I have a system of particles with equal distance with each other and another at random positions which is moving with time. I want to know:
a) The method by which I can reduce the number of particles from the first system, as I know the maximum motion of any particle is X.
b) How to efficiently calculate the collision between them, I have heard about quadtree and octree but (as per I understood till now) they are for collision of particle from each other. In my problem,second system of particles doesn't collide with each other.
Note: Sorry, if it is a very basic question, I am (very) new to this field.