gleTwistExtrusion

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

Signature

gleTwistExtrusion( int( ncp ) , gleDouble[][2]( contour ) , gleDouble[][2]( cont_normal ) , gleDouble[3]( up ) , int( npoints ) , gleDouble[][3]( point_array ) , float[][3]( color_array ) , gleDouble[]( twist_array ) )-> void
gleTwistExtrusion( contour , cont_normal , up , point_array , color_array , twist_array )
gleTwistExtrusion( c_int(ncp), arrays.GLdoubleArray(contour), arrays.GLdoubleArray(cont_normal), arrays.GLdoubleArray(up), c_int(npoints), arrays.GLdoubleArray(point_array), arrays.GLfloatArray(color_array), arrays.GLdoubleArray(twist_array) ) -> None

Parameters

VariablesDescription
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 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 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 diffuse, specular, ambient, etc. colors.

Author

Linas Vepstas

See Also

gleExtrusion gleSuperExtrusion