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Modeling the tweeter with Extrude and Extrude Inner

From: CINEMA 4D Essentials 2: Polygon and Spline Modeling

Video: Modeling the tweeter with Extrude and Extrude Inner

Our speaker cabinet is coming together. Now we're ready to create the tweeter that's going to be right here in the top area of the speaker cab. Let's start off by creating a Cube. I'm going to move that cube up into position on the speaker and let's do that in Front view. The rectangle that is defined by these four lines right here is where I want my tweeter to sit. So I'm going to put that up about in the center of that rectangle right there. And then I'm going to use the Object Properties of the cube to change the size of that.

Modeling the tweeter with Extrude and Extrude Inner

Our speaker cabinet is coming together. Now we're ready to create the tweeter that's going to be right here in the top area of the speaker cab. Let's start off by creating a Cube. I'm going to move that cube up into position on the speaker and let's do that in Front view. The rectangle that is defined by these four lines right here is where I want my tweeter to sit. So I'm going to put that up about in the center of that rectangle right there. And then I'm going to use the Object Properties of the cube to change the size of that.

So I'm scrubbing the X value. Let me get it above that large, so about 340 units there. And then on the Y, let's scrub it down. I'm going to change it to be about 116 on Y. As I move it in there, you can see that it's a little bit tight on the opening, so let's change that to be about 120. All I really care about is that there's a little bit of overlap on that hole, so let's switch back to the Perspective View. Orbit around here. Let's move that into position.

That's going to go right about there. You can see it covers the hole nicely and that gives us a great start for a tweeter. So let's hide the cabinet and focus just on this one object. So I'm going to hold down the Option key or Alt key on the PC and click twice on these gray dots; one, two. That's going to hide the Boolean object and now I can focus on the tweeter. So let's rename this object and call it Tweeter. And now, we can make it editable. So I'll hit the letter C on the keyboard, and I can also hit this Make Object Editable button here which is now grayed out because I've already made it editable.

So now, let's zoom in on that tweeter. What we want to do to create the tweeter is to create an inset of these polygons here that we can then push into the tweeter object. To do that, we're going to use the Extrude Inner tool. So let's start off by hitting the Extrude Inner tool and I can right click in the interface and grab Extrude Inner. And I want to first select this polygon. So let's hit the Spacebar to get to the Selection tool. Select that polygon on the front. If you're not in Polygon mode already, make sure that you click in Polygon mode over here in the left-hand side.

And now I can select that polygon and then hit the Spacebar to get back to the Extrude Inner tool. And now, I can click and drag to the left and when I do that I'm going to get an inset polygon. Now, I'm not quite sure if that's the right depth for that, so I'm going to undo that to get back to the original polygon. I'm going to drag and make it a little bit thicker, so probably about there. Let's, zoom in on it just a bit and I'm going to create one more inset. That inset is going to become the actual indentation for the tweeter.

This first inset that I created is just going to create the lip. Now, I can create that inset by dragging in and this one I'm going to drag way in to about here. Now, this is the right size on the Y-axis for the tweeter but it's the wrong size on the X-axis. Let's get the Scale tool out, hit the letter T on the keyboard and I'm going to drag to the right on the X scale and square this up. Now, I'm going to eyeball it to get it about square and I think that's pretty good right there. Bring it in right about there.

So you can see now we've got this kind of triangular shape on the front of this device that's going to allow us to push in. If I switch the Move tool, E on the keyboard, and drag that in, you can see our tweeter now has that depth and it creates just the right size box. If I render this right now, Command+R or Ctrl+R on the keyboard, you can see that my tweeter really doesn't have a lot of definition to it. It's very smooth on the inside. That's because CINEMA 4D is creating a falloff on the surface's object based on the angles here.

In order to correct this problem I'm going to need to do some knife cuts. So let's switch back to Point mode and right-click to get the knife tool. And the first cut that I want to make is around the outer edge. So remember, if you're using your Knife tool and you see a white line traveling around the surface of your object, that is a normal behavior. I am getting an error because of the screen recording software I'm using. It's not drawing that white line correctly. So if you see a white line on your Knife tool, that is normal and that's what you should be seeing.

What I'm seeing are these four dots here and those four dots correspond to where the white line would be. So I'm going to make a click about here around the outer edge and then I'm going to do another one on the inner edge right here. So let's click right about here. And what that does is define the edge of our tweeter. If we do another rendering, Command+R or Ctrl+R on the keyboard, you can see now we have a really great definition for the outer box. I still don't have a lot of definition on the inside here.

To correct that, we're going to need to do a little bit of selecting. Let's switch over to Edge mode here and we're going to do a really quick selection of some edges. The tool that I want to use to select the edges is going to be the Path Selection tool. So if I go to the Selection menu, I'm going to select Path Selection. The way the Path Selection tool works is that it allows you to draw selected paths. So I'm going to click and drag. You can see as I do that it highlights the paths that I want to draw on and when I let go, those paths are selected.

You may be seeing highlighted paths on yours and I'm not because of that screen capture software again. But I can tell that those paths have been highlighted or selected because they have gone invisible. So let's orbit around here. I'm going to hold down the Shift key and click and drag to the right. Here we go. That selects that one. Now, what I want to do is repeat that process all the way around. So let's take that one and go down here. I'm holding the Shift key down to make sure that I add to the selection. I want to grab all these edges at once.

And I'll draw a path down there and then let's orbit around to the other side. Let's hold down the Shift key again and add to the selection. While I'm here, I'll get this one too. Here we go. Let's orbit around now. And then I'm going to hold down the Shift key and grab that path right there, and that one right there, I missed it. And then grab those edges right there. Once you're done, you should have all the edges selected that make up that contour of the interior of the tweeter and the outside of the box.

What I'm going to do next is use the Bevel tool. If I right-click on the interface and go to Bevel. When I drag to the right, that's going to create a bevel. And I don't want to make it too thick. If I bevel it too much, I end up with this crazy rounded tweeter. What I want to do is just drag it to the right just a little bit. Now, of course, if I mess up I can always undo. And then I'll click and drag again. Now, you want to be careful when you click and drag. If I click multiple times and drag multiple times, I'm going to end up with these weird bevels like that. I don't ever want them to cross like that, so I'll undo twice.

And I'm just going to click and drag to the right and bevel it just like that. If I render this right now, Command+R or Ctrl+R on the keyboard, you can see we have a nice definition around the edges. We got a nice definition on the interior and I think we're in great shape. I do want to make one more cut with the knife tool right here, so let's switch to Point mode. And I'll get the Knife tool by hitting K on the keyboard and I'm still in Knife Loop mode and I'm going to make a cut right down here near the base. And when I do that, that's going to define the center of the tweeter.

Let's do another Command+R or Ctrl+R on the PC. There we go, now we've got a great looking center for that tweeter. The process of making of a tweeter object like this really centers around the idea of starting with that base object, creating the insets, and then pushing and pulling on the polygons until you have just the shape you want.

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CINEMA 4D Essentials 2: Polygon and Spline Modeling

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Rob Garrott
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