title: How can I find a Plane size and position and spawn random objects over it?
body: <p>I want to spawn random objects over the terrain and also over the plane or only on one of them.</p>
  <p>The spawning objects for the terrain are working but I'm not sure how to do it with the plane.</p>
  <p>To start I can't even find how to get the plane size width and length.</p>
  <pre><code>using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class SideQuests : MonoBehaviour
  {
      public Terrain terrain;
      public Plane plane;
      public GameObject prefab;
      public GameObject parent;
      [Range(10, 1000)]
      public int numberOfObjects = 10;
      public float yOffset = 10f;
  
      private float terrainWidth;
      private float terrainLength;
      private float xTerrainPos;
      private float zTerrainPos;
  
      private float planeWidth;
      private float planeLength;
      private float xPlanePos;
      private float zPlanePos;
  
      void Start()
      {
          //Get terrain size
          terrainWidth = terrain.terrainData.size.x;
          terrainLength = terrain.terrainData.size.z;
  
          //Get terrain position
          xTerrainPos = terrain.transform.position.x;
          zTerrainPos = terrain.transform.position.z;
  
          //Get plane size
          planeWidth = plane.
  
          generateObjectOnTerrain();
      }
  
      void generateObjectOnTerrain()
      {
          for (int i = 0; i &lt; numberOfObjects; i++)
          {
              //Generate random x,z,y position on the terrain
              float randX = UnityEngine.Random.Range(xTerrainPos, xTerrainPos + terrainWidth);
              float randZ = UnityEngine.Random.Range(zTerrainPos, zTerrainPos + terrainLength);
              float yVal = Terrain.activeTerrain.SampleHeight(new Vector3(randX, 0, randZ));
  
              //Apply Offset if needed
              yVal = yVal + yOffset;
  
              //Generate the Prefab on the generated position
              GameObject objInstance = Instantiate(prefab, new Vector3(randX, yVal, randZ), Quaternion.identity);
              objInstance.name = &quot;Quest&quot;;
              objInstance.tag = &quot;Quest&quot;;
              objInstance.transform.parent = parent.transform;
          }
      }
  }
  </code></pre>