Union 3D Tool | 3D Features Toolset | 3D Analyst ArcToolbox

Summary
Merges closed, overlapping multipatch features from an input feature class.
Usage
Closed multipatch geometry is required for this analysis. The Is Closed 3D tool can be used to determine if a multipatch feature class contains closed features, and the Enclose Multipatch tool can be used to eliminate gaps in multipatch features.

Multipatch features encompassing overlapping volumes are combined by intersecting the shells of the features and removing redundant interior portions. This process occurs iteratively until all multipatch features in the feature class have been processed.

A grouping field can be used to identify features to be unioned, such as when the multipatches represent building parts in a city where multiple features represent one building. This can significantly improve performance by reducing the number of times the tool must iterate through the dataset. Rather than comparing a feature against all features, it is only compared against those that participate in its group.

When optimization is enabled, the tool attempts to automatically subset the features into groups by analyzing the bounding box for each feature. Disabling optimization can increase the tool's performance if a grouping field has been specified. Optimization can also be disabled in the absence of a grouping field if the desired output is to union all overlapping features into a single multipatch.

Use caution when deciding how many features to aggregate, as very large and complex features may be created in the output feature class which may exhibit poor display performance.
A warning stating that the resulting feature is not simple and could not be created is raised if two or more multipatch features share only an edge or a vertex. The same message is returned if a group contains multipatches that share no volume or space.

An optional table can be created to identify the attributes of the source features that were unioned to create each unioned output.

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