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Prior to ArcGIS 9.0, ArcScene displayed both sides of a TIN's areal face by default. At 9.0, backface culling was created and the default set to 'Hide backside of areal features'. As a result the areal face becomes transparent when viewing the TIN from underneath.
Instructions provided describe how to display both sides of a TIN's areal features.
Change a setting on the 3D effects Toolbar.