gleLathe3gle
Sweep using a z-axis shear to create an arbitrary contour along a helical path.
Usage
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 |
Overview
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.
Releases
Unchanged in 12 releases since Debian 3.0 (Woody).