CODEWITHSUNDEEP
c#unity-game-engine
Tayab
Tayab

Reputation: 311

How to make invisible game object with transparent/diffuse with alpha 0 to visible alpha 255 over time

Good day all.

I'm making a tower defense game in Unity3D and I'm trying to create a tower build animation.

So basically, for testing purposes, I have a primitive cube with a material with the transparent/diffuse legacy shader and I've set it's color's alpha to 0 as the tower should be completely invisible when created. It has a Tower script attached to it for the animation. I have another script which deals with the placement of the tower cube.

How do I make a tower completely visible with alpha of 255 of it's material's color when it's created over a certain amount of time?

So if the tower's build time is 5 seconds, the alpha should become from 0 to 255 in 5 seconds.

I've tried the following (Tower.cs):

public float buildTime = 10;

private MeshRenderer mr;;
private Color currentColor;
private bool built = false;

void Start() {
    mr = GetComponent<MeshRenderer>()
    currentColor = mr.material.color;
    StartCorroutine(BuildAnimation());
}

IEnumerator BuildAnimation() {
    float a = 0;
    Color newColor = new Color(currentColor.r, currentColor.g, currentColor.b, a);
    while (!built) {
        mr.material.color = newColor;
        if (a >= 255) {
            built = true;
        }
        a+= 255 / buildTime;
        yield return new WaitForSeconds(255 / buildTime);
    }
}

Help will really be appreciated, thanks in advance!

Upvotes: 1

Views: 424

Answers (2)

Tayab
Tayab

Reputation: 311

Thanks @Martin Mazza Dawson for the answer. Although it wasn't working properly at first I got it working with a simple fix.

IEnumerator Fade(MeshRenderer myMesh)
{
    for (float t = 0f; t < FadeTime; t += Time.deltaTime)
    {
        float normalizedTime = t / FadeTime;

        _alpha = Mathf.Lerp(_startAlpha, _endAlpha, normalizedTime);
        // The fix
        myMesh.material.color = new Color (myMesh.material.color.r, myMesh.material.color.g, myMesh.material.color.b, _alpha);
        yield return null;
    }
    //_alpha = _endAlpha; 
    //myMesh.material.color = new Color (myMesh.material.color.r, myMesh.material.color.g, myMesh.material.color.b, _alpha);
}

Love you :)

Upvotes: 0

Martin Dawson
Martin Dawson

Reputation: 7656

[Tooltip("Time to fade in seconds")]
public float FadeTime;
private float _alpha = 0.0f;
private const float _startAlpha = 0f;
private const float _endAlpha = 1.0f;

IEnumerator Fade(MeshRenderer myMesh)
{
    for (float t = 0f; t < FadeTime; t += Time.deltaTime)
    {
        float normalizedTime = t / FadeTime;

        _alpha = Mathf.Lerp(_startAlpha, _endAlpha, normalizedTime);

        yield return null;
    }
    _alpha = _endAlpha; 
    myMesh.material.color = new Color(myMesh.material.color.r,myMesh.material.color.g,myMesh.material.color.b,_alpha)
}

Then pass your Mesh through through the Fade().

Upvotes: 1

Related Questions