Insert edges and subdivisions

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Insert edges and subdivisions.

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In this video, we'll use insert edge, insert point and use subdivide.

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In Fusion 360, we want to carry on with our car hood and make sure that we are still in the forms tool.

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Now we're going to talk about ways in which we can insert edges to the design.

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When we take a look at this design, this front corner has a small crease in it.

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As we rotate the design around, we can see that and it becomes apparent in certain areas.

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If we go to inspect, we can take a look at curvature map analysis of the body,

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and we can follow along and see areas where we potentially have problems with the curvature.

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You can see sometimes this will appear at points where we have multiple intersections of faces.

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In other cases, this might happen where we have edges terminate in the middle of another edge.

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With Tsplines, you have the ability to create these types of intersections,

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but we need to be careful and we always want to try to maintain a four sided patch or face whenever possible.

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So in some areas you'll note this edge for example, ends in the middle of this face and there isn't really any problem there.

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However, this one here has 1, 2, 3, 4, 5 and 6 separate faces.

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So the way that we're going to approach this is by using some of the modify tools.

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First we want to note that we have insert edge, subdivide and insert point, all three of these can be extremely helpful.

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But this first case we're going to take a look at insert point.

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This will allow us to select two vertices, in this case I'll go from here to here and we'll say OK.

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This will allow us to add an edge that connects those.

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And you'll notice that a lot of the other geometry changed along with it.

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I'm going to hit control Z to undo and note that the fender itself was affected by simply adding that point.

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Let's go back to insert point, let's make the same selection.

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But this time instead of simple, let's use the exact method.

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The exact method could potentially be problematic for this selection.

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You'll note that exact is not allowing us to select those same vertices,

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and we'll have to go through the process of selecting points on the edge or potentially going to the midpoint.

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Now you see when I try to add a point there, it's creating all of these divisions that go along the body.

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I'm going to say OK to see what happens.

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But note that it created that intersection.

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It automatically went to this edge and it automatically connected this point.

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Now we have that nice smooth transition that rolls into this opening carries on into the fender without us having to make those selections.

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You'll note also that it didn't carry this edge all the way to the middle.

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So it's not universally true.

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It doesn't necessarily carry all the way through the geometry.

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But let's take a look at some of the other options.

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If we use insert edge, we can select an edge and we can determine which side it's going to be on.

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In this case, we also have simple or exact and those will have differing effects depending on your geometry.

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I'm going to set the insert location to minus 1 and then I'm gonna say OK.

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Notice when I do that it inserts it but it makes some changes to the geometry and these two points don't line up.

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There are different ways that we can work with this.

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But if we use control Z and undo you can see that it's really not giving us the result that we expect.

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Insert edge works really well when you don't intend to connect it with an open vertex.

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So insert edge would be great if we wanted to divide up a certain area to add more geometry.

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But in this case, using insert point is going to be a much better option.

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But we will need to use simple in order to go between these two points and say OK.

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So that allowed us to clean up that area, get that extra division in there,

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to make sure that we don't have any of these edges ending in the middle of another edge.

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But what about some of the other options like subdivide?

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If we go to modify and we select Subdivide, this allows us to select a face or set of faces.

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For example, if I hold down control or command, I can select a lot of faces and then you can see the divisions that are being made.

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This insertion mode is simple, which means it's able to affect change on the rest of the geometry.

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If I view this from the right hand side and change this to exact, it's going to keep the original geometry.

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But one thing you'll note is it makes a lot more surface divisions.

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Simple will add as few as possible, but it will change the surrounding geometry.

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Exact will add as many as it needs to in order to preserve the shape of your model.

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So once again, depending on the intent, exact or simple might be a good option,

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but you really have to be careful but you don't want to add too many divisions to a model.

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Let's finish this off by using insert point one more time and noting how it pulled that geometry in.

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From this point, we've added a lot of edges but we've cleaned up any potential problems we may have had by having five or six sided patches.

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So let's navigate back to a home view and let's save the design before we move on.