Following this tutorial, you'll learn how to subdivide a plane into a grid. Then make each square of it selectable with the mouse. And also, be able to add objects to the scene right on top of each square.
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Article
https://waelyasmina.net/articles/how-to-subdivide-a-plane-into-selectable-tiles-in-three-js/
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Support the channel
buymeacoffee.com/waelyasmina
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Three.js Tutorial For Absolute Beginners
https://youtu.be/xJAfLdUgdc4
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Project files
https://github.com/WaelYasmina/subdivideplane
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The boilerplate that I'm using in my tutorials
https://github.com/WaelYasmina/ThreeBoilerplate