texture at runtime: how to create and attach it

Unity Engine
1

Hello everybody,

I have an OBJ file which is my 3D model I upload at runtime. Now, I want to attach a Texture as soon as it is loaded up. So, I thought that calling

gObj.AddComponent(Material) would be helpful but apparently I can’t do it as Material doesn’t derive from Component. So, I decided to create a separate script, and call
gObj.AddComponent(MyScriptForTexture);

and modify the Start() function in a way to load the texture and attach it… but I can’t find the way to load a texture from a file. :frowning:

Any help or simple example?

Regards,
Giancarlo

2

You can’t directly add a Material via that method. If you’re talking about creating a Material from scratch via code then check out this:
http://unity3d.com/support/documentation/ScriptReference/Material.html

Then attach it via renderer.material:
http://unity3d.com/support/documentation/ScriptReference/Renderer.html

This will also allow you to manipulate the properties of the material on the fly - such as fading between 2 diffuse colors for example.

3

Well it’s weird because the script I attached at runtimes the Start function is:

renderer.material.color = Color.red;

and nothing happens :frowning:

4

Is there a Mesh Renderer component on your GameObject?

5

then you are on the wrong renderer or a material that does not use colors

6

As you say, the material is not actually a component. If your object is a Unity prefab then you can change its texture using:-

renderer.material.mainTexture = newTexture;

If you are constructing the mesh yourself directly from the OBJ data then you need to add a MeshRenderer component to the object before using the renderer property in code.

7

Uhm… my OBJ data has a MeshRenderer already. yes. And then… I call a new script, MyScript.js, where in the Awake() I’ve put that

renderer.material.color = Color.red;

if my GameObject is called obj I called

obj.AddComponent(MyScript) where my script is the Standard Asset folder of my project.

Nothing happens :frowning:

8

How are you calling the script if it’s not attached to the GameObject you’re trying to manipulate?

9

UHm now I’m confused…
the script that allocates my object calls:

gObj.AddComponent(myScript);

in MyScript.js in the Awake() function I call:

function Awake() {
Debug.Log(“Room Texture Loaded”);
renderer.material.color = Color.red;

}

I thought that once the Object is rendered and the call to Awake is automatic. Isn’t it?

10

Weird… so I moved that line into the Update function and I’ve found that it worked. … I don’t understand why tho.

and moreover as my geometry is a room with detached walls… not all the geometry has been coloured but only the pieces attached to each other.