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Blend Processing

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All blend processing starts with the assignment of a variety of blend attributes to an ACIS body. Some of these attributes directly drive blend processing and might be termed primary blend attributes. Examples include a face-face or vertex blend, or an initial entity-entity blend. Other secondary blend attributes offer detailed guidance on the kind of blend to be made at particular places on the body.

Blend processing begins with a list of primary blend attributes, the attributes being considered one at a time in list order. Successful processing of a blend attribute creates one or more blend faces. At the same time, new primary blend attributes may be made and attached to entities of the blend body and are also placed in the list. Blend processing may also cause attributes already in the list but not yet considered to be removed from the list. If the processing of a blend attribute is unsuccessful, the attribute is moved to the end of the list for later reconsideration, or removed from the list.

In edge sequence-following blending, the user places blend attributes on a network of edges and vertices. These attributes form the initial list. In entity-entity blending, the user places a single primary and any number of secondary blend attributes on the body. The primary blend attribute constitutes the initial blend list.

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