Learn about building a boundary surface.
- [Instructor] In this movie, we're going to be looking at a couple different ways to create a boundary surface. The first one's going to be pretty straightforward just using two simple curves. The first thing I want to do is make sure I have my model that's been sliced up into quadrants, which we did using the Split Line command in the previous movie. Because I have this quadrant up here, you can see I just have that arc I can easily select. I can do exact same thing at the top here and select that arc. That's where we're going to be creating the boundary surface between the two. Let's go over here to Surfaces. Click on Boundary Surface. As far as direction number one, let's go ahead and choose that upper edge right there, so we can zoom in right there, click on that edge.
There it is. Then, come over here and make sure we're choosing on the same side. Choose that one there. We can see we've got a boundary surface that's been created between the two. Now, instead of this None, I want to go down here and click on Curvature to Face, or Tangency to Face. We have a couple different options for how we can create that surface. Do the same thing over here. Curvature to Face. You can see there you got a nice little surface that's been created. Now, you can click on these arrows here and drag them in or out to create or modify that surface and define how much influence each one of those has on that surface.
You can come over here and then actually type in a value if you wanted to, or just grab the arrows and drag them around. If you choose the other surface here of the other edge, you can then, I'd do the exact same thing. Whichever one is highlighted, you have the control to type in a value or drag the arrow out to commodify that surface. Once you have something that you like, go ahead and click on the green check mark, and there's our very first surface. Now, down here at the bottom we have a little bit more complicated situation. We actually have a couple of these guides that we want to use to define where that surface actually lies.
The first thing I want to do is create a helper surface. To do that, I'm going to go ahead and choose this Right Plane, start a sketch, choose this line right here, and I'm going to convert that over. Then, I'm going to create a surface, which is going to be an extruded surface. Let's go ahead and just choose a Mid Plane. Let's type in two inches. The only reason I'm creating this is that a helper surface so I can project some lines into it so I can create the edges of my new surface. Click on okay, there it is. Now, what I'd like to do is create a regular plane.
Go over here to Features, Reference Geometry, Plane, and I need three points. The points I'm going to be choosing are this little point right there, this one right over here, and then come down here where this intersects again, and choose this point, I'll spin around, here we go, right there. Those are the points we need to create that surface. Click on okay. Now, directly on that surface, let's create a sketch. So, start a sketch and just do some really simple lines, and just connect the dots.
Now, you could use a spline if you wanted to, but, in this case, a regular line will work just fine. Click there. All right, that's my first line. Then, exit out of that sketch. First thing's first. We want to project this line we just created. Actually, let's hide this plane 'cause it makes it a little bit hard to see what's going on. There's that line we just created. I want to project that line onto that surface. To do that, let's go over here to Features, go to Curves, projected curve.
I'm going to choose this sketch right there, and I want to project it onto that surface. Click on okay. Reverse the projection. Click on okay. And there is our curve. Pretty nice. Let's do exactly the same thing on the other side here. Let's go ahead and go back to that plane right there. Let's go ahead and start a sketch. Create a basic line. Now, I'm going to connect the dots from here up to there.
Exit out of that sketch, and come back over here to Curves, Project Curve. That sketch onto that surface there. Make sure we do reverse the projection so it's projecting directly to where we want to be. Click okay. Now, I have those two curves which are going to guide my boundary surface. It's kind of a lot of work to do that. You have to create the helper surface. You have to create the plane. You got to create the lines, and you have to project them up there. But, what that's allowing me to do is completely control that surface. Now I know that my surface is going to go along that line.
It's going to be following this line down here and this line over here. So, I have three guide-lines. If I hide the helper surface, this one here, let's hide it, you can see it's not there. I'm going to go ahead and hide these ones here, too, so you can see that there's our surfaces on the edges where they connect to, and then let's go back and show this one again. You can see on the bottom that's what's going to control that surface. Once we have those things, we're pretty much all set to create that boundary surface. Go to Surfaces, come over here to Boundary Surface.
My first direction's going to be this edge right here. My second one's going to be this one right here. Notice it creates the boundary surface. Now, as far as direction number two, what we want to choose is, let's go ahead and choose this edge right here. Look, it already brings it up, which looks good. I also want to chose the far edge, looks good. Then go ahead and choose that edge down there at the bottom. Click okay, and there it is. As you can see, we've controlled all edges of this boundary surface so it exactly matches the guide curves we were originally given with a perfect match boundary surface.
Once all that's okay you can, of course, change the way that the curvature is setup, like something like Tangency to Face. But, in this case, we don't really need to because all those lines were originally created exactly tangent. So, in this case, I can just go ahead and turn that back to None. Either way, doesn't really matter. Click on okay, and there is our perfect surface. And, if we look directly at the right plane, you can see this surface perfectly matches the two guide-curves that we were given and it looks really nice. There's a couple different ways to create these boundary surfaces. Obviously, the first option is way, way easier just by clicking and choosing the two individual curves, and then just applying the different direction vectors and the effect that they have on the surface.
The second one is a lot more control. It takes a lot more work, but you can get exactly what you're looking for in creating a boundary surface, and that's what we have.
- Exam-taking techniques
- Surfacing tools
- Creating splines and 3D curves
- Building a boundary surface
- Extending and untrimming surfaces
- Knitting surfaces together
- Creating surface fillets
- Using the Thicken tool