Animation Nodes: How to create splines between a particle system and an object based on distance? I would first like to mention that I am a beginner to Blender and Animation Nodes. I am trying to create an animation where an icosphere orbits above a plane that emits particles, and if the particles are close enough to the sphere as it passes, will create a spline between the icosphere and the particle. So far in my animation nodes, I am able to find the distances between the icosphere and the particles, but I am unsure how to implement a sort of if statement (like the find close points node) to select only the particles that are a certain distance away, and then use the create spline to create a spline between the icosphere and these particles. Any help would be greatly appreciated.
It is very easy to do with Animation Nodes by using the KDTree node.
Method:

First construct the KDTree from the position of the particles. Then, use the Find Points in a Radius node to find the points/particles (shown by red color) within a radius from the Vector which is the position of the object (in this case is a Sphere).


Now, to make splines from the Sphere for each red-points/particles, we have to use the Loop node, with which we create a vector list from the sphere's position and each red-points position. Then use the Spline From Points node to create the splines from the previously created vector list, and the Curve Object Output node generates the Curve Object.



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