globalStitch node

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The 'globalStitch' node modifies the positions of the outer rows and columns of control vertices on a set of NURBS surface to achieve a required position or smoothness continuity condition.

The attribute 'inputSurface' specifies a list of NURBS surfaces to be modified.

The attribute 'sc' requires corners of matching edges to be stitched. This operation will be performed before any of the other stitching options. The option matchKnots forces the ends of matching curve segments to be positioned exactly at knot values the alternative is to use the closest point will be used instead.

The attribute 'se' controls whether edges are stitched with positional continuity. The closest point option causes the edges to be stitched by matching a point on one edge to the closest point on the other edge. The alternative is for points separated by equal parameter intervals on each edge will be stitched together.

The attribute 'ssw' controls higher orders of stitching. Options are off, tangent (C1 continuity at common surface edges) and normal (surface normals on each edge are aligned, but the isoparms are not necessarily perpendicular.)

The attribute 'spe' specifies that partial surface edges are to be stitched. This means joins whose start or end points are not at surface corners on either edge.

The attribute 'maxSeparation' specifies the maximum separaion between two surfaces that will still be stitched.

The attribute 'sampling' specifies how densely the edge is sampled. A sampling of 1 means that each span on each surface is sampled at least 'degree' times. Higher values are a multiple of this sampling rate. A value of 1 is guaranteed always to be enough to ensure a solution, but the value can be increased to get a better fit in some cases.

The attribute 'modificationResistance' specifies how closely the CVs should match their original positions. A high value constrains the CV to be harder to move from its original position.

The attribute 'lock' can be used to ensure specific surfaces do not change at all during the fitting process.

CAUTION : No additional knots are inserted in to the NURBS surface. At times all the constraints cannot be met because the surface does not have the required number of control vertices.