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Assets/Plugins/MeshCombineStudio/Scripts/Mesh/ObjectSpawner.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace MeshCombineStudio
+{
+    [ExecuteInEditMode]
+    public class ObjectSpawner : MonoBehaviour
+    {
+        public GameObject[] objects;
+
+        public Vector3 spawnArea = new Vector3(512, 512, 512);
+        public float density = 0.5f;
+        public Vector2 scaleRange = new Vector2(0.5f, 2f);
+        public Vector3 rotationRange = new Vector3(5, 360, 5);
+        public Vector2 heightRange = new Vector2(0, 1);
+
+        public float scaleMulti = 1;
+
+        public float metersBetweenSpawning = 2;
+        public bool spawnInRuntime;
+        public bool spawn;
+        public bool deleteChildren;
+
+
+        Transform t;
+
+        private void Awake()
+        {
+            t = transform;
+
+            if (spawnInRuntime && Application.isPlaying)
+            {
+                Spawn();
+            }
+        }
+
+        private void Update()
+        {
+            if (spawn)
+            {
+                spawn = false;
+                Spawn();
+            }
+            if (deleteChildren)
+            {
+                deleteChildren = false;
+                DeleteChildren();
+            }
+        }
+
+        public void DeleteChildren()
+        {
+            Transform[] transforms = GetComponentsInChildren<Transform>();
+
+            for (int i = 0; i < transforms.Length; i++)
+            {
+                if (t != transforms[i] && transforms[i] != null) DestroyImmediate(transforms[i].gameObject);
+            }
+
+#if UNITY_EDITOR
+            if (!Application.isPlaying) UnityEditor.SceneManagement.EditorSceneManager.MarkSceneDirty(gameObject.scene);
+#endif
+        }
+
+        void SetObjectsActive(bool active)
+        {
+            for (int i = 0; i < objects.Length; i++)
+            {
+                objects[i].SetActive(active);
+            }
+        }
+
+        public void Spawn()
+        {
+            SetObjectsActive(true);
+            Bounds bounds = new Bounds();
+            bounds.center = transform.position;
+            bounds.size = spawnArea;
+
+            float xStart = bounds.min.x;
+            float xEnd = bounds.max.x;
+            float yStart = bounds.min.y;
+            float yEnd = bounds.max.y;
+            float zStart = bounds.min.z;
+            float zEnd = bounds.max.z;
+
+            int objectCount = objects.Length;
+            float halfRes = metersBetweenSpawning * 0.5f;
+            float heightOffset = transform.lossyScale.y * 0.5f;
+            int count = 0;
+
+            for (float z = zStart; z < zEnd; z += metersBetweenSpawning)
+            {
+                for (float x = xStart; x < xEnd; x += metersBetweenSpawning)
+                {
+                    for (float y = yStart; y < yEnd; y += metersBetweenSpawning)
+                    {
+                        int index = Random.Range(0, objectCount);
+                        float spawnValue = Random.value;
+                        if (spawnValue < density)
+                        {
+                            Vector3 pos = new Vector3(x + Random.Range(-halfRes, halfRes), yStart + (Random.Range(0, bounds.size.y) * Random.Range(heightRange.x, heightRange.y)), z + Random.Range(-halfRes, halfRes));
+                            if (pos.x < xStart || pos.x > xEnd || pos.y < yStart || pos.y > yEnd || pos.z < zStart || pos.z > zEnd) continue;
+                            pos.y += heightOffset;
+                            Vector3 eulerAngles = new Vector3(Random.Range(0, rotationRange.x), Random.Range(0, rotationRange.y), Random.Range(0, rotationRange.z));
+                            GameObject go = (GameObject)Instantiate(objects[index], pos, Quaternion.Euler(eulerAngles));
+                            float scale = Random.Range(scaleRange.x, scaleRange.y) * scaleMulti;
+                            go.transform.localScale = new Vector3(scale, scale, scale);
+                            go.transform.parent = t;
+                            ++count;
+                        }
+                    }
+                }
+            }
+
+            SetObjectsActive(false);
+
+#if UNITY_EDITOR
+            if (!Application.isPlaying) UnityEditor.SceneManagement.EditorSceneManager.MarkSceneDirty(gameObject.scene);
+#endif
+
+            Debug.Log("Spawned " + count);
+        }
+
+        private void OnDrawGizmosSelected()
+        {
+            Gizmos.DrawWireCube(transform.position + new Vector3(0, 0, 0), spawnArea);
+        }
+    }
+}