Random colours from a list

Unity Engine
,
1

Hi everyone,

New to Unity and C#, I have been breaking my head over the following for the last 3 hours.
I am trying to assign a random colour to a renderer by using a list (as I want to delete colours from it in a later stage, as well as make sure all the colours are being used).

I have the following code but it gives me an error on the last line. Any ideas?

    private SpriteRenderer sr;
    public List<Color[]> coloursList = new List<Color[]>();

void Start()
    {
        Color[] array1 = new [] { Color.red, Color.blue, Color.green };
        coloursList.Add(array1);
        sr = GetComponent<SpriteRenderer>();
        int rand = Random.Range(0, coloursList.Count);
        sr.material.color = coloursList[rand];
    }
2

Line 7 above doesn’t do what you think it does, it just adds a single element which itself is a fixed array of colours.

I think you meant something along these lines:

    private SpriteRenderer sr;
    public List<Color> coloursList;

    void Start()
    {
        coloursList = new List<Color>() { Color.red, Color.blue, Color.green };

        sr = GetComponent<SpriteRenderer>();
        int rand = Random.Range(0, coloursList.Count);
        sr.material.color = coloursList[rand];
    }

… or …

    private SpriteRenderer sr;
    public List<Color> coloursList = new List<Color>();

    void Start()
    {
        coloursList.Add(Color.red);
        coloursList.Add(Color.blue);
        coloursList.Add(Color.green);
 
        sr = GetComponent<SpriteRenderer>();
        int rand = Random.Range(0, coloursList.Count);
        sr.material.color = coloursList[rand];
    }
2 Likes
3

Thanks a lot!

How would I go about deleting the chosen colour from this list?
When I add
coloursList.Remove([rand]);
it gives me an error…

4

Because it’s against the syntax. What you do think you’re achieving with symbols?
You need to learn about the basics first, learn C# syntax and what the symbols mean.

5

I have put these in as I wanted to get the index of rand to be deleted from the list. Not having these would give me the error that rand is an int and not a colour. Going through documentation for hours have not helped me so far, as has your comment. I understand these beginner question must tire you, but you do not need to respond.

I am sorry I can’t seem to be able to figure it out from this https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1.remove?redirectedfrom=MSDN&view=net-7.0#System_Collections_Generic_List_1_Remove__0_

6

https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1?view=net-7.0
Look at the other methods available on List.
Hint: Anything else starting with “Remove”

7

Thank you!

8

It’s to push you into right direction. If I write the solution for you, you’re likely to never learn or remember anything. We’re not supposed to be machines that spit out solutions on this forum. I am not paid to do this.

Btw, I/we have told you everything you’re supposed to know. GO LEARN C#. There is a vast sea of tutorials and Microsoft’s own knowledge compendiums out there. FOR FREE.

1 Like
9

If you’re looking for the index of the variable rand, there’s a method for that :wink:
Check the arguments/parameters that methods require, RemoveAt() needs an int, so you need to determine the index first, or you can do it in the argument itself (nesting methods).