So we've already looked at cloning and this is the File that's left over from that lesson. And we saw some grouping with the cloning and so we have a better idea of how to work with objects and take one simple object and propagate it throughout a scene and organize it and transform it into whatever position we need it to be in. Now I want to talk about Instances. And the reason why we need to talk about Instances is because when you clone an object, you are creating a geometrical copy and that geometrical copy takes up a certain amount of processing power and memory in the file as well as in the rendering. Because of that, it really is not the most efficient way overdoing things. Instances is much more efficient because you only have to have one copy of the object and then everything else is basically just a record of where the object has been copied to. So Instances are way more efficient in terms of rendering memory overhead and you want to use them whenever possible for that reason. However, they are a little bit quirky to work with in the sense that you can't group Instances and you can't clone Instances so once something is an Instance that's what it is, and that's the only way that you can work with it. So let's go ahead and get started on this lesson by going up to File, Library, Objects, Primitives and we're going to grab the cylinder. I'm going to Hit Import, we can't see that cylinder right now, it's buried underneath all of our objects. So I'm going to go ahead and click on this first icon here, this yellow icon, and I'm going to click on my first widget here, to make sure I've got my move widget selected and I'm going to click on the cylinder in my Objects List. Now I'm going to go ahead and just click on the blue arrow here and just pull this guy up until it looks about good, I think maybe a negative 6 is probably going to be just fine for what we're looking for here. And the other thing I want to do is I want to grab the Transform widget and I want to pull up on the grid until it looks good and that looks like about 5 so 5 looks good, I feel pretty good about that. So now we have our original object set-up and ready to go and I'm just going to move back to my move widget here. This is an actual object, it has real geometry and if we make a clone of this we're going to have several pieces of real geometry that we don't really want, so we're going to make Instances of this instead. Before we do that what we want to do is want to just go ahead and Hit Reset to sort of bake these changes in, so I'm going to Hit Reset. Now you'll notice that our Scale is no longer set to 5 and our position's back to zero zero and all of our transformations are going to happen around that enter of the world system which is exactly the way we want it be because we're going to create a circle of columns around this stack of balls. So what I want to do is, I want to create some Instances and in order to do that if we context click on this cylinder you'll see that we have a keyboard shortcut assigned for Ctrl- Alt -Shift and I, so what I want to do is I'm just going to click on this guy so that we have it selected and then I'm going hold down Ctrl ÐAlt- Shift and I'm going to Hit I seven times, 1, 2, 3,4,5,6,7. And now if we go under our Instances Tab, you'll see that we have 7 Instances ready to go and waiting for us. So these Instances in order to be able see them and work with them what we need to do is we need to go over to either Edit, Preferences or we need to go to this Gear Icon and open up our Preferences and go to Instances. And we need to set our settings the way you see them here, set it for ALL, Shaded, and Display Proxy 100 percent. Now these other two are probably pretty obvious to you but the Display Proxy, what it does is that when you have many, many Instances, what it tries to do is, it tries to figure out just a few sample instances that it can show you in order to keep the memory usage down on your Viewport as you're rotating and stuff like this. However the problem is, is that you can't see everything, so you don't know where everything is because of the way we're working right now, I want to see everything, by setting it to 100 we guarantee that we're going to see everything, I'm going to Hit OK. We don't need to restart for that to take effect it will take effect immediately. What we need to do now is we need to go to this blue icon at the very end which is our Instance selector icon, we need to click on that and then we need to click on our first Instance in the List here, now if you aren't seeing this list, the reason why you didn't see it is because you don't have your cylinder selected. But as long as you have your cylinder selected all the Instances will be available to you. So I'm going to click on the first one and I'm going to use my Rotate widget like so, what I want to do is I want to rotate on the green so we're just going to go ahead and click on the green and we're going to pull off, and you can see here that we're actually going in a negative direction. And because we have 8 of these I know that we're going to be working in 45 degree increments, so I'm just going to go ahead, negative 45 and hit tab to put that one in and then I'll just do negative 90 and hit tab and then I'll move to this one and do negative 135 and then hit tab. And then once we get to 180 we're actually going to flip to positive so we're just going to go ahead and hit 180 and tab, and this one would be a 135 tab, this one would be 90 tab, and this last one would be 45 tab. So there we go, now we have our Instances all around. Then you may ask yourself, well what else can we do with Instances, since this seems like it's a pretty straight forward thing? Well we can have different materials applied to these Instances which we'll get into in a little while, but one of the really cool things about Instances is that when we do anything to our original cylinder, whatever we do our original cylinder is going to be propagated throughout all of our Instances. So let me just go ahead and navigate down so we can see this a little bit better. What I want to do is I want to go ahead and lower the height of my cylinder a little bit, so I'm going to go back over here to my Object Selector and I'm going to grab my Scale widget, and what I'm going to do now is I'm just going to go ahead and drop the scale on the green until it gets to be something like .75, that looks good. So that in and of itself doesn't look like it had to change to everything else that we want, well in order to make that change propagate throughout all of our Instances, what we need to do now is we need to Hit Reset. And now you see all of our Instances have been propagated with that particular look. Now again, because of the way we have our proxy set up to show, this looks just like regular geometry however if we go back up to our Preferences, and we change it from say Shaded to Wire and Hit OK, now you'll see what we really have. We have one real object and we have our 7 Instances. Generally speaking, for my purposes, I prefer to leave it at Shaded and just go ahead and let it be what it is, if you notice any kind of slow down you might want to change it to something like Bounding box or have them hidden unless you're working with the object that they're made from.
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