CODEWITHSUNDEEP
c#unity-game-enginetransparencyopacity
infinity
infinity

Reputation: 99

How can I decrease opacity in unity?

I see this subject in stack over flow but I think it is false Making an object 'transparent' so it cannot be seen is not the most efficient way to do things. What you rather want to do is make the renderer inactive when you don't want to see it, and active when you do.

If you click on your gameObject in the editor, there should be a Mesh Renderer as one of the components.

To set it to inactive from a script attached to this same gameObject, you can do this...

gameObject.GetComponent<Renderer> ().enabled = false;

If you really want to use transparency, you can do this...

gameObject.GetComponent<Renderer> ().material.color.a = 0;

Although if you are setting transparency, you need to make sure the shader the material is using supports transparency. I would suggest using the Legacy Shaders/Transparent Diffuse shader.

How I can use:

gameObject.GetComponent<Renderer> ().material.color.a = 0;

Upvotes: 9

Views: 78859

Answers (4)

Muhammad Faizan Khan
Muhammad Faizan Khan

Reputation: 10561

  1. Select your material and change its Rendering Mode to Transparent.

  2. Then, add the below script.

    using UnityEngine;

    public class MakeTransparent : MonoBehaviour { public GameObject currentGameObject; public float alpha = 0.5f;//half transparency

    void Start()
{
    currentGameObject = gameObject;    
}

void Update()
{
    ChangeAlpha(currentGameObject.GetComponent<Renderer>().material, alpha);
}

void ChangeAlpha(Material mat, float alphaVal)
{
    Color oldColor = mat.color;
    Color newColor = new Color(oldColor.r, oldColor.g, oldColor.b, alphaVal);
    mat.SetColor("_Color", newColor);

}

    }

Change the alpha value in the inspector on runtime.

Here is the video explanation.

Upvotes: 0

Pietro Spagnolo
Pietro Spagnolo

Reputation: 3

Try in this way

var other : GameObject;
other.renderer.material.color.a = 0.5f; // 50 % transparent
other.renderer.material.color.a = 1.0f; // 100% visible

Upvotes: -4

thefreeline
thefreeline

Reputation: 631

For those who might still come across this question, gameObject.GetComponent<Renderer> ().material.color is not a variable. Create a variable as such:

var trans = 0.5f;
var col = gameObject.GetComponent<Renderer> ().material.color;

Then assign your value:

col.a = trans;

Also be aware that not all shaders have a _Color property. In my case, I had to use:

var col = gameObject.GetComponent<Renderer> ().material.GetColor("_TintColor");

Upvotes: 12

Maximilian Gerhardt
Maximilian Gerhardt

Reputation: 5353

How I can use:

gameObject.GetComponent<Renderer> ().material.color.a = 0;

As you already stated in your own question, the object you call this on must have a shader which supports transparency. In Unity5, when using the standard shader, you must explicitly set it to "Transparent" to be able to manipulate the alpha value. enter image description here

It should also be clear to you that the alpha value is a float which goes from 0.0f to 1.0f, so e.g. setting

gameObject.GetComponent<Renderer> ().material.color.a = 0.5f;

will make the object 50% transparent.

Upvotes: 3

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