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Color.a

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public var a: float;
public float a;

Description

Alpha component of the color (0 is transparent, 1 is opaque).

var color : Color = Color.white;
color.a = 0;

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Color color = Color.white;
    void Example() {
        color.a = 0;
    }
}
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