The quality option controls how many planar curves (aka planar guides) blending  

between the input sections are made by the implementation to constrain the  

output surface. More planar guides will result in a blend surface that has a  

better shape; however, the representation of the surface becomes more complex  

which results in larger storage requirements and larger evaluation times. The  

default value is 5. The value of 0 has a special meaning: In this case the  

output surface will coincide with the standard loft output for the same input  

sections and might have a significantly different shape from the surface  

produced for a quality value >=1.