I want to render blocks from a generated array with Vector3 positional information.
I am getting this error:
As I understand the problem lies in the array parameter that points to nothing? Still, can’t understand how to fix it. 
Vector3[] blockBuffer; //array to store generated information
public Material material;
public Mesh mesh;
GameObject block_name;
// Use this for initialization
void Start () {
blockBuffer = generateBlocks (); //generate block info and store it in the array variable
}
// Update is called once per frame
void Update () {
renderBlocks (blockBuffer); //render blocks with given info in form of array
}
public void renderBlocks(Vector3[] array){ //function to render the blocks
foreach (Vector3 block in array) { //go through the given array
GameObject block_name; //create a game object variable
block_name = new GameObject ("block_name"); //create game object with name
block_name.AddComponent<MeshFilter> ().mesh = mesh; //assign mesh
block_name.AddComponent<MeshRenderer> ().material = material; //assign material
block_name.AddComponent<Transform> ().transform.position = block; //assign new position from array at each iteration
}
}
Vector3[] generateBlocks(){ //generate blocks and store it in array
Vector3[] blockArray = null; //initilize with null (don't know why)
for (int i = 1; i > 9; i++) {
blockArray[i] = new Vector3(-9f + 1f, 1f, 0f); //create a new vector3 and subtracting 1 from x pos each iteration to space out the blocks
}
return blockArray; //return the info
}
Well, right now blockBuffer has no value. Technically, you will get an error in generateBlocks because you are creating a null array.
However, you have a for loop that never runs because you are setting i = 1, but then telling the for to run only if i > 9, which will not happen. If you had it to i < 9, you would get an error there because you have a null array.
You need to initialize your array to the proper size in your generateBlocks and fix your for loop to actually run, then it will return a proper array (one with values and not null) which will then fix the other error you are getting as blockBuffer will no longer be null.
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in GenerateBlocks. you specify that blockArray = null, then try to assign the value at position i.
try this:
Vector3[ ] blockArray = new Vector3[9];
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Brathnann beat me to it. Additionally, C# Arrays start on index 0 so if you write e.g.
int blockArraySize = 9
Vector3[] blockArray = Vector3[blockArraySize]; //initilize with predefined size
for (int i = 1; i < blockArraySize; i++) {
blockArray[i] = new Vector3(-9f + 1f, 1f, 0f); //create a new vector3 and subtracting 1 from x pos each iteration to space out the blocks
}
then element 0 would default to Vector3(0,0,0). (because Vector3 is a value type. if it’d be a reference type like GameObject, it would be null and you’d get a nullpointer again)
instead I guess it should be
for (int i = 0; i < blockArraySize; i++) {
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Thanks for all of you, solved every problem, but I got into recursion… 
So basically public Vector3[] blockData; is assigned to blockData = generateBlocks (); and that points to the
public Vector3[] generateBlocks(){ //generate blocks and store it in array
int blockArraySize = 9;
Vector3[] blockArray = new Vector3[9];
for (int i = 0; i < blockArraySize; i++) {
blockArray[i] = new Vector3(-9 + i, 1f, 0f); //create a new vector3 and subtracting 1 from x pos each iteration to space out the blocks
}
return blockArray; //return the info
}
function, that gets called every updated in
void Update () {
renderBlocks (blockData); //render blocks with given info in form of array
}
as I understand. This problem feels stupidly easy to solve, but how can I go around this phenomenon?
What is your question? You just don’t want to do renderBlocks in update? Just put it in start after your call to assign values to the array.
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LOL, now it’s working as expected, probably I just overthinked the situation, ty. 