Unity Sprite on front of camera

Unity Sprite on front of camera

public class TestExecutor : MonoBehaviour
{
    private Texture2D blackTexture;
    private SpriteRenderer testSprite;

    void Start()
    {
        // Create black texture
        blackTexture = new Texture2D(32, 32, TextureFormat.RGB24, false);
        blackTexture.SetPixel(0, 0, Color.white);
        blackTexture.Apply();

        // Create Sprite
        var sprite = Sprite.Create(
          texture: blackTexture,
          rect: new Rect(0, 0, blackTexture.width, blackTexture.height),
          pivot: new Vector2(0.5f, 0.5f)
        );

        // Create Sprite from script
        testSprite = new GameObject("TestSprite").AddComponent<SpriteRenderer>();
        testSprite.sprite = sprite;
    }

    void Update()
    {
        var distance = 10f;

        // https://docs.unity3d.com/Manual/FrustumSizeAtDistance.html
        // calc world screen size, depens on distance from camera
        // (distance +1f) , it is covered screen
        var worldScreenH = 2.0f * (distance + 1f) * Mathf.Tan(Camera.main.fieldOfView * 0.5f * Mathf.Deg2Rad);
        var worldScreenW = worldScreenH * Camera.main.aspect;

        // fixed Sprite size
        testSprite.transform.localScale = new Vector3(worldScreenW / testSprite.sprite.bounds.size.x, worldScreenH / testSprite.sprite.bounds.size.y);

        // copy position and rotation, forward vector is very convenient
        testSprite.transform.position = Camera.main.transform.position + testSprite.transform.forward.normalized * distance;
        testSprite.transform.rotation = Camera.main.transform.rotation;
        
        // when you fading
        testSprite.color = new Color(0, 0, 0, fadingAlpha);
    }
}