GH+Kangaroo+SSI+GSA : Principal Stress Grid

Another exercise for the GHL2 workshop, displaying the Principal Stress Curve of a mesh generated using Kangaroo.

In the words of Jon Mirtschin: "The Principal stress directions should give indications of structural grid alignment. It indicates the directions of greatest axial thrust. Material performs best under direct axial stress rather than shear/flexure. Think of a truss rather than a beam. A truss you are arranging the material in a geometry where everything primarily is loaded in the longitude direction. A deep beam has lots of material in areas where it's not really needed (or not used to full advantage). So a grid aligned on a surface according to principal stress should be more efficient than one that is not."