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 ro- tations (twists). As the contour is extruded, it will be twisted by the amount specified in the array "twist_array". The angles are measured in de- grees, and the rotation is about the origin of the contour coordinate sys- tem. The argument "contour" specifies the 2D contour to be extruded, while the argument "point_array" specifies the path along which to extrude. The vec- tor "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 automat- ically 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, specify- ing 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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