Converting Color value into a variable

Unity Engine
1

Hey anyone and everyone.

I’m currently working on a game with a stealth mechanic. I’ve found a great post on these forums with an example project that explains how to grab a color value from a lightmap based on my player’s position.
Post: http://forum.unity3d.com/viewtopic.php?t=8452&sid=f6a1d715a0542746b5514feeeeb0f490

This example script modifies the material.color of an object. I’d like to take the value of the pixel grabbed and convert it into a variable I can check later. Unfortunately, once the color is defined as RGBA(1,1,1,1) I can’t seem to figure out how to convert it or check it. Any information that can point me in the right direction would be awesome.

2

Could you please specify the code that you are talking about. Maybe I’ll be able to help you out after wards.

thanks,

3

Sure thing! This is the code snippet from that project. The important stuff I’m trying to do is near the bottom.

var rayDistance : float = 2;
var layerMask : LayerMask;
private var myTransform : Transform;
private var hit : RaycastHit;

function Start() {
	myTransform = transform;
}

function Update() {
	// See if ray hits anything some distance below
	if (!Physics.Raycast(myTransform.position, -Vector3.up, hit, rayDistance, layerMask.value)) {
		return;
	}
	
	// Just in case, also make sure the collider also has a renderer material and texture. Also we should ignore primitive colliders.
	var rend : Renderer = hit.collider.renderer;
	var meshCollider = hit.collider as MeshCollider;
	if (rend == null || rend.sharedMaterial == null || rend.sharedMaterial.mainTexture == null || meshCollider == null) {
		return;
	}
	
	// Get lightmap color, and apply to object 
	var tex : Texture2D = rend.material.GetTexture("_LightMap");
	if (tex.format == TextureFormat.RGB24 || tex.format == TextureFormat.ARGB32) 
	{
		var pixelUV = hit.textureCoord2;
		renderer.material.color = tex.GetPixel(pixelUV.x * tex.width, pixelUV.y * tex.height);

// here's what I want it to do that doesn't work. 
// 1. Convert the color value to a variable.		
		var illumination = renderer.material.color;

// 2. check the variable for fun and games

if (illumination > 0.5)
{
print ("awesome");
}
		
		
		
	}
}

Hope this helps. Thanks for input!

4

Hi,

In your code, what does the 0.5 stands for?

// here's what I want it to do that doesn't work. 
// 1. Convert the color value to a variable.       
      var illumination = renderer.material.color; 

// 2. check the variable for fun and games 

if (illumination > 0.5) 
{ 
print ("awesome"); 
} 
       
       
       
   } 
}

First thing is that the name of your variable isn’t intuitive. You should choose a name that is obvious to figure out what type of variable or what it’s suppose to do. Also, I know that Javascript allows you to create a type of variable without necessaraly indicating the type. But I like my code to be clear so I would suggest you to write your variable like so:

var illuminationColor : Color = renderer.material.color;

If you want to change either r, g, b or a, you need to specify it by adding ‘.’ plus the letter to your color variable.

example: illumination.r = 0.5; or illumination.a = 0.23 and so on.

Also, I found this link that explains how you can play with the RGB. (It’s not on topic but I thought you would like this.
http://www.unifycommunity.com/wiki/index.php?title=RGB_values_via_script)

5

Horray! This works great! Thank you very much maparizeau. I think I’m going to start specifying type in order to help me learn from now on.