GPBDFM - Set Back Data Filtering Method

Purpose

Use GPBDFM to insert a Set Back Data Filtering Method structure element into the open structure following the element pointer, or to replace the element pointed at by the element pointer with a Set Data Filtering Method structure element, depending upon the current edit mode.

This element specifies the back data filtering method that the graPHIGS API uses to perform data mapping on back facing portions of subsequent area primitives.

If the face distinguish mode (GPFDMO) is 1=NONE , then the graPHIGS API uses the current data filtering method for data mapping on the front and back facing portions of area primitives. If the face distinguish mode is 2=COLOR_SURFACE_PROPERTIES , then the graPHIGS API uses the specified back data filtering method for data mapping on only back facing portions of area primitives. When the data mapping method is 2=SINGLE_VALUE_UNIFORM , the graPHIGS API ignores the boundv parameter.

The traversal default back data filtering methods are:

Minification:

1=SAMPLE_IN_BASE

Magnification:

1=SAMPLE_IN_BASE

U-dimension:

1=CLAMP

V-dimension:

1=CLAMP

If any specified value is not supported on the workstation, then the default value is used.

Parameters