[Part 22] Enemies are not spawning / spawning behind the camera

[Terence]

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Hi everyone, if you run into this issue where the enemies appear to not be spawning, they are likely on the same z-coordinate as your camera, and so cannot be seen.

If this is the case, please update the GeneratePosition() function on your SpawnManager to specify the z-coordinate:

// Creates a new location where we can place the enemy at.
public static Vector3 GeneratePosition()
{
    // If there is no reference camera, then get one.
    if (!instance.referenceCamera) instance.referenceCamera = Camera.main;

    // Give a warning if the camera is not orthographic.
    if (!instance.referenceCamera.orthographic)
        Debug.LogWarning("The reference camera is not orthographic! This will cause enemy spawns to sometimes appear within camera boundaries!");

    // Generate a position outside of camera boundaries using 2 random numbers.
    float x = Random.Range(0f, 1f), y = Random.Range(0f, 1f);

    // Then, randomly choose whether we want to round the x or the y value.
    switch (Random.Range(0, 2))
    {
        case 0:
        default:
            return instance.referenceCamera.ViewportToWorldPoint(new Vector3(Mathf.Round(x), y, 10));
        case 1:
            return instance.referenceCamera.ViewportToWorldPoint(new Vector3(x, Mathf.Round(y), 10));
    }
}

If the value of 10 doesn’t work, you’ll have to play around with and try other values.

[Daniel]

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I made a change so I don’t have to “play” with the value manually and will work if the camera’s Z value changes. Posting here in case someone finds it interesting.

// Then, randomly choose whether we want to round the x or the y value
float cameraZOffset = -instance.referenceCamera.transform.position.z; // Ensures that the spawned entity's Z is 0
switch (Random.Range(0, 2))
{
    case 0: default:
        return instance.referenceCamera.ViewportToWorldPoint(new Vector3(Mathf.Round(x), y, cameraZOffset));
    case 1:
        return instance.referenceCamera.ViewportToWorldPoint(new Vector3(x, Mathf.Round(y), cameraZOffset));
}

• Terence

has upvoted this post.

[Terence]

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I made a change so I don’t have to “play” with the value manually and will work if the camera’s Z value changes. Posting here in case someone finds it interesting.

// Then, randomly choose whether we want to round the x or the y value
float cameraZOffset = -instance.referenceCamera.transform.position.z; // Ensures that the spawned entity's Z is 0
switch (Random.Range(0, 2))
{
    case 0: default:
        return instance.referenceCamera.ViewportToWorldPoint(new Vector3(Mathf.Round(x), y, cameraZOffset));
    case 1:
        return instance.referenceCamera.ViewportToWorldPoint(new Vector3(x, Mathf.Round(y), cameraZOffset));
}

Fantastic. Thanks Daniel.

[Author]

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