How can I render using low-level OpenGL code on a sub component not like the underlay example.

[bigdudu]

How can I render using low-level OpenGL code on a sub component not like the underlay example.

[tronical]

You could try to render into an FBO that's bound to a texture, then import that texture into a slint::Image and use it with an Image element. We've got an example for that https://github.com/slint-ui/slint/tree/master/examples/opengl_texture .