Changing Vector3 components in C#

Hi,

I'm doing a couple of scripts in C# and I found something which looks kind of odd to me. I tried the following code:

Code (csharp):

1. mainTextBackground.transform.localScale.y = 0.1f*numberOfLines;

In C# it says that this is not possible... No problem, looked at the docs and there was an index access (i.e. [index]).

So I tried the following code:

Code (csharp):

1. mainTextBackground.transform.localScale[1] = 0.1f*numberOfLines;

But with the Debug.Log, I saw that the value isn't updating. If this isn't possible it should at least give me an compile error (maybe outdated mcs?).

I could only change a Vector3 with the following code:

Code (csharp):

1. mainTextBackground.transform.localScale = new Vector3( 1, 0.1f*numberOfLines, 1);

Is this expected behaviour?

Regards,
Afonso

 

That's what I ended up having to do as well. C# doesn't see the Vector3 as writable in any other way AFAICT.

 

This is because localScale is a property (and not a field) returning a value type. C# does not allow modifying struct members through a property. (Since structs are always passed by value, and therefore the property returns a copy of the vector.)

To work around this limitation, you have to read the value, modify it and assign it back:

Code (csharp):

1. Vector3 scale = mainTextBackground.transform.localScale;
2. scale.y =0.1f*numberOfLines;
3. mainTextBackground.transform.localScale=scale;