Fixed rotation is for when your actor is colliding with other actor , he's rotation will remain the same upon colliding . If you uncheck it (its unchecked by default for no specific reason) then your actor will start spinning when it hits (colliding) with different actors (imitating a "real world" physical collision).
You don't have to worry about the CPU/RAM usage for this , its the same if you check it or uncheck it .
Comments
If you uncheck it (its unchecked by default for no specific reason) then your actor will start spinning when it hits (colliding) with different actors (imitating a "real world" physical collision).
You don't have to worry about the CPU/RAM usage for this , its the same if you check it or uncheck it .
Cheers
Roy.