LOFT:

Start and stop with tangent.

There is two ways to define the tangent:

Example:

The yellow surface is the loft shape.

The left side (circular) has been made with the first method:

• The green arc is the reference edge (belonging to the grey element).

• The purple arc is the curve of tangency.

The right side (rectangular) has been made with the second method:

• The red curve is the reference curve (buit beforehand).

• The blue curve is the curve of tangency (built beforehand).

More the curve of tangency is far from the reference curve (or edge), more the tangency extend on the loft shape.