NAME
gleLathe - Sweep using a Z-axis shear to create an arbitrary contour along a helical path.
SYNTAX
void gleLathe (int ncp,
gleDouble contour[][2],
gleDouble cont_normal[][2],
gleDouble up[3],
gleDouble startRadius, /* spiral starts in x-y plane */
gleDouble drdTheta, /* change in radius per revolution */
gleDouble startZ, /* starting z value */
gleDouble dzdTheta, /* change in Z per revolution */
gleDouble startXform[2][3], /* starting contour affine xform */
gleDouble dXformdTheta[2][3], /* tangent change xform per revoln */
gleDouble startTheta, /* start angle in x-y plane */
gleDouble sweepTheta); /* degrees to spiral around */
ARGUMENTS
- ncp
-
number of contour points
- contour
-
2D contour
- cont_normal
-
2D contour normals
- up
-
up vector for contour
- startRadius
-
spiral starts in x-y plane
- drdTheta
-
change in radius per revolution
- startZ
-
starting z value
- dzdTheta
-
change in Z per revolution
- startXform
-
starting contour affine transformation
- dXformdTheta
-
tangent change xform per revolution
- startTheta
-
start angle in x-y plane
- sweepTheta
-
degrees to spiral around
DESCRIPTION
Sweep an arbitrary contour along a helical path. The sweep will be performed as a shear along the z-axis, so that the orientation of the contour is displaced, rather than translated, as the contour is swept.
The axis of the helix lies along the modeling coordinate z-axis.
An affine transform can be applied as the contour is swept. For most ordinary usage, the affines should be given as NULL.
SEE ALSO
gleSpiral
AUTHOR
Linas Vepstas ([email protected])