Alternatives to Render Textures?

Hi there, I was just wondering if there are other ways of achieving the same effect without having to use render textures for, hypothetically, viewing the screen of a phone while it’s in camera mode, or the screen of a digital camera.

I played around a little with adding a camera as the child of the object I’d like and messing with camera.rect to change the size and position of the camera on screen, but it’s less than practical for a lot of things.

Any information would be appreciated, thanks. =)

This might help:

I haven’t tried it but it seems kind of slow so don’t do it for every frame.

There is also a blog post about it: Coding A Free Alternative To Unity Pro’s Render Texture | Jack Donovan | Game Programmer

You could try to contact the writer and ask about it.