initial commit

Assets/Scripts/RainDirector.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class RainDirector : MonoBehaviour
+{
+    public Vector3 planetCenter;
+    void Start()
+    {
+        ParticleSystem[] systems = GetComponentsInChildren<ParticleSystem>();
+
+        foreach (ParticleSystem ps in systems)
+        {
+            Vector3 dirToCenter = (planetCenter - transform.position).normalized;
+
+            var velocityOverLifetime = ps.velocityOverLifetime;
+            velocityOverLifetime.enabled = true;
+            velocityOverLifetime.space = ParticleSystemSimulationSpace.World;
+            velocityOverLifetime.x = dirToCenter.x * 20f;
+            velocityOverLifetime.y = dirToCenter.y * 20f;
+            velocityOverLifetime.z = dirToCenter.z * 20f;
+
+            var main = ps.main;
+            main.gravityModifier = 0f;
+        }
+    }
+}