LED Matrix animation editor

That is a nice looking app. Can you clarify it for me?

It seems that this "animates" things by creating individual frames on a development PC, generating source code for a series of constants in an Arduino sketch.

That is in comparison to generating code in the loop() function that changes a starting frame "on the fly" while the sketch is running on an Arduino.

Both methods will give the same visual result, of course. I just want to understand it more completely.

Thanks