What's the name of the interference effect between two planes placed close to each other?

Questions
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  1. What’s the name of the interference effect between two planes placed close to each other please? e.g. between the red and grey planes shown below:

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(The blue plane is raised up from grey plane by Number.EPSILON * 1e12 where as red is only seperated by Number.EPSILON * 1e11).

And I also wanted to know what the minimum distance was needed to seperate two planes so that they did not show the interference pattern.
2. It seems like it’s Number.EPSILON * 1e12?
3. Will this work in all circumstances?
4. And is this documented anywhere? (My searches for it haven’t turned up anything, perhaps because I don’t know what this interference effect is called).

Thank you! :slight_smile:

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Z-Fighting - Z-fighting - Wikipedia

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This is called z-fighting
In my experience the distance the red plane must be lifted by depends on other variables in the scene.
Is the camera 10 units or 1000 unit distance from the plane, what’s the camera.minZ, etc.
at 10 units, lifting the plane by 0.0001 should even be enough.

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