Okay, let me try to explain physically based rendering like you’re five.👶

Imagine you want to draw a picture of a shiny ball on a piece of paper.🎨 You might use a red crayon to color the ball and then use a white crayon to make a bright spot on the ball where the light is hitting it.✨

But what if you want to make your picture look more realistic?🤔 You might notice that the ball is not just red, but it also reflects some of the colors around it. For example, if there is a blue sky above the ball, you might see some blue on the top of the ball.🌎 And if there is a green grass below the ball, you might see some green on the bottom of the ball.🌱

You might also notice that the bright spot on the ball is not just white, but it also changes depending on how you look at it. For example, if you move your head to the left or right, the bright spot will move too.👀 And if you move closer or farther away from the ball, the bright spot will get bigger or smaller.🔎

Physically based rendering is a way of making pictures on a computer that tries to copy how things look in real life.💻 It uses math and science to figure out how light bounces off different materials and how our eyes see those materials.👁️
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