LineRenderer Fade Out (Solved)

Hello Everyone,

I have a line renderer with 2 materials in it. I would love to fade it out when necessary.

I tried to change the alpha of the material's colour but I couldn't succeed. Is there a way to directly touch the alpha of the gradient points ?

I also tried to create a new Material using :

Code (CSharp):

1.     private Material newMat;
2. private Material newMat2;
3.  
4.     private void Start()
5.     {
6.         lineRenderer = GetComponent<LineRenderer>();
7.         StartCoroutine(Beam());
8.     }
9.  
10.     private IEnumerator Beam()
11.     {
12.         yield return customFrame;
13.         FrameNumber += 1;
14.         if (FrameNumber < 5)
15.             StartCoroutine(Beam());
16.         else
17.         {
18.             newMat = new Material(Shader.Find("Particle/Additive"));
19.             newMat2 = new Material(Shader.Find("Particle/Additive"));  
20.             newMat.mainTexture = ElectricShape;
21.             newMat2.mainTexture = ElectricShape2;
22.             lineRenderer.materials[0] = newMat;
23.             lineRenderer.materials[1] = newMat2;
24.             fadeOut = true;
25.         }
26.     }
27.  
28.     private void Update()
29.     {
30.         if(fadeOut)
31.         {
32.             alpha -= Time.deltaTime * fadeOutSpeed;
33.             lineRenderer.materials[0].SetColor("_TintColor", new Color(newMat.color.r,newMat.color.g, newMat.color.b ,alpha));
34.             lineRenderer.materials[1].SetColor("_TintColor", new Color(newMat.color.r,newMat.color.g, newMat.color.b ,alpha));
35.         }
36.     }

The problem is that I lose the "Shape" of the material... and the fade out doesn't work.

I am afraid that if I don't cree a new material, it will change the colour of all the object instantiated with the same material.

Thank you very much !

 

You should be able to just change the colour gradient its using: https://docs.unity3d.com/ScriptReference/LineRenderer-colorGradient.html

 

Thank you !

I just solved the problem using :

Code (CSharp):

1.            fadeOutSpeed += Time.deltaTime;
2.             Color m_color = Color.Lerp(new Color(0.5f, 0.5f, 0.5f , 0.5f), new Color(0f, 0f, 0f, 0f), fadeOutSpeed);
3.             Debug.Log(m_color);
4.             lineRenderer.materials[0].SetColor("_TintColor", m_color);
5.             lineRenderer.materials[1].SetColor("_TintColor", m_color);

I'll use your solution next time.

 

could you explain this to me, i understand how to fadeout a spriterenderer using materials but i don't understand how this works. thx in advance c:

 

Kind of a nerco I know, but if anyone wants an approach that uses colour gradients this is what I came up with:

Code (CSharp):

1. IEnumerator FadeLineRenderer ()
2.    {
3.         Gradient lineRendererGradient = new Gradient();
4.         float fadeSpeed = 3f;
5.         float timeElapsed = 0f;
6.         float alpha = 1f;
7.  
8.         while (timeElapsed < fadeSpeed)
9.         {
10.             alpha = Mathf.Lerp(1f, 0f, timeElapsed / fadeSpeed);
11.  
12.             lineRendererGradient.SetKeys
13.             (
14.                 lineRenderer.colorGradient.colorKeys,
15.                 new GradientAlphaKey[] { new GradientAlphaKey(alpha, 1f) }
16.             );
17.             lineRenderer.colorGradient = lineRendererGradient;
18.  
19.             timeElapsed += Time.deltaTime;
20.             yield return null;
21.         }
22.  
23.         Destroy(gameObject);
24.     }

- lineRenderer.colorGradient.colorKeys gets the current linerenderer gradient (ie, the one you've set in the inspector).
- If you don't want to destroy the linerenderer gameobject once its faded out you should set the gradients alpha value to 0 after the while loop instead.