Why is my GameObject in Class Array == null?

Unity Engine
1

hi there…
I’ve written this small script:

This should create GameObjects inside a Subclass Array, and fill the Class values.

The Problem:
Inside the two loops, ‘Block’, ‘TileID’, ‘TopVertex’ and ‘GroundVertex’ are not existant…
as if the Class is empty!
Every value gives NullReference Errors.

I was looking over this code for the whole day now, but can’t find the Problem…

Can anyone guide me in the right direction, please?

2

Nah, you never create any “new BlockmapClass()”
On top of that, you also never create any TopVertex = new int[×]; or GroundVertex = new int[×];

3

i create new BlockmapClass in the CreateMap().
the ints are created right before i fill them.

4

please post your sample code from you geting error.

5

The script is in the startpost…
i updated the link to my version with Constructor.

6

No, he’s right, you never create an instance of BlockmapClass… You just instantiate the size of your array.

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class GameMap_Blockmap : MonoBehaviour {
        public GameObject BasicBlock;
        public Vector2 Mapsize = Vector2.zero;
        private Mesh BasicMesh, CurrentMesh;
        private Vector3 Meshsize, InstantPos;
        private int ix,iy;
        public class BlockmapClass{
                public GameObject Block;
                public int TileID;
                public int[] TopVertex;
                public int[] GroundVertex;
                public BlockmapClass(){
                        Block = new GameObject("BasicBlock");
                        TileID = 0;
                        TopVertex = new int[4];
                        GroundVertex = new int[4];
                }
        }
     
        public BlockmapClass[][] Blockmap;
     
        // Use this for initialization
        void Start () {
                CreateMap();
        }
        public void CreateMap(){
                StartCoroutine(CreateBlocks());
        }
        IEnumerator CreateBlocks(){
                BasicMesh = BasicBlock.GetComponent<MeshFilter>().sharedMesh;
                Meshsize = BasicMesh.bounds.size;
                Blockmap = new BlockmapClass[(int)Mapsize.y][];
                for(iy=0; iy<Mapsize.y; iy++){
                        Blockmap[iy] = new BlockmapClass[(int)Mapsize.x];
                }
                yield return new WaitForEndOfFrame();
                for(iy=0; iy<Mapsize.y; iy++){
                        for(ix=0; ix<Mapsize.x; ix++){
                                Debug.Log(iy + "/" + ix);
                                InstantPos.x = Mapsize.x*Meshsize.x;
                                InstantPos.y = 0;
                                InstantPos.z = Mapsize.y*Meshsize.z;

// HERE
Blockmap[iy][ix] = new BlockmapClass();


                                Blockmap[iy][ix].Block = Instantiate(BasicBlock, InstantPos, Quaternion.Euler(Vector3.zero)) as GameObject;
                             
                                Blockmap[iy][ix].TileID = 0;
                             
                                CurrentMesh = Blockmap[iy][ix].Block.GetComponent<MeshFilter>().sharedMesh;
                             
                                Blockmap[iy][ix].TopVertex[0] = CurrentMesh.triangles[0];
                                Blockmap[iy][ix].TopVertex[1] = CurrentMesh.triangles[1];
                                Blockmap[iy][ix].TopVertex[2] = CurrentMesh.triangles[2];
                                Blockmap[iy][ix].TopVertex[3] = CurrentMesh.triangles[3];
                                Blockmap[iy][ix].GroundVertex[0] = CurrentMesh.triangles[4];
                                Blockmap[iy][ix].GroundVertex[1] = CurrentMesh.triangles[5];
                                Blockmap[iy][ix].GroundVertex[2] = CurrentMesh.triangles[6];
                                Blockmap[iy][ix].GroundVertex[3] = CurrentMesh.triangles[7];
                                Blockmap[iy][ix].Block.transform.parent = transform;
                        }
                        yield return new WaitForEndOfFrame();
                }
        }
}
7

ah - okay
thank you all :slight_smile: