Crease or uncrease an edge

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Crease or uncrease an edge.

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In this video, we'll use crease and uncrease.

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In Fusion 360, we want to get started with the supplied data set car hood.

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We're going to take a look in the timeline and note that there's a single form feature, we'll right click and edit this form body.

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When we do that, you can see the red body underneath.

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The red body underneath shows the converted BREP.

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If we make a drastic change, notice that as soon as I click on a surface, it's asking me to upgrade the Tspline body.

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Any time there's a new tool added to the form workspace, any older form bodies will be prompted to be converted,

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so they can make use of those new functionalities.

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If I take this selected face and move it down, we can see the transparency underneath of the original body.

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I'm going to select Cancel, finish the form and back in the design workspace, I'm going to hide the surface body.

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But when we go back to the form and edit, the form body is shown there.

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So if you don't like seeing the transparency underneath, you can always hide the original body.

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There are also some user preferences that determine whether or not we see ghosted images,

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but in this case it's much easier if we just simply hide the body in the design workspace before we edit the form.

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Now that we've taken a look at changing the display, let's talk a little bit about modifying the form that we see on the screen.

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This is a complex design that has a lot of curvature,

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but in some cases, we might want to have sharp edges, in those cases, we want to use a tool called crease.

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So let's take a look at some areas of this design that already have a crease.

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We can see that there's a very sharp transition in this corner.

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In some cases that works out perfectly, but in other cases that might introduce problems downstream in the model.

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So let's take a look at going to modify and we want to select crease and we're going to add a crease to some additional edges.

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We're going to grab these vertical edges here, working our way all the way toward the midline.

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As soon as we get close to that midline where we have our line of symmetry, you'll notice that the crease carries on.

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So we'll say, OK, and now we've added this crease.

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With crease added, we need to make some adjustments by selecting this vertex and simply moving it over slightly and then we'll say, OK.

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Now let's go ahead and view the model and that looks pretty good, that crease really helps the design.

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In some cases, however, we might not want to carry that crease.

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You'll notice that here the crease is actually stopped into a smooth transition.

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We want to make sure that we maintain curvature continuity, we want to make sure that we have that nice smooth transition.

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So in some cases we might want to go to modify and select uncrease,

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then we can select previously creased edges and we can remove that crease and say, OK.

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When we remove creases now you can see we have nice curvature continuity in that area.

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However, it's introduced another problem.

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This area here really shouldn't have a crease because it's causing problems downstream in the model.

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So once again we can go to modify and uncrease and we can remove the crease in this edge and this will allow us to carry that transition.

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However, it does mean that we need to go to modify uncrease and likely carry this crease further down on the design.

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We want to go all the way to that symmetry line and now this is a much better transition.

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We can see that we have that nice smooth transition but we do have a hard edge here that might potentially cause problems downstream,

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but for right now everything looks pretty good.

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So this is a great tool to play around with, especially if you want to add some small fillets or details downstream.

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You can certainly do that after the body has been converted and you can add fillets back in the design workspace.

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For our examples, however, we want to make sure that this opening here is nice and smooth,

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but the front area for the grill has that nice crease on the outside and the inside.

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Let's navigate back to a home view and save the design before moving on.