Creating Flowed Surfaces

To create a flowed surface

Select the button from the Surface toolbar or the Flowed (Surface menu) command. The dialog box for the command is displayed:
Select the Blend Ends check button if you want to blend the initial cross-section into another cross section at the other end of the flow line. The flow surface is a linear blend between the two cross-sections.
Select the required Flow Type:

Type a name for the surface, if required.
Select Display to set the surface display parameters. The Display parameters now appear.
Enter the required number of patches in the U and V directions into the U Patch and V Patch boxes respectively.
Enter the required number of display points in the U and V directions into the U Display and V Display boxes respectively.
Click OK to accept the parameters for the command.
Make an entity digitise on the flow line in response to the ‘Select an entity for drive line’ prompt.

Make an entity digitise on the cross-section in response to the ‘Select cross section profile’ prompt. The cross-section can be an arc, curve or continuous entity. When a continuous entity is used, all constituent entities must exist on the same plane. When a curve is used, all control points must exist on the same plane. The cross-section need not be normal to the end of the flow line.
If the Blend Ends check box has been selected, make an entity digitise on the cross-section at the second end of the flow line in response to the ‘Select final section profile’ prompt. This cross-section is also subject to the conditions described for the initial cross-section. When two cross-sections are used, the entity digitises which select them must both be on the same side of the flow line or a twisted surface is created.
Perform a finish.

This example shows a single cross-section, in the form of a continuous entity, flowed along a curve.