GetInstanceId() behavior on different platforms - need dev confirmation.

I stumbled across something interesting trying to get rid of "Destroying assets is not permitted to avoid data loss." errors.

Since I couldn't use AssetDatabase.Contains() at runtime to check if a given material is an asset or not, I searched for other ways to distinguish. That's when I discovered that GetInstanceId() returns a negative value for materials that were created using "= new Material(...)" and positive values for materials that were in fact assets.

That's why I need confirmation from the Unity devs:

Is this intended behavior? Is it safe to assume that GetInstanceId() will return negative values on every platform for code created materials? Might this change in the future?

Thanks in advance,

delstrega

 

Hi,

yes, this is intended behaviour, and yes the same behaviour is on other platforms aswell.

I very doubt it, as this is in the very core of the code. But you never know

 

Great! This makes eliminating leaks sooo much easier ;D Thanks Tct!