Text Mesh Pro rendering/performance issue

Questions & Answers
1

Hi, I am making a dialogue system for a game and have run into a weird performance/rendering issue. Basically, I am trying to print a sentence to the screen letter by letter to get the “typing” effect. I made a script that did that and it worked perfectly as intended.

Now, when I started up Unity again without doing any changes what so ever, it stopped working. I checked that the code was fine and it totally is. I also noticed that the text window on the TextMeshPro component in the inspector was updating like it should, letter by letter.

That’s when I thought it might be some performance issue when updating text rapidly, but to my surprise, when I turned the typing speed way down, it was still not updating before the entire sentence was typed out. (see video)

Here is the coroutine that updates the text:

IEnumerator TypeSentence(string sentence)
{

    string currentTypedSentence = "";
    nextButton.SetActive(false);

    foreach (char letter in sentence)
    {
        currentTypedSentence = currentTypedSentence + letter;
        if (currentTypedSentence == sentence)
        {
            nextButton.SetActive(true);
        }
        textSource.SetText(currentTypedSentence);
        yield return new WaitForSeconds(typingSpeed);
    }
}

Here is a video that shows the problem in action:

Notice that the inspector is updating as it should.

Does anyone know what is causing this behavior? Thanks in advance!

Update:

It just started to work again out of the blue for a minute, and then back to not working…

2

I found the issue! I had somehow attached the script on another object as well so there were two instances trying to change the same text at the same time.