#Pointwise-extrude-smooth_factors
##Explicit range: 0~10 prevent crossing of grid lines.
##Implicit range: 0~\infty, but double the value of explicit.
##Kinsey Barth prevent crossing of the grid lines in the marching direction.
range: 3~\infty when the front includes severe concavities, default value is 0(OFF).
##Volume range:0~1 determine how rapidly the grid clustering on the front relaxes as the extrusion steps forward.