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Simple for loop issue

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I took your advice and am now using a list. It makes more sense in the long run :p. I generate the list with a while loop that exits once the variable gets to 100.

How am i setting the world matrix for the list? Cubes[x * z] gives me An error "cannot modify the return value of <stuff.Cube>.this[int] because it is not a variable. My code looks exactly the same as the one above, only the C is capitalized because I'm using the list now

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Your Cube is a struct (a value type), you can't modify its properties if you use [] of List<T>. That's why I said to use Add()
    Cube cube = new Cube();
    cube.World = Matrix.CreateTranslation(new Vector3(x, 0, z));
    cube.AtlasCoordinate = new Vector2(rand.Next(0, 2), rand.Next(0, 2));

or shorter:
    cubes.Add(new Cube()
            World = Matrix.CreateTranslation(new Vector3(x, 0, z)),
            AtlasCoordinate = new Vector2(rand.Next(0, 2), rand.Next(0, 2))

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