Loading external texture into secondary shader slot

I may have just missed this in my search so forgive me if it's elsewhere.

Does anyone know how to load an image into, for example, the bumpmap slot in a material using the Bumped Specular shader? In the docs all I could find was how to apply one to the main texture. Any clue? Or is this an impossibility with basic scripting? Below is my simple test script for applying a local external texture, as an example. It works fine but I'd also like to swap out the normal map too somehow.

Code (csharp):

1.  
2. var url = "file://load_texture_diff.png";
3.  
4. function Update () {
5.    
6.     if (Input.GetButton ("Fire2")){
7.    
8.    
9.     renderer.material.mainTexture = new Texture2D(1024, 1024);
10.  
11.  
12.     new WWW(url).LoadImageIntoTexture(renderer.material.mainTexture);
13.  
14.     }
15.  
16.  
17. }
18.  
19.  

Thanks.

 

mainTexture is a shortcut for SetTexture("_MainTex", someTexture); So if you want to replace something other than _MainTex, you'd look in the shader to see what it's called. Bumpmaps are usually, as you might expect, called "_BumpMap".

--Eric

 

Thanks, Eric. Yeah I saw that in the docs right after posting, of course. I'll update with my results in case anyone else does a forum search and runs across this thread.

 

Ok, I just tried this

Code (csharp):

1.  
2.  
3. var url = "file://load_texture_norm.png";
4.  
5.  
6. function Update () {
7.    
8.     var bumpMap : Texture;
9.    
10.     if (Input.GetButton ("Fire2")){
11.    
12.     renderer.material.SetTexture("_BumpMap", bumpMap) = new Texture2D(1024, 1024);
13.  
14.  
15.     new WWW(url).LoadImageIntoTexture(renderer.material.SetTexture("_BumpMap", bumpMap));
16.  
17.     }
18.  
19.  
20. }
21.  

and I am getting errors:

Code (csharp):

1. "Assets/LoadBump.js(13) error BCE0049: Expression cannot be assigned to."

and

Code (csharp):

1. "Assets/LoadBump.js(15) error BCE0017: The best overload for the method 'UnityEngine.WWW.LoadImageIntoTexture(UnityEngine.Texture2D)' is not compatible with the argument list '(void)'."

What am I doing wrong here?

 

You have the right idea, but mostly you're just getting the order a bit wrong. Also, I know the docs say that using .mainTexture is "the same" as using Get/SetTexture with a _MainTex name, but it's actually a reference to that texture. Whereas SetTexture is a function that performs an action and doesn't return anything ("void"), not a refererence to the texture. Hence the error message...understandable confusion but it will all make sense eventually.

Code (csharp):

1. var url = "file://load_texture_norm.png";
2.  
3. function Update () {
4.     if (Input.GetButton ("Fire2")) {
5.         var bumpMap = new Texture2D(1024, 1024);
6.         new WWW(url).LoadImageIntoTexture(bumpMap);
7.         renderer.material.SetTexture("_BumpMap", bumpMap);
8.     }
9. }

Also you probably want GetButtonDown rather than GetButton.

--Eric

 

Ah, many thanks Eric. It's starting to come together for me.