Levels and XP
Ta - Ta - Tarara! You just reached level 8!
Until now everything's been quite simple, right? Let's spice things up! One of the most frequently asked questions is how to implement a good Level/Experience system.
Preface
Do you want the player to get perk points he can spend on skills after completing tasks? Or do you prefer to have a common experience system where each level requires an ever-increasing amount of experience? Maybe you could increase the value of each stat depending on how much you make use of them.
There are countless ways of implementing a progression system. That's why we decided to let you choose what's the best way of doing it for your particular game.
But let's get down to business. The typical RPG progression system consists of a series of threshold levels of experience upon when reaching them, the level amount is increased by one.
Level & Experience
We'll need a couple of Stats to implement this system:
Experience Stat: When the player kills or completes quests, he'll increase the amount of experience points he has. These points will be used to determine the current level.
Level Stat: Depending on the amount of experience points the value will vary.
Notice that the Level Stat depends exclusively on the Experience Stat and it is perfectly fine.
The Experience Stat's formula is the same as the health one, which returns the current value of the stat using the this[value] expression. So if the player has accumulated 100 of experience points, the formula will return the same number.
What's interesting is the Level Formula, which uses the Progression Table.
Let's break down the previous expression. On the outer part we have table(...). This means that we get an output integer value depending on the input and the progression table defined at the bottom of the Formula object. The input for that table is stat[exp] which references the current amount of experience points.
On Level Up!
Right now we have a way to get the current level depending on the current amount of experience points. But knowing the current level is of no interest unless we can detect the exact moment in which our characters level up.
To do so, all we need to do is to create a Trigger object and use the Change Stat option, which detects when a stat changes its current value and fires the corresponding Actions or Events.
All that needs to be done then is to use the Instantiate Action with a prefab with some fancy particle effects on the player's position.
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