The mode of creating roundings (fillets) with variable radius can be called in the Edge Blend command using the Variable (Circular) button located in the upper part of the parameters window.

This type of rounding creates a surface of a variable radius. A list of critical points is defined. A certain value of the rounding radius can be set at each of these points. Each point position is defined as percentage of the total edge length. Initially, this list contains two points at 0% and 100% of the edge length.

If several edges are selected, then the point positions are defined as percentage of the total chain length for all consequently adjoined edges. The edge joints are not required to be smooth. A single direction is used for the whole chain of edges. It is defined by the direction of the first edge in the chain.

When defining this type of blending along a closed loop of edges, always make sure that the start and end point radii are equal.

The change in the rounding radius between points can be Linear or Smooth. In the Linear case, the change in the radius is described with a broken line (the radius changes linearly from one point to another). In the Smooth case – the change in the radius is specified by a curve having a horizontal tangent at the start and end points.

Linear change of radius |
Smooth change of radius |

A special mode is provided for processing certain cases, that allows specifying own variable rounding parameters for each individual edge. When processing a smooth chain of edges in this mode, make sure the radii are equal at the meeting ends of the adjacent edges.

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