Learn how to extract isolines from surfaces to generate more surfaces using the LOFT command.
- [Instructor] Our next mission is to build the handlebars and grips that will slide onto them. So, let's make two layers, I'll make a 3D layer, -Handlebars and I'll give that let's say a light gray color, color 254 and I'll make that the current layer. I'll also create another layer, -Grips and I'll make that with a darker gray color, color 251.
Now I'd like to draw the cross section of the handlebars, so I'll reset the UCS and then draw a circle centered up here and the radius will snap to the boundary there and then on the Surface tab, I will sweep the last object that I created, mainly the circle, I'll type L, enter to select it, enter and then click on the spline path to form the handlebars.
I'll say no, don't erase the defining objects. And then I'll zoom in up here and let's go into Shaded with Edges mode and then we need to patch the top of this, enter, enter, to create a surface up there. Now I'd like to have a circle up here. Right now we just have two different surfaces. I'll use Extract Isolines to generate 2D geometry from my 3D surface.
I'll select this surface and as I move the cursor, you can see the isoline that I could generate anywhere that I click. I'm actually going to click right on the top up here and snap it to this quadrant. Enter. That actually creates the circle up here. Now, I'm going to offset that circle three millimeters to the outside, so now I have two circles up there. I'll extrude the outer circle down 140 units.
Erase defining objects? No. And this object should be on the grips layer, so I need to reassign that here in Properties. I'll also make the grips layer current over here. We have two circles at the top and because of that, I can use the loft tool to create a surface between those circles.
Enter, enter. Erase defining objects? No. So, now we have a surface up there. Now I'd like to slide this down a short distance on the handlebars and start by changing the visible style to wireframe and now I can attempt to move this. This time I'll move it with a crossing window which should select those three items and I'll move it from the end of the path and now I can see the path, so I'm going to force a nearest snap by typing NEA, enter, then I'll click some point on that path to slide the handlebar grip down.
Then I'll switch back into Shaded with Edges mode. You can see the result. I'll orbit around. You can see that we have a gap here that we need to fill in, so right now this is just a surface. I'll extract isolines from this surface, then place it right on the end. That generates a circle there. Now, I'll do the same thing on the handlebars and this time I'm not going to snap it, I'm just going to bring it down maybe a little lower than the grip.
That will generate a circle here. Then I'll create a loft between these two circles. Enter, enter. Erase defining objects? No. So, now we have the appearance that the grip kind of tapers down to the handlebar which is a nice detail. I'll zoom out. Now I'd like to get all of this information on the other side, so I can mirror it. However, mirror works in the XY plane and that's flat on the ground right now.
Change that by typing UCS, enter, X, enter, enter and then mirror, select all of these objects with a window, enter, and then I just need to click somewhere on one of my sketches in the center line here and then click a point over here, erase source objects? No. And there you have it, handlebars with grips.
- Establishing a layer convention and property filters
- Extracting isolines
- Trimming and extruding surfaces
- Lofting cross sections
- Sculpting watertight surfaces into solids
- Sweeping and sculpting
- Revolving boundaries to create surfaces
- Welding objects together with Fillet Edge
- Rebuilding NURBS surfaces
- Offsetting a surface