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Fragment shader distortion suffers from another issue: heavy distortions require higher resolutions and (depending on distortion type) higher field of view. Even more radical distortions would require cubemaps of undistorted frames to handle fragmens from behind the camera.

This answer suggests some other ideas on implementing lens distortion: https://stackoverflow.com/a/44492971

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Thanks! The cube mapping idea is really interesting — I didn’t know about that approach. However, I doubt it would help in my case, where the distortion is strong enough to flip the depth order of objects.

Maybe these methods could be combined somehow, but it seems simpler to use subdivision (as also mentioned in that thread) — perhaps selectively, for objects near the periphery where distortion is strongest.

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