CODEWITHSUNDEEP
c#unity-game-enginecolorslerp
Abdou023
Abdou023

Reputation: 1664

Lerp the alpha value of a color

I want to change the alpha value (transparency) of a color back and forth:

private void Awake()
{
    material =  gameObject.GetComponent<Renderer>().material;   
    oColor   = material.color; // the alpha here is 0
    nColor   = material.color;
    nColor.a = 255f;
}
private void Update()
{
    material.color = Color.Lerp(oColor, nColor, Mathf.PingPong(Time.time, 1));
}

This doesn't work, the color instantly changes to white, and it keeps blinking the original color. I'm following this.

Upvotes: 3

Views: 9115

Answers (2)

Hristo
Hristo

Reputation: 1815

In fact the alpha color of the Material goes from 0 to 255, however these values in C# are translated from 0 to 1, making 1 equal to 255. This is a script I made a while ago, maybe you can use it:

public class Blink : MonoBehaviour 
{
    public Material m;
    private Color c;
    private float a = .5f;
    private bool goingUp;

    private void Start()
    {
        c = m.color;
        goingUp = true;
    }
    private void Update()
    {
        c.a = goingUp ? .03f + c.a : c.a - .03f;

        if (c.a >= 1f) 
            goingUp = false;
        else if (c.a <= 00)
            goingUp = true;

        m.color = c;
    }
}

Upvotes: 1

user7936802
user7936802

Reputation:

You can try this:

void FixedUpdate ()
{
    material.color = new Color (0f, 0.5f, 1f, Mathf.PingPong(Time.time, 1));
}

Here the color is blue, (RGB 0, 128, 255) the "Mathf.PingPong(Time.time, 1) handles the alpha.

The effect is fully visible when you set the material "rendering mode" to "transparent" in the inspector :)

Note:

  • using the "transparent" rendering mode will make the object transparent when the alpha layer goes down to 0,

  • using the "fade" rendering mode will make the object become completely invisible when the alpha layer goes down to 0.

Upvotes: 0

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