gleLathe(3GLE) GLE gleLathe(3GLE)NAMEgleLathe - 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 per‐
formed as a shear along the z-axis, so that the orientation of the con‐
tour 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 (linas@linas.org)
GLE 3.0 gleLathe(3GLE)
