gleLathe - Sweep using a Z-axis shear to create an arbitrary contour along a helical path.
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 */
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
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.
gleSpiral
Linas Vepstas (linas AT linas DOT org)