Create CullingGroupExample.cs

Author: unitycoder

Assets/Scripts/Docs/UnityEngine/CullingGroupExample.cs

@@ -0,0 +1,85 @@
+// gets nearby objects using CullingGroup
+// Assign this script to some gameobject, that the distance is measured from
+
+using UnityEngine;
+
+namespace UnityLibrary
+{
+    public class CullingGroupExample : MonoBehaviour
+    {
+        // just some dummy prefab to spawn (use default sphere for example)
+        public GameObject prefab;
+
+        // distance to search objects from
+        public float searchDistance = 3;
+
+        int objectCount = 5000;
+
+        // collection of objects
+        Renderer[] objects;
+        CullingGroup cullGroup;
+        BoundingSphere[] bounds;
+
+        void Start()
+        {
+            // create culling group
+            cullGroup = new CullingGroup();
+            cullGroup.targetCamera = Camera.main;
+
+            // measure distance to our transform
+            cullGroup.SetDistanceReferencePoint(transform);
+
+            // search distance "bands" starts from 0, so index=0 is from 0 to searchDistance
+            cullGroup.SetBoundingDistances(new float[] { searchDistance, float.PositiveInfinity });
+
+            bounds = new BoundingSphere[objectCount];
+
+            // spam random objects
+            objects = new Renderer[objectCount];
+            for (int i = 0; i < objectCount; i++)
+            {
+                var pos = Random.insideUnitCircle * 30;
+                var go = Instantiate(prefab, pos, Quaternion.identity);
+                objects[i] = go.GetComponent<Renderer>();
+
+                // collect bounds for objects
+                var b = new BoundingSphere();
+                b.position = go.transform.position;
+
+                // get simple radius..works for our sphere
+                b.radius = go.GetComponent<MeshFilter>().mesh.bounds.extents.x;
+                bounds[i] = b;
+            }
+
+            // set bounds that we track
+            cullGroup.SetBoundingSpheres(bounds);
+            cullGroup.SetBoundingSphereCount(objects.Length);
+
+            // subscribe to event
+            cullGroup.onStateChanged += StateChanged;
+        }
+
+        // object state has changed in culling group
+        void StateChanged(CullingGroupEvent e)
+        {
+            // if we are in distance band index 0, that is between 0 to searchDistance
+            if (e.currentDistance == 0)
+            {
+                objects[e.index].material.color = Color.green;
+            }
+            else // too far, set color to red
+            {
+                objects[e.index].material.color = Color.red;
+            }
+        }
+
+        // cleanup
+        private void OnDestroy()
+        {
+            cullGroup.onStateChanged -= StateChanged;
+            cullGroup.Dispose();
+            cullGroup = null;
+        }
+
+    }
+}