Material change on key down

Graphics Shaders & Materials
1

Hello everyone. I’m new to unity scripting and I’m trying to make a script which changes the game objects material on a key down and change back when you hit the key again. Now I was able to get the script to work correctly but I want it to fade from one texture to the other and that is where im having the problem.
This is the code that works on key down.

var startMaterial : Material;
var change2Material : Material;

function Update() {
if (Input.GetKey("m"))
	{
		if( renderer.sharedMaterial == startMaterial )
		renderer.sharedMaterial = change2Material;
	
		else
	
		renderer.sharedMaterial = startMaterial;
	}
	}

This is the code I’m trying to make the materials fade between each other and I’m not sure what im doing wrong.

var startMaterial : Material;
var change2Material : Material;
var duration = 3.0;

function Update() {
	if (Input.GetKey("m"))
		{
		renderer.sharedMaterial = change2Material;
		}
			else 
				{
				FadeOut ();
				}
}

function FadeOut ()
{
  for (t = 0.0; t < duration; t += Time.deltaTime) {
renderer.sharedMaterial = Material.Lerp (startMaterial, change2Material, t/duration);
    yield;
  }
}

I really would appreciate it if anyone could help me. I’m a artist not a programmer so forgive me if something in the script doesn’t look correct. I put this script together from a bunch of other scripts I seen on the forums.

2

Input.GetKeyDown() only returns true in the exact frame that the user presses the key. If you want it to transition while you hold the key, you probably want Input.GetKey()