About Creating Analytical Surfaces
When you create an analytical surface using Restyle:
You can first select a domain and then select the required surface-creation tool. Restyle automatically creates the surface. You can also select the tool and then select a domain.
If you click the Domain check box, select a domain to define a surface. Otherwise, you must select a point on facets for creating a planar, cylindrical, or extruded surface or one or two points on facets for creating a conical or revolved surface depending on whether you do or do not define the direction for creating surfaces.
Clicking the Full check box creates a complete 360 degree surface for a cylinder, cone, or revolved surface; or for a surface based on a closed section for an extruded surface. You cannot use Full for a flat surface.
Before creation of an analytical surface, you can select only datum points as origin points. While modifying an analytical surface, you can select any location on the facet as a reference for the origin point.
When you select a datum point for the origin reference, the analytical surface is located in such a way that its origin point exactly matches the selected datum point in its final position.
Before creating a surface, you can optionally select a datum axis, datum plane, or surface to specify the direction. For conical, cylindrical, and revolved surfaces the defined axis is the axis of revolution.
After the surface is created or when you are modifying the surface, you can modify the coordinates of the origin and the angles of direction. You can also move the origin parallel to a defined direction by selecting a point on the facet model. This is especially useful for conical surfaces and extruded surfaces with a draft angle.
Restyle uses the coordinate system to recalculate the coordinates of origin and the direction angles. You can specify the coordinate system to be used for these calculations. Otherwise, Restyle uses the default coordinate system.
Selecting proper references such as datum axes or datum planes results in accurate creation of analytical surfaces.