Generates a quadratic line of nodes from three nodes.
Begin fill-in from this node location. If
P, graphical picking is enabled and all remaining command fields are ignored
(valid only in the GUI).
Intermediate or guiding node. Quadratic curve will pass through
NINTR may have any node number
and any location. If the quadratic line also generates a node with number
the generated location overrides the previous
End quadratic fill-in at this node location.
NFILL nodes between
NFILL must be positive.
Node number assigned to first filled-in node (defaults to
Add this increment to each of the remaining filled-in node
numbers (may be positive or negative). Defaults to (
NFILL + 1), i.e., linear interpolation.
Peak location factor. If
the peak of the quadratic shape occurs at the
If 0.0 <
PKFAC < 0.5, the peak occurs to
NODE2 side of the
If 0.5 <
PKFAC < 1.0, the peak occurs to
NODE1 side of the
Defaults to 0.5.
Generates a quadratic line of nodes (in the active coordinate system) from three nodes. The three nodes determine the plane of the curve and may have been defined in any coordinate system. Any number of nodes may be filled-in and any node number sequence may be assigned.
The quadratic line feature uses three nodes (
NODE2) to determine the plane of the curve. The curve passes through the three
points, beginning from
NODE1, through the intermediate
(or guiding) point
NINTR, and toward
Generated nodes are also quadratically spaced. If the guiding node number is within the set being generated, it will be relocated according to the quadratic spacing.
The peak location factor is used to determine how the quadratic fits
through the three points. Various nodal progressions can be obtained by different
PKFAC and the guiding node location.
If the guiding node is at mid-length between
0.707 will ensure that all generated nodes fall within the
In the limit, as
PKFAC approaches 0.0, the peak
approaches the line through
an infinite distance from
NODE1. The QUAD command
generates quadratic lines of nodes, which in turn may be used as a base line
for generating irregular surfaces of nodes (by repeating [*REPEAT],
generating [NGEN, NSCALE], etc.). Irregular
surfaces may also be generated with the meshing commands.