===== Select a flat surface =====

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How can I select the bottom face of this bunny?

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Go to Edit > Generate face groups.

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Adjust the sliders until there is a face group on the area you want to select. The face groups are indicated by the different colours.

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With the selection tool active, **double-click** on the face group you want to select.

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With the selection tool still active, it's possible to do operations that only effect the selected area. In the example, I removed the faces.