Creating a Callback in Three.js for a Clickable Area: Setting up Interactivity in 3D Web Design

After following this tutorial, I successfully exported my 3D model from Blender to a JSON file and displayed it on an HTML page using Three.js. The 3D model is a simple human figure. Now, I want to create clickable regions on the model, such as hands, legs, chest, etc. How can I achieve this? Should I define these regions in Blender or are there alternative methods available for detecting which region is clicked?

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