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This node will insert a knot, (aka isoparm) at a particular parameter value(s) in either the U or V direction. As a result, the number of spans and CVs in that surface direction will increase in the area where the knot is inserted. You can insert up to "degree" knots at a parameter value that isn't already an isoparm. eg. for a degree 3 surface, you can insert up to 3 knots. The more knots inserted at a parameter (default is 1), the more "pull" the new CVs have. eg. if you insert 3 knots into a degree 3 surface, a row of CVs will have the surface passing directly through it.

Use this operation if you need more CVs in a local area of the surface. Use this operation if you want to create a corner in the surface. This node is also useful if you have aligned an edge of the surface at a specific tangent and you want the ability to change the shape of the surface in that area, while maintaining the tangent. In this case, you can insert an isoparm near (but not at) the edge, then leave the last two rows of CVs (which define the edge tangent) where they are, and modify any other CV to change the surface shape.

Note: A single insertKnotSurface node cannot insert in both directions at once; you must use two nodes to do this.

Node nameParentsMFn typeCompatible function sets

Related nodes

ffBlendSrfObsolete, roundConstantRadius, extendSurface, offsetCos, avgSurfacePoints, alignSurface, bevel

Attributes (7)

addKnots, direction, inputSurface, insertBetween, numberOfKnots, outputSurface, parameter

Long name (short name)TypeDefaultFlags
inputSurface (is) nurbsSurfaceNULLoutputinputconnectable
The input surface
parameter (p) double0.0arrayoutputinputconnectablestorablekeyable
Parameter value(s) where knots are added
numberOfKnots (nk) integer1arrayoutputinputconnectablestorable
How many knots to insert
addKnots (add) booltrueoutputinputconnectablestorable
Whether to add knots or complement. Complement means knots will be added to reach the specified number of knots.
insertBetween (ib) boolfalseoutputinputconnectablestorable
If set to true, and there is more than one parameter value specified, the knots will get inserted at equally spaced intervals between the given parameter values, rather than at the parameter values themselves.
direction (d) enum1outputinputconnectablestorablekeyable
Direction in which to insert knot: 0 - V direction, 1 - U direction
outputSurface (os) nurbsSurfaceNULLoutputconnectable
The output surface