# Weird rendering that some actors become boxes automatically when mouse down.

**URL:** https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129
**Category:** Support
**Created:** [August 11, 2022, 9:49am UTC](https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129 "2022-08-11T09:49:00Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![AlexLuya](https://discourse.vtk.org/user_avatar/discourse.vtk.org/alexluya/32/4036_2.png) [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)
#### Post date: [August 11, 2022, 9:49am UTC](https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129/1 "2022-08-11T09:49:00Z")

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[/uploads/default/original/2X/a/aae97a6bcf464fa2387729534b434c276e0836df.mp4](https://discourse.vtk.org/uploads/default/original/2X/a/aae97a6bcf464fa2387729534b434c276e0836df.mp4)

 ![Workspace 1_1478](https://discourse.vtk.org/uploads/default/original/2X/8/8b16f3c711e5a1a36f014d2a32148258ee81ef34.jpeg)

As you can see in the video,some actors become boxes and when mouse down,and everything recovers normally after mouse up.Both happends automatically.I haven’t add any code to do these.

These happen more offen when the camera distance become large enough under some windows machine(Reproducible).Under some linux machine,this happends frequently(reproducable) even camera distance is small.

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### Author: ![Sebastien\_Jourdain](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sebastien_jourdain/32/100_2.png) [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [August 11, 2022, 5:27pm UTC](https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129/2 "2022-08-11T17:27:06Z")

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Just change the LOD parameters of your actors.

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### Author: ![AlexLuya](https://discourse.vtk.org/user_avatar/discourse.vtk.org/alexluya/32/4036_2.png) [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)
#### Post date: [August 12, 2022, 2:22am UTC](https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129/3 "2022-08-12T02:22:04Z")

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Thanks,I checked the vtkLODActor,and only few functions available,would you please tell me what parameters should be chagned

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### Author: ![Paulo\_Carvalho](https://discourse.vtk.org/user_avatar/discourse.vtk.org/paulo_carvalho/32/370_2.png) [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [August 12, 2022, 2:00pm UTC](https://discourse.vtk.org/t/weird-rendering-that-some-actors-become-boxes-automatically-when-mouse-down/9129/4 "2022-08-12T14:00:10Z")

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Hello,

Here’s my two cents: [https://vtk.org/doc/nightly/html/classvtkLODActor.html](https://vtk.org/doc/nightly/html/classvtkLODActor.html) . From there, you can go to some examples of `vtkLODActor` applications. Maybe you can get some light on its parameters there.

take care,

Paulo