Check out example codes for "change olour in unity script". It will help you in understanding the concepts better.
Code Example 1
SpriteRenderer sr;
void Start()
{
sr = GetComponent<SpriteRenderer>();
}
void Update()
{
//This is a simple way of adding color
sr.color = Color.red;
//This is a more specific way of adding color
sr.color = new Color(0/*Red*/,0/*Green*/,0/*Blue*/)
}
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