get_panel_wcv

Produces a compact array with weights for bilinear interpolation, where aN,aM in [0,1] are distances in the chordwise and spanwise directions such that:

• (aM,aN)=(0,0) –> quantity at vertex 0
• (aM,aN)=(1,0) –> quantity at vertex 1
• (aM,aN)=(1,1) –> quantity at vertex 2
• (aM,aN)=(0,1) –> quantity at vertex 3