How can I identify where a Mesh and Particle System intersect in Three.js?

I have a unique setup where I have a particle system utilizing sprites, housed in an Object3D akin to the "interactive / points" example from three.js. Additionally, I have a simple sphere mesh that tracks my cursor's movements.

Check out the example here

https://i.sstatic.net/3Mug7.png

I am looking for the most efficient method to identify when two of these objects intersect. My goal is to manipulate the particles with the sphere, but I first need to compile an array of points that fall "inside the sphere". Any suggestions would be greatly appreciated. Thank you!

Answer №1

One way to determine if a point lies inside or outside a sphere is by projecting a ray from the point in a specified direction and then calculating the number of intersections between the ray and the triangles of the sphere's geometry. If the number of intersections is odd, the point is inside the sphere; if it is even, the point is outside.

For a demonstration of particles being injected into a mesh using the same principle, you can check out this example: https://github.com/heroncendre/Volpar

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