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In this video we're going to focus on the origin geometry. In the previous video, you watch me create a few basic features, and you may have noticed the Origin planes being used to start each part. The Origin is essentially the center of the universe within any part or assembly. And while it's called the Origin, it's actually made up of three planes and three axes that all intersect at a center point. I'm going to start a blank part file so that we can better understand the origin geometry. When creating a new part, the very first feature is always going to be a sketched feature.
And in order to create that sketch you need a flat surface. But in a brand-new part file, there are no flat surfaces and the origin geometry provides that drawing surface. The Origin can be found in the browser under the Origin folder, and when you expand it, you can actually see the three planes and three axes, and the Center Point that make up the Origin. Now by default the origin geometry is not visible. I'm going to rotate into a home view isometric and make those visible so that you can better understand where they are and how they work.
To turn on the visibility of a plane or an axis, or any of the origin geometry, simply right-click on it in the browser and select Visibility. You can also use standard Windows selection convention, such as selecting an item further down the list to gather a group of items. But once they're selected, you can right-click and select Visibility to enable them all at once. Now as I rotate, I think you'll get a better view of how these planes interact. If I hover over one of the planes in the browser, you'll see it highlight in the graphics window just like you would in any other part or assembly within Inventor.
Again, the browser is linked to what you see in the graphics window. As I hover down, you can see the XZ Plane is now highlighted, and here's the XY Plane. The axes are actually the intersection between two of the Origin planes. The X-axis, for example, is the intersection of the XY Plane and the XZ Plane. The Y-axis is an intersection of the XY Plane and the YZ Plane. Now that we know what the origin geometry is, I'm going to go ahead and turn it off--or make it not visible again--by selecting each of the items and unchecking Visibility from the right-click menu.
The reason I'm doing this is because in Autodesk Inventor 2013, a new feature was added that makes it less important to turn on and off the visibility of the origin geometry. When you're creating a sketch, the system now temporarily makes visible the origin geometry so that you can select your sketching plane, and it will automatically hide those items-- or return them to their hidden state-- after you've made your selection. So here I'm in the Create Sketch command. You'll notice in the browser that these items are visible, they're highlighted, they have color to them, and I can simply select one of the planes in the window to create my first sketch.
And you'll notice that the origin geometry in the browser has been returned to its hidden state. Now I'm going to go ahead and create a rectangle and extrude that to show you how to move forward from here. You'll notice, again, in the browser the origin geometry is all hidden. I can go ahead and collapse that, because after I've created my base feature, my first feature of my part, from that point forward any new sketch will actually use a face on the model to continue the sketching process.
Here we'll go ahead and create a circle that's similar to what we did in the previous video. I'll finish my sketch, and I can extrude that. But for this feature, I've not used the origin geometry. Instead, I've used a face off of one of the previous features I've created, and that process will continue as we move forward with part modeling.
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