Particle Systems Collider - Blender 2.8+ Addon (No Updates)
Collisions — Blender Manual
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Unity - Manual: Collision module
Blender Noob here: How can I make the particles self collide? : r/blender
How do i get these particles to act as real objects and eventually lay flat against the floor? They are supposed to be coins. They are also slightly going through the floor. :