Color.r

Красный компонент цвета.

Значение варьируется от 0 до 1.

//Attach this script to a GameObject with a Renderer attached to it
//Use the sliders in Play Mode to change the Color of the GameObject's Material

using UnityEngine;

public class Example : MonoBehaviour
{
    Renderer m_Renderer;
    //Set the Color to white to start off
    public Color color = Color.white;

    void Start()
    {
        //Fetch the Renderer of the GameObject
        m_Renderer = GetComponent<Renderer>();
    }

    private void OnGUI()
    {
        //Sliders for the red, green and blue components of the Color
        color.r = GUI.HorizontalSlider(new Rect(0, 00, 100, 30), color.r, 0, 1);
        color.g = GUI.HorizontalSlider(new Rect(0, 40, 100, 30), color.g, 0, 1);
        color.b = GUI.HorizontalSlider(new Rect(0, 80, 100, 30), color.b, 0, 1);

        //Set the Color of the GameObject's Material to the new Color
        m_Renderer.material.color = color;
    }
}