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hey what's up Jason you're from unity3d college in this video I'm going to show you how to load and save data for your game so I've got a simple scene set up here with some cubes that I can click on to change the color and if I stop playing and start playing you'll see that the colors come back exactly as I had clicked now I'm switch on like just the red in the right corner stop and play one more time and when we restart you'll see that that data has saved off so let me show you how I save this stuff off the first thing I want to do is take a look at our scene so here you see we have a game data controller object with a single script on it nothing else so you can really see there then I've got these five cubes the cubes are all really simple they just have a magic cube script on them the checks for a ray cast in fact let's open it up here we do a check to see if I click if I click we do array we do a ray cast from that Ray with this Collider if we clicked on it we switch the is read property to be opposite of what it is so if it's not read it'll become read if it isn't if it is read it'll become not read and then call an update color that just updates the material based on whether or not it's read and then finally we see down here we call into the game data controller and tell it to set the state of this object so here I'm passing in the object in the state that I want to use you also notice that in start I'm setting this again or I'm pulling it from the game data controller and just saying game data controller to get state and passing this object in getting back the is read value and then again updating the color that's how it's kind of loading and unloading but let's took it take a look at the details of how this loading and unloading actually works so in the set state well actually let's let's start up above in a wake of our game data controller we load our data and now to load the data a lot of time we'll use player prefs sometimes we'll write out to a file in this case what I wanted to show was how to do it with a JSON serialization so you could swap this in with binary serialization or any other serializer that you want but this is just using the built in default serializer so what I do here in the savegame we take this saved data object you can see that's defined right up here we serialized out to a string and then shove that into game data and then in load data we pull that string out of this game data player pref object and then we deserialize it using JSON utility dot from Jason and passing in that data we'll get back this save data object so let's take a look at the save data object and they don't want to step through this and just kind of show it in action to break down how everything's working a little bit more so the save data object is actually struct in fact if you look in the file it's actually two structs so we have an initial structure that has some kind of generic know the normal types of things that you might see in a game maybe current health the level that you've beat any other data that you would have that's more generic and like there's one of in the scene it's just or one of in your game I guess this is one instance of it here but then I also have a list of this magic cube data and if you look down here you'll see that's another struct with an ID that's actually a string and in this case we're just shoving the name in there and then a boolean for whether or not the thing is red so when we save this off we're actually saving off this list of cubes as well as the base data here and you're going to see that in just a moment it's important to note that we're not using a dictionary here and the reason for that is that the built-in serialization doesn't support dictionaries if you want to use dictionaries in your data you just need to switch over to something like JSON net which I usually recommend but it's not free in here so I didn't want to use that as the demo I want to show that you can still do this kind of thing without using a dictionary to need so let's uh attach real quick and we're gonna step through the code just gonna watch what's happening so let's see I'm gonna start in load data add a breakpoint here and I'm gonna stop playing and restart playing we should hit the breakpoint kind of step through and see how this is working all right there we go we've hit the breakpoint so the first thing to see if I hit f10 to step over this this data string is filled up with all of this text and if I hit the little button here I'm gonna pop it over and see and you see it's just a JSON serialized string with current health set to zero last level beat set to zero and then our list of cubes is right here so here you can see I D is actually just the name of the cube right now and then we have the true or false state for whether or not it's red now when I call when I look at save data if I expand this out you'll see that right now it's empty we haven't executed this line so there's no health no level beat in magic cubes as no when I hit f10 one more time and let it do the D serialization all of a sudden you'll see that these still are 0 because I never put any data in there but the magic cubes this is all filled out so now when I call in to my checks against this data here so that's right here and get state I'll be able to see the state of these objects so let's put another breakpoint here and get state and see what happens I'm gonna hit f5 so here we're getting called let's go up the call stack real quick we're getting called from a magic cubes start and here we're passing in the magic cube this is cube 4 and we're just trying to figure out if it's red let's go back in here so first thing we do is just check to make sure that magic cubes is actually initialized if it's no we don't have any data for it so we're returning back the false or the default this shouldn't really happen but it's good to have there have it as a check in case something blows up and goes really bad the next thing you do is check to see if there are any magic cubes with an ID equal to this magic cubes name if there are I get the first one and return back the is read property now this won't catch a case where we have a multiple of the same name of an object this could be an issue the ID should really be something unique in this case I used the name because it was simple and I didn't want to dive into building up a unique identifier but you could definitely do something like that just create a unique ID and keep track of it you need to make sure that when you clone or duplicate the objects though that that unique ID is still unique so you want to have some extra checks in there for that but using the name if the name is unique is also gonna be fine it was definitely in this case that's totally fine so here we return back out a value and that value was false and then if I hit a 5 you'll see we get it again and four times or five four more times there we go we've got it all five times now let me show you the saving part and can wrap this up so I'm gonna just check that one cube and uncheck these two and I'm going to stop playing but first I want to put a break point so in on disable this is how I'm saving I also have a right-click menu option by the way to save so if I go right here right click and save data you can see it'll save to actually let's uh yeah whatever let's just stop playing hit the save and step through so here we go we stop we hit save game now we have our save data object if I expand this out you see magic cubes only one of these is set to true by the way the reason I can see this data can a format it this way is I use an extension for visual studio called oz code it's really awesome I love it and it makes this kind of stuff nice and simple so I can kind of expand and check the or star the things that I care about and want to see in the list and then those just show up there it's it's really awesome definitely worth trying out if you have a free trial anyway you can see here that is red is only true for cube 3 right in this in this data actually I'm gonna load it and we're gonna get the same exact thinks I already loaded at once but here let's look at the string data one more time so here's all that data and if I went in and changed this by the way right now at this breakpoint we would it wouldn't matter at all would it yeah what yeah because we would serialize out the other save data sorry he's getting myself a little confused here but you can see this is the string and then we call player press set string it saved it off and that was the serialized version of this thing I'm sorry I got a little rambling there at the end and ausco just kind of is awesome and gets me a little bit distracted but I think this kind of covers the the basics again on your saved data object or whatever you want to call it make sure that you have it marked serializable and then any other class that you're going to serialize underneath it like this magic cube data is also serializable if you run into issues with things not serializing it's probably just the type that's not supported by the built-in serializer I highly recommend JSON bet net there's an asset store plugin there may be a free version of it out there too now it's definitely worth trying though it kind of simplifies that stuff even more if you need it if you don't need it you just want to save basic data this will totally work now just to kind of wrap this up the other thing that you could do is binary serialized this data instead of JSON so if you don't want people to be able to go in and load your data and modify it and change it binary serialization will make that a bit harder so it's not just plain text readable in the registry or wherever else depending on the device personally I usually don't really care about it because if we're not securing something important it doesn't really matter I don't care if a player hacks my mobile game or not but if it's something important yeah consider that don't just drop it all into text then the same would be said with just using player preps that again just writes it out as plain text and it's a little bit less secure I guess anyway I think again sorry I keep rambling I think this is good we've got the basics down if you have questions about this stuff or want to do some other serialization or save some other kind of data that this doesn't work with or you're just not quite sure how to hook it up with your system feel free to drop a comment below or drop me a message on the Facebook group or an email and I'll be happy to get back to you alright thanks for watching don't forget to Like subscribe and share with all your friends and all this stuff thanks