gleLathe
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Name

gleLathe — Sweep using a Z-axis shear to create an arbitrary contour along a helical path.

C Specification

void gleLathe (int ncp , gleDouble contour[][2], gleDouble cont_normal[][2], gleDouble up[3], gleDouble startRadius , gleDouble drdTheta , gleDouble startZ , gleDouble dzdTheta , gleDouble startXform[2][3], gleDouble dXformdTheta[2][3], gleDouble startTheta , gleDouble sweepTheta );

Python Specification

gleLathe ( contour[][2], cont_normal[][2], up[3], startRadius , drdTheta , startZ , dzdTheta , startXform[2][3], dXformdTheta[2][3], startTheta , sweepTheta ) →  None

Parameters

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

Python Sample Code

gleLathe
  • OpenGLContext/scenegraph/extrusions.py Ln#115


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