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Built-in Mathematica Symbol

SplineWeights

SplineWeights
is an option for B-spline functions and graphics primitives that specifies weights of control points.

With SplineWeights->array, each element of array gives the weight for the corresponding control point in the array of control points specified.

Here all weights are equal:

This uses a larger weight for the third control point:

Here all weights are equal:

This uses a larger weight for the third control point:

Perfect circle using B-spline curve with weights:

Pipe section using B-spline surface with weights: