2011

X axis plus the current value of the SNAPANG system variable. For closed
polylines, the ruled mesh starts at the last vertex and proceeds backward along
the segments of the polyline. Creating a ruled mesh between a circle and a
closed polyline can be confusing. Substituting a closed semicircular polyline
for the circle might be preferable.
The ruled mesh is constructed as a 2 by N polygon mesh. RULESURF places
half the mesh vertices at equal intervals along one defining curve, and the
other half at equal intervals along the other curve. The number of intervals
is specified by the SURFTAB1 system variable. It is the same for each curve;
therefore, the distance between the vertices along the two curves differs if the
curves are of different lengths.
The N direction of the mesh is along the boundary curves. If both boundaries
are closed, or if one is closed and the other is a point, the resulting polygon
mesh is closed in the N direction and N equals SURFTAB1. If both boundaries
are open, N equals SURFTAB1 + 1, because division of a curve into n parts
requires n + 1 tabulations.
The 0,0 vertex of the mesh is the endpoint of the first selected curve nearest
the point you used to select that curve.
Selecting objects at the same ends creates a polygon mesh.
Selecting objects at opposite ends creates a self-intersecting polygon mesh.
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RULESURF | 1683