor, will draw it's outline.

**URL:** https://discourse.vtk.org/t/how-can-i-get-this-result-use-vtk-8-2-when-i-pick-a-actor-will-draw-its-outline/3097
**Category:** Support
**Created:** [April 19, 2020, 1:34pm UTC](https://discourse.vtk.org/t/how-can-i-get-this-result-use-vtk-8-2-when-i-pick-a-actor-will-draw-its-outline/3097 "2020-04-19T13:34:39Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![nabor-wang](https://discourse.vtk.org/user_avatar/discourse.vtk.org/nabor-wang/32/1699_2.png) [@nabor-wang](https://discourse.vtk.org/u/nabor-wang)
#### Post date: [April 19, 2020, 1:34pm UTC](https://discourse.vtk.org/t/how-can-i-get-this-result-use-vtk-8-2-when-i-pick-a-actor-will-draw-its-outline/3097/1 "2020-04-19T13:34:39Z")

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The image is show what i want. The middle actor is in selected state.It show the actor outline. I search some topics, but i also don’t know how to do it. Use shader and add to pass? I am new for VTK. Thanks for your help.  
ps:I use C++.

 ![result](https://discourse.vtk.org/uploads/default/original/2X/b/b92eaee1b03abc95bf2164039b7d1f98934ce25a.jpeg)