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Im not sure how to explain this, I've seen the effect done online multiple times.

For example, a bunch of balls simulated to fall on the ground, and once they settle if you look at the top of them all, its like they're perfectly organized to make out an image or word on their materials.

I guess the effect could be similar to this one

https://www.youtube.com/watch?v=S5WAswaJRjw

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The trick is simple: this is 'bake to the future'!

enter image description here

Once the simulation baked, go to the last frame and you'll know how to color the balls.

Here (but this is just an example as the materials could be totally different), I've assigned the object pass index knowing the positions at the last frame and used it to drive the color.

enter image description here

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Do you mean picture ...

enter image description here enter image description here

  • Scene Properties > Riggid Body > Bake
  • Go to last frame of animation
  • Select all balls, go to camera view and switch to Edit mode
  • Unwrapp from View

enter image description here

Note: for animation I used Particles System (Plane object) Rendered as Objects (Sphere) - they are disabled from Outliner now. Particle system than converted to objects with addon Copy Particles to Riggid Bodies.

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