About the Representation of Solid and Nonsolid Geometry
When you access Import DataDoctor (IDD) on the Import tab while redefining imported features or inserting non-native part models in existing parts, the Geometry and Topology Structure (GTS) Tree in IDD displays the solid and non-solid geometry of the non-native models as top-level nodes.
Separate nodes represent the solid bodies and the quilts of the imported features on the GTS Tree as follows.
• A solid body node, by the system-assigned generic name of Body #### or the explicitly-assigned name that is read from a source file, is a top-level base node. A top-level body node represents a single solid body of the imported feature. When an imported feature consists of multiple solid bodies, the number of top-level body nodes on the GTS Tree are the same as the number of solid bodies contained in the imported feature. This is regardless of whether the solid bodies are generated from the solid or nonsolid geometry such as quilts after import.
• A non-solid top-level base node, by the system-assigned generic name of Quilt #### or the explicitly-assigned name that is read from a source file, represents a surface quilt of the imported feature. This quilt node contains all the constituent surfaces that represent the individual quilts of the imported feature.
• A top-level node called ADD_1 is created on the GTS Tree when you add geometry from a file that consists of standard or curve-type import features during the redefinition of the import feature. The solid geometry of the multiple bodies in the import feature are added as quilts to this new node on the GTS tree. The ADD_1 node is a non-solid node that consists of quilts.
• A top-level compound node with individual component sub-nodes consist of individual component nodes that contain sets of related surfaces. When the topological connections between the surfaces of the solid or the quilt node fail, all such individual surfaces and quilts are contained in a single top-level compound node that represents a single body. The constituent surfaces and quilts are not exploded or individually represented as surface leaf nodes on the GTS Tree.
• The Datum node contains datum features such as points, planes, axes, and coordinate systems.
Empty bodies are created when the nonsolid quilts of the body nodes on the GTS Tree fail to close. These bodies remain empty without solid bodies until you repair the quilts that failed to close.