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As we continue to learn about sketching, I want to take a minute to talk a little bit about the origin geometry. Because the origin geometry is something you will interact with with every single part you will create and is essentially the center of the universe for every sketch, part and assembly you are going to create. I'll start out by creating a new part file, by selecting the New button on the tool bar, selecting standard.ipt, and then hitting Create. What this is going to do is create a blank part file, but it's not entirely blank. The one component that is always going to be in every part file are the set of origin geometry.
Origin geometry is found in the browser, in the origin folder, and if you click the plus symbol next to it, you can expand and see all the geometry that make up the actual origin. By default, the origin geometry is turned off. Essentially, it's a set of planes that intersect to create axes, which intersect to create a central point that is fixed in space, so that you can use that as reference throughout all your designs. To make them visible, I'm going to go ahead and select the top one, the yz plane, then I'm going to hold my shift key down on my keyboard.
I'm going to left click on the center point and select all the geometry. I can then right click and select Visibility to enable that geometry. Now, I'm going to show you what the geometry is and how to use it. But most of the time, Inventor is going to use that geometry as needed. It's going to enable it and disable it at the beginning of every single part, just so you can get started sketching. But as I orbit, you can start to see how these planes interact. If I hover over each of these planes in the browser, you'll see them highlight in the graphics window.
And essentially what you see here is planes that intersect to create each of these axes, which then creates the center point. And that center point's important because it is the center of the universe. It's the central point that will never move, and by default in Inventor, it's projected to every single sketch so that you have a locked point that you can design from. That comes in really handy when you're changing the size and shape of models to know that they're going to move or scale from that location. And you'll see what I mean as we get through sketching and part modelling throughout this course.
But it's important to understand where the geometry is and how it's used. Now that you see where the geometry's located, I'm going to go ahead and turn that, the visibility of these geometry components off by right clicking on them and selecting Visibility. And show you how Inventor helps enable and disable those as you need them. In order to create a new part, you need to create a base feature. And in order to create that base feature which is essentially the very first feature you ever create in a part, you need a flat surface to draw on. The origin geometry provides that for you.
If I create a new sketch, you'll notice that in the browser the origin geometry now has color. Which means they're all visible, and you can see them on the Graphics window. In order to begin sketching, I simply need to select one of these planes to sketch on. And Inventor will create a new sketch on that plane and rotate me into a normal view so that I can actually begin sketching. If I create a two-point rectangle on the sketch and finish, Inventor will return me to my Isometric view. And it disables all the origin geometry again.
Now, if I hover over this xy plane, you can see that it, the geometry I just created is sitting right on that plane. I can always go back and use that geometry again if I wish. But, in most cases with Inventor, you're going to go ahead and apply a modeling action to that 2D shape. And from that point forward, you're generally going to use faces on the model to create new sketches. For example, the second sketch I create will not turn on the geometry, but instead, allow me to select faces on the model to create that new sketch.
It doesn't mean I can't go back and use the geometry if I wish. For example, if I needed to, I can always go back to my xy plane, select it, and actually create a sketch on it. But, in most cases, once you've started building a model, you'll use faces on the part to generate sketches. There are times when you're building models in more advanced assemblies where you may use the origin geometry as your fixed location in space to refer to a location in a building or in a machine as reference.
But for the most part, the origin geometry is going to be used to create that initial base feature that you need to create in every single part.
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