Default UI Menu: Modify/Modify 3D Objects/Surface Mesh/Join Coplaner Faces
Ribbon UI Menu:
Combines selected faces which share a common plane into a single face.
To Combine faces:
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Select the tool.
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Select Faces.
- Click finish.
Options:
Use Neighbor Faces: When this option is on the resulting face will be formed from all faces on the object which are co-planar, and connected on that plane to the selected faces.