gleLathe.3gle - Man Page
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 (linas@linas.org)