How to run OpenGL render outside the GUI thread

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I am using OpenGL to render many 3D models (like obj and fbx) to thumbnail images, then save them to the disk.

I loop all the 3D file in a folder then render them with the grabFramebuffer() function to get all the thumbnail images:

enter image description here

I am using QT 5.15 and QOpenglWidget class to do this. Everything is OK except this is work by the GUI thread.The main app is frozen until all thumbnail work is done.

How can I run OpenGL render in another thread?

opengl qt multithreading
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