Unity Game Optimization - Third Edition

Caching component references

Repeatedly recalculating a value is a common mistake when scripting in Unity, and particularly when it comes to the GetComponent() method. For example, the following script code is trying to check a creature's health value, and if its health goes below 0, it will disable a series of components to prepare it for a death animation:

void TakeDamage() {  Rigidbody rigidbody = GetComponent<Rigidbody>();  Collider collider = GetComponent<Collider>();  AIControllerComponent ai = GetComponent<AIControllerComponent>();  Animator anim = GetComponent<Animator>();  if (GetComponent<HealthComponent>().health < 0) {    rigidbody.enabled = false;    collider.enabled = false;    ai.enabled = false;    anim.SetTrigger("death");  }}

Each time this ...