# Render() was called after Start() when not offScreen, but not called when offScreen

**URL:** <https://discourse.vtk.org/t/render-was-called-after-start-when-not-offscreen-but-not-called-when-offscreen/11764>\
**Category:** Development\
**Created:** [June 19, 2023, 3:07pm UTC](https://discourse.vtk.org/t/render-was-called-after-start-when-not-offscreen-but-not-called-when-offscreen/11764 "2023-06-19T15:07:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gpu](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/g/e47c2d/32.png) [@gpu](https://discourse.vtk.org/u/gpu)\
**Post date:** [June 19, 2023, 3:07pm UTC](https://discourse.vtk.org/t/render-was-called-after-start-when-not-offscreen-but-not-called-when-offscreen/11764/1 "2023-06-19T15:07:45Z")

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after SetOffScreenRendering(1), Render() was not called after Start().  
However, when SetOffScreenRendering(0), Render() was called after Start(). why?  
thanks

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<div class="post-metadata">

**Author:** ![gpu](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/g/e47c2d/32.png) [@gpu](https://discourse.vtk.org/u/gpu)\
**Post date:** [June 25, 2023, 2:45am UTC](https://discourse.vtk.org/t/render-was-called-after-start-when-not-offscreen-but-not-called-when-offscreen/11764/2 "2023-06-25T02:45:37Z")

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sorry, wrong place, pls delete this, thanks