These parameters are used to control the shape of a double-sided type blend. See examples below:
Middle Bulge: This parameter determines how much the surface (between the 2 blends) will bulge up in the middle. The value is interpreted as a percent of the distance between the two blending curves.
Start Blend Size: This parameter tells it how much of a blend to create on the starting side. This is a percent of the distance also. 1% gives a very small tight blend and 20% gives a fairly large blend to the middle section.
End Blend Size: This parameter tells it how much of a blend to create on the ending side.
Split Double-Sided Blend: When this option is selected, it will split up the resulting blend into 3 separate (but connected) faces. There will be 2 faces on the ends, and a face in the middle. When this option is turned off, the blend will be created as a single face.
Fade To Normal Blend: If this flag is set to true, one end of the blend will be a Double-Sided Blend while the other end is a normal blend and the surface between them fades from a double sided blend to a normal blend.
Reverse Fade Direction: If true we reverse the direction of the fade so that the double-sided end and normal blend end now are on the opposite sides of the blend.
Fade Weight: This controls how quickly the fade happens. A larger number means that the double sided blend is has more strength than the normal blend. A smaller number means the converse.
Double Sided Blend with 0% Middle Bulge, 10% Start/End Blend
Size

Double-Sided Blend with -5% Middle Bulge, 5% Start/End Blend
Size

Double-Sided Blend with 2%
Middle Bulge, 2% Start/End Blend Size

Double-Sided Blend with "Fade To Normal Blend" at 50% Fade Weight and
0% Middle Bulge, 10% Start Blend Size, and 5% End Blend Size.

Double-Sided Blend with "Fade To Normal Blend" at 90% Fade Weight and
0% Middle Bulge, 10% Start Blend Size, and 5% End Blend Size.

Same Parameters as above with "Reverse Fade Direction" checked.
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