The Surface Edit > Stitch tools in Alias create a valid solid model topology.

• Stitching surfaces can greatly improve the data transfer to a solid modeler.
• The stitching process also identifies surface boundary gaps that exceed your tolerances.
• The stitching process identifies duplicate surfaces in the model and unifies the direction of the surface normals of the completed shell.

The following illustration shows three individual surfaces (labeled S1, S2, and S3). The edges of each surface are represented by dashed lines.

When models are constructed using the Alias advanced surface tools (Swept, Rail Surface and Square), it is common to create a number of smaller surfaces along the edge of one larger surface. This modeling technique does not create the twin edges required for a solid model. Stitching adds this information.