# must call manually call Render() every frame after SetOffScreenRendering(1)?

**URL:** https://discourse.vtk.org/t/must-call-manually-call-render-every-frame-after-setoffscreenrendering-1/11808
**Category:** Support
**Created:** [June 25, 2023, 2:43am UTC](https://discourse.vtk.org/t/must-call-manually-call-render-every-frame-after-setoffscreenrendering-1/11808 "2023-06-25T02:43:33Z")
**Posts on this page:** 1
**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 25, 2023, 2:43am UTC](https://discourse.vtk.org/t/must-call-manually-call-render-every-frame-after-setoffscreenrendering-1/11808/1 "2023-06-25T02:43:34Z")

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must call manually call Render() every frame after SetOffScreenRendering(1)?  
how to write this loop normally?  
found that after SetOffScreenRendering(1), Render() was not called after Start() as there is no Win32Window, etc.