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.

AUTHOR

Linas Vepstas (linas@fc.net)

NAME

SYNTAX

ARGUMENTS

DESCRIPTION

SEE ALSO

AUTHOR