Join Scott Onstott for an in-depth discussion in this video Lofting surfaces from cross sections, part of AutoCAD: 3D Surface Model Design.
- At this stage, we have a series…of circular cross-sections,…representing this rear-triangle element.…We now need to move them up…in the z direction to various heights…to represent the 3D curvature of this element.…You see, this part of the frame…has to start at the seat-tube,…and it has to bend up around the rear-tire,…and go over here to some height above the ground.…So, to help us visualize…this rather complex 3D situation,…let's draw in a few lines.…
Zoom in here and draw a line…at the end-point of the yellow, curved path.…Draw it straight up, 70 mm in height.…Type "70", "enter", "enter",…then continue drawing the line.…So just press "enter", "enter", to continue,…then come over here and snap it…to the opposite end of the curved path.…And then, complete the picture by snapping…another line back to where you started from.…
So now we have a triangle.…Let's go ahead and change the UCS to match up…with this triangle, which defines a plane.…Type "UCS", "enter",…click the origin point right here,…click the second point right here,…
Author
Scott Onstott
Released
11/11/2014- Creating layers for 3D modeling
- Extracting isolines
- Trimming and extending surfaces
- Extruding 2D curves into 3D surfaces
- Lofting cross sections
- Converting solids into surfaces
- 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
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome42s
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1. Modeling a Bicycle Frame
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Extracting isolines4m 10s
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Drawing a profile6m 6s
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Trimming surfaces4m 42s
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Revolving profiles3m 8s
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Lofting with the Path option2m 45s
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2. Creating the Belt-Tensioning Mechanism
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Extruding a region2m 32s
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Modeling fasteners5m 30s
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3. Building the Drivetrain Components
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Using Booleans on 2D regions4m 35s
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4. Modeling the Rear Brakes
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5. Creating the Rear Wheel
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Sweeping and sculpting6m 29s
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6. Making the Power Components
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Smoothing a mesh object4m 13s
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Tilting up extruded objects4m 30s
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7. Modeling the Front End
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8. Creating the Handlebars
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9. Making the Seat
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Conclusion
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Next steps15s
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Video: Lofting surfaces from cross sections