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Class Variables: Introduction to Variables With Multiple Sub-Variables in Unity 3D

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In Unity 3D creating variables is quite easy:

public int someValue = 1;

It will be shown like this in the Inspector view:

But what if you want to have multiple sub-variables in one single variable like this?

This approach is useful when you need to organize the Inspector view or have multiple variables attributed to a single element.

  • To make the variable with multiple sub-variables we need to use a nested class. Check the code below:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SC_ClassVariables : MonoBehaviour
{
    [System.Serializable]
    public class VariableGroup
    {
        public Transform t;
        public int someValue = 1;
        public bool someBool = false;
    }

    public VariableGroup variableGroup;
}
  • The script above defines a class called VariableGroup
  • The class VariableGroup contains multiple sub-variables
  • Note the [System.Serializable] before the class. This attribute is needed to be able to edit its variables in the inspector view.
  • And lastly, the variable variableGroup is defined, which uses the VariableGroup class.

The class values are accessed by calling the variable name followed by a dot then a child variable name:

variableGroup.t
variableGroup.someValue
variableGroup.someBool

The class above can also be used in array:

public VariableGroup[] variableGroup;