gleTwistExtrusion(3GLE) GLE gleTwistExtrusion(3GLE)NAMEgleTwistExtrusion - 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 measured in
degrees, and the rotation is about the origin of the con
tour 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.
GLE 3.6 1
gleTwistExtrusion(3GLE) GLE gleTwistExtrusion(3GLE)
The normal array may be NULL. If it is, normal vectors
will NOT be automatically 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 dif
fuse, specular, ambient, etc. colors.
SEE ALSO
gleExtrusion, gleSuperExtrusion
AUTHOR
Linas Vepstas (linas@fc.net)
GLE 3.6 2
