Question Multiple Sources of gravity.

You can click planets around the screen, which pull the player towards them. I want there to be multiple planets, which all work in harmony. I am relatively new to Unity, and have literally no idea how to implement these features. From basic knowledge acquired by coding some of the basics, and by Googling questions I had, I tried coding the embedded script. It didn't work, and Googling some of the basics only led me to 3D answers or videos/threads that had the question all wrong!



(Admittedly, a lot of this code was from Google)
(Before anyone says anything, yes the file was renamed from GravitationalPull to GravitySimulator)

This script is applied to the prefab of the planet. By the way, I already have the system of clicking and planets appearing down. Also had no idea about that, but Google led me to a good answer relatively quickly.

Both Scripts: https://github.com/TheSuperFastOne/SecondLearningProject

Screenshots:

https://ibb.co/album/jJByLm


Truly hope these resources are sufficient.


Help would be most appreciated!

 

Coupla things... I think your gravitational attraction computation is off... formally it goes as one over radius squared.

https://en.wikipedia.org/wiki/Newton's_law_of_universal_gravitation

After you fix that, time to avoid doing GameObject.Find() and GetComponent in Update(), but you can save that step until you get the attraction math working. Try it with two objects and the player.

 

What Melv is saying is, use FixedUpdate() for all physics / physics2D purposes.

Here is some timing diagram help:

https://docs.unity3d.com/Manual/ExecutionOrder.html

Two good discussions on Update() vs FixedUpdate() timing:

https://jacksondunstan.com/articles/4824

https://johnaustin.io/articles/2019/fix-your-unity-timestep

 

Wow, thanks so much! I was getting completely incorrect information on this!