Post Process Material based zoom

The scope zoom of the gun uses the FOV of the camera and 'Post Process Material based zoom' is not always the best choice.

But it may be needed for special effects(if pixel enlargement is required?). And it is also good for learning because it is simple.


Step 1. Basic

This is the result.

Step 2. Problem

If you zoom out, there is a problem outside the image.

Step 3. Remove outer area

This is an improved version.
Efficiently determine the outside and inside with Frac nodes.


Step 4. Final



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