Creating Swept Surfaces Using a Linear Profile

You can create swept surfaces that use an implicit linear profile by defining two guide curves and limits to each guide.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select Two Limits from the Subtype list.

   
   
   

3. Select two guide curves.

4. You can enter one or two length values to define the width of the swept surface.

   
   
   

5. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can create swept surfaces that use an implicit linear profile by defining the limits and using second curve as middle curve.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select Limit and Middle from the Subtype list.

   
   
   

3. Select two guide curves.

4. Select the Second curve as middle curve check box to use the second guide curve as the middle curve.

   
   
   

   Important: Selecting the Second curve as middle curve check box automatically selects this mode.

5. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can create swept surfaces that use an implicit linear profile by defining reference surface.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select With reference surface from the Subtype list.

   
   
   

3. Select a guide curve, a reference surface and key in an angle value.

   Important: The guiding curve must lie completely on this reference surface, except if the latter is a plane.

4. You can enter one or two length values to define the width of the swept surface.

   
   
   

   Important: The angular definition defined by the law (if selected) applies to the projection of the normal to the reference element in the sweeping plane normal to the spine.

5. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can create swept surfaces that use an implicit linear profile by defining reference curve.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select With reference curve from the Subtype list.

   
   
   

3. Select a guide curve, a reference curve, and key in an angle value.

4. You can enter one or two length values to define the width of the swept surface.

   
   
   

5. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can create swept surfaces that use an implicit linear profile by defining the tangency surface.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select With tangency surface from the Subtype list.

   
   
   

3. Select a guide curve, and a reference surface to which the sweep is to be tangent.

4. Depending on the geometry, there may be one or two solutions from which to choose, either by clicking on the solution displayed in red (inactive), using the Previous or Next buttons or entering a solution number in the Solution(s) field.

5. You can select the Trim with tangency surface check box to perform a trim between the swept surface and the tangency surface. The portion of the tangency surface that is kept is chosen so that the final result is tangent.

   Two solutions
   
   
   Choosing solution 2
   
   
   Choosing solution 2 with Trim option
   
   

6. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

7. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can create swept surfaces that use an implicit linear profile by defining draft direction.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select With draft direction from the Subtype list.

   
   
   

3. Select a guide curve and a draft direction (a line, a plane or components).

4. Select the draft computation mode:

   
   

   • Square: equivalent to implicit linear profile swept surface with reference surface, using a plane normal to the draft direction as reference surface, and the projection of the guide curve onto this plane as spine.
   • Cone: envelop of cones defined along a given curve. In order to have swept start and end planes similar as the square mode, the guide curve needs to be extrapolated and the resulting surface split as explained in the following figure.
   
   
   • Choose the angular definition:
     
     • Wholly defined: the angular value varies during the whole sweeping operation
     • G1-Constant: a different draft value for every G1 section can be set; in this case, a relimiting plane is requested when defining lengths
     • Location values: on given points on the curve, angular values can be defined.

   Warning: The Location values tab is only available for a square computation mode and will work only on G1 curves.

5. Choose the length types:

   
   

   • From curve: the swept surface starts from the curve
   • Standard: the length is computed in sweeping planes (defining 0 is similar as choosing From curve)
   • From/Up to: the length is computed by intersecting a plane or a surface; a point can be selected: a plane parallel to the draft plane would be computed
   • From extremum: the lengths are defined along the draft direction from an extremum plane; L1 corresponds to the "maximum plane" in the draft direction, L2 corresponds to the "minimum plane" in the draft direction
   • Along surface: the length is used as the distance of an Euclidean parallel curve to relimit the swept surface

   The start (or end) section of the swept surface (in yellow) does not coincide with the expected relimiting plane (in green). As a consequence, the blue portion needed is missing.

   Here are the steps performed to create the swept surface. As an information purpose, we put all the elements explaining the steps above in Geometrical Set.2, so that you understand how the sweep surface is created.

   
   
   1. The guide curve is extrapolated in curvature (pink curve)
   2. The result is split by the green plane to obtain the green end section.
      
      

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.
   
   

   Warning: Be careful when using a draft direction and a planar guide that is not continuous in tangency: it may lead to an invalid topology with surfaces that are not joined, if the draft angle is not constant or if the draft direction is not normal to the guide plane. We advise you to use a relimiting plane in order to cut surfaces and obtain a valid topology.

You can create swept surfaces that use an implicit linear profile by defining two tangency surfaces.

1. Click Sweep .

   The Swept Surface Definition dialog box appears.

2. Click the Line profile icon and select With two tangency surfaces from the Subtype list.

   
   
   

3. Select a spine, and two tangency surfaces.

4. You can select the Trim with tangency surface check box to perform a trim between the swept surface and the tangency surface. The portion of the tangency surface that is kept is chosen so that the final result is tangent.

   Swept surface without trim
   
   
   Trim with both surfaces
   
   
   Trim with first tangency surface
   
   
   Trim with second tangency surface
   
   

5. If needed, select a Spine to specify a spine different from the first guide curve. If no spine is selected, the guide curve is implicitly used as the spine. If the plane normal to the spine intersects one of the guiding curves at different points, it is advised to use the closest point to the spine point for coupling.

6. Click OK to create the swept surface.

   The surface (identified as Sweep.xxx) is added to the specification tree.

You can preview the various solutions you will get after completion of the command.

Warning: This option is only available with the With reference surface, With reference curve and With draft direction subtypes.

When creating a sweep, you are now able to preview the four solutions based on the values given for the Angle and Lengths. The first solution corresponds to Angle, Length1 and Length2 values, the second solution to -Angle, Length1 and Length2 values, the third solution to Angle, Length2 and Length1 values, and the fourth solution to -Angle, Length2 and Length1 values.