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Shared regions between two volumes or a volume and a surface can be extracted using the Intersect option.

  1. Select the Geometry Geology workflow tab workflow tab.
  2. Select at least two geometry volumes or one volume and one surface. All volumes must intersect each other to be able to intersect any volume. If you select one volume and one surface, ensure the surface cuts through the entire volume. Ensure the entire Entity is selected for each added volume or surface.
  3. Select the Intersect Intersect icon option from the toolbar or the 3D Boolean sub-menu in the Geometry menu.
  4. A dialog should appear to allow you to edit the two volumes or one volume and one surface that was selected. You can modify the entities selected using the drop-down menu.
  5. For two selected volumes it is relatively straight forward to visualize the intersected volume that is extracted.
  6. For one selected volume and one surface, the volume extracted is based on the direction of the surface normals. Each plane section of a surface has a plane normal, which should all be oriented so that one side of the surface is the positive side (the side the normals are pointing towards) and a negative side (the side the normals are pointing away from). The volume that is on the negative side of the plane normal is extracted. You can try this by drawing a volume and a plane that fully cuts through the volume. Try using the Intersect tool and then rotating the surface 180 degrees and trying it again.

NOTE: that Subtract and Intersect options perform opposite operations. The volume that remains using one option would be the volume removed in the other option.

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