Use GPBICD to insert a Set Back Interior Color Direct structure element into the open structure following the element pointer or to replace the element pointed at by the element pointer with a Set Back Interior Color Direct structure element depending on the current edit mode.
This structure element specifies direct color values. During structure traversal, the graPHIGS API uses these values to render the back facing portions of all following area definitions if the interior style is set to 1=HOLLOW (see GPIS - Set Interior Style) and the edge flag is set to 1=OFF (see GPEF - Set Edge Flag) or if the interior style is set to 1=HOLLOW the interior style is set to 2=SOLID or 4=HATCH
Face distinguish mode must be set to 2=COLOR_SURFACE_PROPERTIES If the face distinguish mode is 1=NONE , then the graPHIGS API uses the current interior color to render the back facing portions of all following area definitions.
This attribute sets the same traversal state as the Set Back Interior Color Index (GPBICI) subroutine. The traversal default for back interior color is the content of entry 1 of the rendering color table.