1

After making changes to a Prefab i get this strange error

NullReferenceException
UnityEngine.Transform.FindChild (System.String name) (at C:/BuildAgent/work/d3d49558e4d408f4/artifacts/EditorGenerated/UnityEngineTransform.cs:366)
Card.SetImage (UnityEngine.Texture texture)
CardManager.Start ()

Strangest thing is that the the debug breakpoint doesnt work anymore. I cant get it to break to debug.

This is in a prefab called Card. It looks like this.

  • Card
    • CardSides
      • Front
      • Back

All the code happens in Card. So i have a reference to CardSides which rotation.Y i am trying to SLERP. But the effect is very weird. Kind of the opposite to if i SLERP the rotation of Card. CardSides is just a container and everything is set to 0 so i dont understand why.

Here is the method where the problem occurs.
void Start ()
{

				canCardBeFlipped = true;

				/* LOAD TEXTURES */
				var objects = Resources.LoadAll ("Cards/");
				foreach (var o in objects) {
						textures.Add (o as Texture);
				}
				//Debug.Log ("I have loaded this many images: " + textures.Count);

				
				/* INSTANTIATE CARDS */
				for (int i = 0; i < startingCards; i++) {
						var prefab = Instantiate (Resources.Load ("Prefabs/Card")) as GameObject;
						var card = prefab.GetComponent<Card> ();
						var texture = (textures [Random.Range (0, textures.Count)]);//randomly set cards image
						var width = texture.width / pixelsPerMeter;
						var height = texture.height / pixelsPerMeter;
						card.SetImage (texture);//HERE IS THE PROBLEM
						var cardX = cardStartingX + (width * i) + (cardMargin * i); 
						var cardY = 20;
						card.transform.Translate (cardX, cardY, 0);			

				}	
		}

Card.SetTexture

	public void SetImage (Texture texture)
		{				
				var front = cardSides.FindChild ("Front");
				
				front.renderer.material.mainTexture = texture;

				cardName = texture.name;
		}
2

Please try replacing Card.SetImage() with this test version.

I think we will confirm cardSides is the culprit. Just check the console for messages while the game runs.

public void SetImage (Texture texture){
      if (!cardSides) Debug.Log("cardSides is null");
      var front = cardSides.FindChild ("Front");

      if (!front) Debug.Log("front is null");
      front.renderer.material.mainTexture = texture;

      cardName = texture.name;
}

If cardSides is null you will have to look are where it should be initialized.

3

Ive solved this. It had to do with several things with the setup of the Gamoe Object hierarchy. Sorry for troubling you.