Signature
Parameters
Variables | Description |
---|---|
style |
bitwise OR of flags
|
Description
Query and set the GLE join style flags. This word is a bitwise OR of the flags described below.
The initial join style
is
TUBE_JN_ANGLE
TUBE_JN_CAP
TUBE_NORM_FACET
.
- TUBE_JN_RAW
-
Draw polycylinders, polycones, extrusions, etc. with no special treatment of the extrusion ends.
- TUBE_JN_ANGLE
-
Draw polycylinders, polycones, extrusions, etc. by extending the different segments until they butt into each other with an angular style.
- TUBE_JN_CUT
-
Draw polycylinders, polycones, extrusions, etc. by joining together the different segments and slicing off the joint at half the angle between the segments. A cap is drawn. Note that the slicing plane runs through the origin of the contour coordinate system. Thus, the amount of slice can be varied by offsetting the contour with respect to the origin.Note that when two segments meet at a shallow angle, the cut join style will potentially shave off a whole lot of the contour, leading to "surprising" results...
- TUBE_JN_ROUND
-
Joints will be rounded. Strictly speaking, the part of the joint above the origin will be rounded. The part below the origin will come together in an angular join.
- TUBE_JN_MASK
-
Mask bits. This can be used to mask off the bit field that defines the join style.
Extrusion Join Styles
- TUBE_JN_CAP
-
If this is set, a cap will be drawn at each end of the extrusion.
End Caps
- TUBE_NORM_FACET
-
A normal vector is generated per facet. Useful for having an extrusion have a "faceted" look, such as when extruding a square
- TUBE_NORM_EDGE
-
Normal vectors are generated so that they lie along edges. Useful for making angular things look rounded under lighting. For example, when extruding a hexagon and using this flag, the hexagonal extrusion will look (more like a) smooth perfectly round cylinder, rather than a six-sided shape.
- TUBE_NORM_PATH_EDGE
-
Normal vectors are generated so that they both lie on edges, and so that they interpolate between neighboring segments. Useful for drawing "spaghetti"
- TUBE_NORM_MASK
-
A mask useful for masking out the "norm" bits.
Automatic Normal Vector Generation
- TUBE_CONTOUR_CLOSED
-
If this bit is set, the contour will be treated as a "closed" contour, where the last point connects back up to the first. It is useful to set this flag when drawing closed shapes (such as extruded cylinders, star-shapes, I-Beams, etc. When drawing open extrusions (e.g. corrugated sheet metal), you don't want to set this flag.
Closed or Open Contours
Bugs
Multiple threads using GLE share a single global join style (although this should be easily fixable because GLE does
use a centralized graphics context).
Author
Linas Vepstas
See Also
gleExtrusion gleTextureModeSample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
gleSetJoinStyle