This op provides a set of operations applicable to the parametric space of spline curves and surfaces. The parametric space, also known as the “domain” of a NURBS or Bezier primitive, is defined by one basis in the U direction and, if the primitive is a surface, another basis in the V direction. The size of the domain is given by the values of the knots that make up the basis.
The Basis op contains both ratio-preserving and non ratio-preserving operations.
If the basis reparameterization does not change the distance ratios between knots, the shape of a NURBS primitive is not affected. If the ratios are not preserved; however, a NURBS primitive will change shape in the area influenced by the modified knots. Additionally, if the primitive is a NURBS or Bezier surface, any profiles it may contain will be affected as well.
Subset of spline primitives to operate on.
Edit the U Basis
Enables and disables transformations of the U basis below.
Edit the V Basis
Enables and disables transformations of the V basis below.
Does not change the U basis.
Distributes all knots evenly.
Computes knot ratios based on primitive chord length.
Similar to chord length, useful for sharp turns.
Edit knots of first spline primitive individually.
Same as above but copy knots to all other primitives.
Shift clusters of knots within the basis.
Approximate Arc Length
Computes knot ratio based on an approximate primitive arc length.
Editable field of knots in ascending order.
Reads knots of first primitive into the field above.
Area of the unit U domain to be shifted.
Amount and direction of shift in knotslide.
Indicates whether bases should be concatenated.
New origin of the U basis.
New length of the U basis.
Multiplier applied to basis at its origin.
Enables and disables raising of the basis order.