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3D Object

Generic 3D Section

Z-axis of a Generic 3D Object is a privileged one. All lines of the object are parameterized by the local z coordinate.

Every 3DO has a Base. Base is an array of points on the object's axis ( z-axis ). We call these points Base Knots. A generic 3D Object has at least two knots: minimal and maximal values of z coordinate for the object. Knots are used to define plot of different parameters of the model against axis of the object. These plots are called Profiles. For example, x coordinate of a 3D Curve is a function of z coordinate. Its plot against z normally represented as a strip of lines (or arcs). Knots are points of z-axis where those segments are joined. For the default case of two knots, each such a strip will have only one segment. Adding extra knots allows creation of more complex geometry and approximation of any shape. Programmatically the set of knots is managed by IAxiBase interface. 

The simplest surface in DI models is a patch.  A patch is a piece of surface between two 3D Curved Segments.

When base of a Generic 3D Object has more than two knots, surface of the object consists of Patch Strips.

Surface of a Generic 3D Object ( 3DO ) consists of Patch Strips. Patch Strips are joined together by their edges. Edges of patch strips are 3D Curve Elements. In a sense surface of a Generic 3D Object can be considered as a strip of Patch Strips.

Each 3DO keeps current z-axis position called cross position. Plane orthogonal to axis of the object at the cross position (and parallel to x and y plane) we call Cross Plane. Cross plane can be displayed in 3D Debugger by checking the correspondent check box on "3D" page of the Form View. Cross-sections of 3DO are two-dimensional Segment Strips, which can be edited in Cross-section Editor.

When cross-section of a 3DO is a closed strip, 3DO can be rendered as a solid object.