.\"##
.\" $XConsortium: p286,v 5.2 94/04/17 20:57:44 rws Exp $
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$XMCOPY
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.\" 1. Substitute PHIGS Extension function name (in CAPS) for "PNAME" in line be.\"low:
.ds pN SET BACK INTERIOR COLOUR
.TH "\*(pN" 3P+ "29 February 1991"
.SH NAME
\*(pN \-
create a structure element to set the back interior colour
.IX "PHIGS Extension Functions" "\*(pN"
.IX "Colour" "SET BACK INTERIOR COLOUR"
.IX "Filled Area Interior Attributes" "SET BACK INTERIOR COLOUR"
.IX "Aspect Source Flags" "SET BACK INTERIOR COLOUR"
.IX "Attributes, Filled Area Interior Attributes" "SET BACK INTERIOR COLOUR"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
.\" 6. Insert C syntax below
.nf
void
pset_back_int_colr ( colour )
Pgcolr	*colour;	\fIback interior colour\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, STOP, *)
.SH DESCRIPTION
.SS Purpose
\s-2SET BACK INTERIOR COLOUR\s+2 creates a structure 
element to set the back interior colour.
.LP
When the current back interior colour
Aspect Source Flag (\s-2ASF\s+2) is set to
\s-2INDIVIDUAL\s+2,
the current value of this attribute
defines the back interior colour
to be applied to the following output primitives:
.RS
.ta 0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i +0.2i
.LP
\(bu
.SM "FILL AREA"
.LP
\(bu
.SM "FILL AREA 3"
.LP
\(bu
.SM "FILL AREA SET"
.LP
\(bu
.SM "FILL AREA SET 3"
.LP
\(bu
.SM "FILL AREA SET 3 WITH DATA"
.LP
\(bu
.SM "GENERALIZED DRAWING PRIMITIVE \fI(Fill Area Primitives)\fP"
.LP
\(bu
.SM "GENERALIZED DRAWING PRIMITIVE 3 \fI(Fill Area Primitives)\fP"
.LP
\(bu
.SM "NON-UNIFORM B-SPLINE SURFACE"
.LP
\(bu
.SM "SET OF FILL AREA SET 3 WITH DATA"
.LP
\(bu
.SM "QUADRILATERAL MESH 3 WITH DATA"
.LP
\(bu
.SM "TRIANGLE STRIP 3 WITH DATA"
.ta
.RE
.SS C Input Parameters
.IP \fIcolour\fP
The colour model. Pgcolr is defined as:
.ta .5i +\w'union  'u +\w'struct  'u +\w'Pfloat      'u +\w'type;    'u +w\'x;      'u
.nf
.sp .4
typedef struct {
.sp .2
	Pint		 type;		/* indirect, RGB, CIE, HSV, HLS */
	union {
	   Pint		ind;		/* colour table index */
	   struct {
		Pfloat		x;		/* red, hue, etc. */
		Pfloat		y;		/* green, saturation, lightness, etc. */
		Pfloat		z;		/* blue, value, saturation, etc. */
	   } general;
	} val;
} Pgcolr;
.fi 
.SS Execution
Depending on the edit mode, a \s-2SET BACK INTERIOR COLOUR\s+2
element with the value back interior colour in the specified
colour model 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 \s-2SET BACK INTERIOR COLOUR\s+2
element.
.LP
Back face attributes (such as back area properties, 
back interior colour, back reflectance characteristics, 
back interior shading method, back interior style, and
back interior style index) are used only when the
face distinguishing mode has the value \fIYes\fP, and are applied 
only to the back facing portion of area defining primitives. See 
\s-2SET FACE DISTINGUISHING MODE (3P+)\s+2 for details on
front and back face 
determination.
.LP
When the current back interior colour \s-2ASF\s+2 is set to
\s-2INDIVIDUAL\s+2, area-defining output primitives, which follow in
the structure network and are subject to back face attributes, are
filled using the current back interior colour.
.LP
When the current back interior colour \s-2ASF\s+2 is set to \s-2BUNDLED\s+2,
the back interior colour is taken from the
workstation extended representation indicated by the current interior index.
In this case, the back interior colour
set with \s-2SET BACK INTERIOR COLOUR\s+2 has no effect.
.SH ERRORS
.IP 005
Ignoring function, function requires state 
(\s-2PHOP\s+2, \s-2*\s+2, \s-2STOP\s+2, \s-2*\s+2)
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "SET INTERIOR COLOUR (3P+)"
.SM "SET FACE DISTINGUISHING MODE (3P+)"
.SM "SET INDIVIDUAL ASF (3P)"
.SM "SET INTERIOR REPRESENTATION PLUS (3P+)"
.fi
