Blade rendering with Hull{}

[akey7]

A number of folks have asked for CAD files of the IEA 15-MW blade. WISDEM can generate the coordinates at arbitrary positions along the blade, so I figured I could do this.

If given a number of objects separated in space, OpenSCAD can connect them with the Hull() {} command. So, I am generating a very dense set of spanwise slices and airfoil coordinates of the blade. I have everything in a final numpy array, I just need help with the OpenSCAD commands. I bet you could take care of this fairly quickly.

I extracted all of the WISDEM code that was speckled around different modules and put them all together in the blade-branch of the new repo:
https://github.com/IEAWindTask37/windio2cad/tree/blade/blade

At the bottom of the lofted_blade.py file, I have some notes for what OpenSCAD needs to do:
https://github.com/IEAWindTask37/windio2cad/blob/blade/blade/lofted_blade.py#L167

So, I think we just need to create a polygon of the airfoil shapes, or a polyhedron with epsilon-thickness, and OpenSCAD will combine them with the Hull-command. With regards to the polygon/polyhedron, I’m a little confused about 2-D shapes in OpenSCAD, and whether they can be placed in an arbitrary plane in 3-D space. Let me know if this makes sense to you. I’m not always positive that I’m using the correct terms.