Mesh > Booleans > Union

Combines the volume of the meshes you select. The original two objects are preserved minus the intersection.

Use legacy Boolean algorithm
When on, performs the selected boolean operation using the legacy boolean algorithm.
Note: Scenes with boolean nodes that were created using Maya 2014 or earlier versions automatically use Maya's legacy boolean algorithm.
Preserve Color
When on, preserves color per vertex data on your meshes. See Assign colors to polygon vertices.
Intersection Classification

Boolean operations are performed on intersections. When working with open meshes (planes or meshes with holes), Maya can calculate the intersection of the selected meshes in two different ways:

Edge
Edge classification treats open meshes like closed volumes.
Normal
Normal classification treats open meshes like open volumes.

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