NAME

SET FACE CULLING MODE − create a structure element to set the face culling mode

SYNOPSIS

C Syntax

void
pset_face_cull_mode ( mode )
Pcull_modemode;culling mode

Required PHIGS Operating States

(PHOP, ∗, STOP, ∗)

DESCRIPTION

Purpose

SET FACE CULLING MODE creates a structure element to set the face culling mode. The attribute face culling mode defines control over the visibility of front and back facing portions of area defining primitives. See SET FACE DISTINGUISHING MODE (3P+) for details on front and back face determination. 

C Input Parameters

modeA pointer to a Pcull_mode structure. A Pcull_mode structure is defined as:

typedef enum {
PCULL_NONE,
PCULL_BACKFACE,
PCULL_FRONTFACE
} Pcull_mode;

Execution

Depending on the edit mode, a SET FACE CULLING MODE element is inserted into the open structure after the element pointer or replaces the element pointed at by the element pointer. The element pointer is then updated to point to this SET FACE CULLING MODE element. 

When face culling mode is None, both front and back facing portions are visible. When face culling mode is Backface, back facing portions are invisible. When it is Frontface, front facing portions are invisible. 

ERRORS

005Ignoring function, function requires state (PHOP, ∗, STOP, ∗)

SEE ALSO

SET FACE DISTINGUISHING MODE (3P+)

September 02, 1992