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gleTwistExtrusion(3GLE)		      GLE	       gleTwistExtrusion(3GLE)

NAME
       gleTwistExtrusion  -  Extrude  arbitrary	 2D contour along arbitrary 3D
       path, specifying	local rotations	(twists).

SYNTAX
       void gleTwistExtrusion (int ncp,
		       gleDouble contour[][2],
		       gleDouble cont_normal[][2],
		       gleDouble up[3],
		       int npoints,
		       gleDouble point_array[][3],
		       float color_array[][3],
		       gleDouble twist_array[]);

ARGUMENTS
       ncp	 number	of contour points

       contour	 2D contour

       cont_normal
		 2D contour normals

       up	 up vector for contour

       npoints	 numpoints in poly-line

       point_array
		 polyline vertices

       color_array
		 colors	at polyline verts

       twist_array
		 contour twists	(in degrees)

DESCRIPTION
       Extrude arbitrary 2D contour along arbitrary 3D path, specifying	 local
       rotations  (twists).  As	the contour is extruded, it will be twisted by
       the amount specified in the array "twist_array".	The  angles  are  mea-
       sured  in  degrees, and the rotation is about the origin	of the contour
       coordinate system.

       The argument "contour" specifies	the 2D contour to be  extruded,	 while
       the  argument  "point_array" specifies the path along which to extrude.
       The vector "up" defines the orientation of the contour y-axis  in  real
       3D space.

       Note that neither the very first	segment, nor the very last segment are
       drawn. The first	and last segments serve	only to	define	the  angle  of
       the  join  at the very ends of the polyline. Thus, to draw one segment,
       three must be specified.	To draw	two segments, four must	be  specified,
       etc.

       The  normal array may be	NULL. If it is,	normal vectors will NOT	be au-
       tomatically generated, and the object will look terrible	when lit.

       The color array may be NULL. If NULL, the current color is used.	If not
       NULL,  the  glColor3f()	routine	 is  used to set the color; therefore,
       specifying the glColorMaterial()	subroutine before this	primitive  can
       be used to set diffuse, specular, ambient, etc. colors.

SEE ALSO
       gleExtrusion, gleSuperExtrusion

AUTHOR
       Linas Vepstas (linas@fc.net)

GLE				      3.6	       gleTwistExtrusion(3GLE)

NAME | SYNTAX | ARGUMENTS | DESCRIPTION | SEE ALSO | AUTHOR

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