Volume and thickness constraints for airfoil case

[FaiqShahbaz]

In the tutorial the volume and thickness constraints were applied using telist and lelist, from which a straight line is drawn and divided in 10 segments. But what if the airfoil is not symmetric and has a very less camber, the same approach will result in error since that line will be outside the actual airfoil.
How to deal with this kind of situation?

i have set up constraints as below,
# setup the volume and thickness constraints
leList = [[1e-4, 0.0, 1e-4], [1e-4, 0.0, 0.1 - 1e-4]]
teList = [[ 0.992735 - 1e-4, 0.0017 - 1e-4, 1e-4], [0.998 - 1e-4, 0.002712 - 1e-4, 0.1 - 1e-4]]
where the last points of airfoil are as,
PS
0.968141 0.005908
0.982146 0.003613
0.992735 0.001700
SS
0.973434 0.010465
0.984387 0.006072
0.992735 0.002712

but since the the airfoil profile is unsymmetric as you can see the straight line wont work and there will be error projecting node.

[friedenhe]

In this case, you can put your leList and teList completely outside of the airfoil, for example, at y=-0.1. When pyGeo projects in the y+ direction, it will find two intersection points on the airfoil surface, it will use these two points for computing the thickness volume.