Space Shooter Day 7

Today I work on the script for the asteroid I was able to make it moving downward or falling like an asteroid should however at first I discover that the asteroid continue to move downward forever therefore I have to write a conditional statement to make the asteroid re appear at the top of the screen.

then I start to think about to to make all the object actually interact with each other. In this case we will need a collision. In Unity you can add rigid body to a game object to give that put object under control of physic to give an object a more realistic movement.

Rigid body option

Here we have Gravity unchecked because we don't want our object to be affected by gravity, but instead use the transform or movement information we input in the code. so we switch it to kinematic instead. 

so I have that set up for all the game object so that so they will be able to interact later. 

Problem encounter: Forgetting to apply new changes 

So because I  make all object into prefab before making adjustment so I didn't know that when you make changes to it it doesn't change the original prefab sooooo when I close my work and come back to it the changes was never made... so I have to go back and re adjust everything. Luckily it wasn't much but now I learn 

see the apply button 

 Now I'm hitting apply like every 5 minute even if I didn't change anything >. > just to be save.