Physically based rendering is like using crayons to draw a picture.

You know how when you use a red crayon, it looks different on white paper than on black paper?

That's because the paper affects how the color looks.

In the same way, physically based rendering uses information about how light behaves in the real world to make virtual objects look more realistic.

That means if you draw a red ball, it will look like a red ball no matter what kind of light is shining on it.

Cool, huh?
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