To Define the Poly Motion Region
The Poly Motion Region lets you specify:
• The rule for modifying the surface shape
• Boundaries of the region where the curve can move
You can set the Poly Motion Region in one or two directions. You can set a different Poly Motion Region for each direction.
1. Click
Edit >
Modify in Scan Tools.
2. Select a spline surface to modify. The Modify Surface dialog box opens.
3. Click Region on the Modify Surface dialog box. The Region section opens in the dialog box. The two arrows on the screen show the gridline directions. The green arrow indicates the first gridline direction, and the red arrow indicates the second direction.
4. Set the region in the first direction by selecting one of the following from the list:
◦ Local—Moves the selected point only.
◦ Smooth Region—Applies the movement of the point to all points in the specified region by a cubic law.
◦ Linear Region—Applies the movement of the point to all points in the specified region by a linear law.
◦ Constant Region—Moves all the points included in the specified region by the same distance.
5. For Smooth Region, Linear Region, or Constant Region, you can optionally select the boundaries of the region in each direction. Click Region and select two control polylines of the polyhedron to bound the region in a specified direction. The default Poly Motion is Smooth, applied to the whole surface.
6. Set the Poly Motion Region in the second direction in a similar manner.