Old Lessons are easy to forget, example #352. OnTriggerEnter.

I was working on a script similar to one that I wrote and misplaced long ago, and had to relearn the Rigidbody requirement. Why oh why can't a trigger detect a collider without a Rigidbody?

Code (CSharp):

1.         void OnTriggerEnter(Collider collider)
2.         {
3.             //
4.             // Hey, not detecting a collider you thought it should?
5.             // Unity Physics requires both parties to have Rigidbody
6.             // and collisions enabled between their layer and our layer.
7.             // Also, the Physics option for allowing kinematic-kinematic
8.             // or kinematic-static collisions may be required.
9.             //
10.  

Reminder comments for lessons re-learned are better than nothing. I better not lose this script too.

What's your oh-yeah-I-keep-forgetting "feature" of Unity?

 

The gotcha I relearned approximately three times: That

Input.GetKeyDown

will only give True reliably in the Update() method (or a Coroutine), but not in FixedUpdate because it's bound to frames.

 

some months ago, i started making a scrivener project where i can categorizes stuff like this - basically like creating my own documentation sort of. Mostly it's just short notes and links. Lots of code snippets.

I keep it in a git repo too so it's not just local.

there is a million apps you could use for something like this but i liked scrivener because it has robust search features, organization features, and great ergonomics (like you can navigate whole thing easily using keyboard only)