Is a loft not a normal shape?

[raydeleu]

Playing around with shapes created using the loftWith function I found some strange behaviour:

• using the .shell() function on a loft created with {ruled: false} seems to fail with the message "shape has not type"
• using the . shell() function on a loft created with { ruled: true} has unpredictable behaviour. The code below combines a lofted shape with a basic cylinder. If you play around with the radius of the cylinder, sometimes the code runs fine, sometimes it fails graciously (omitting the .shell() or sometimes with a kernel error.

const main = ({ sketchCircle, sketchRectangle }) => {
  
  let loft = sketchRectangle(5, 10).loftWith([
    sketchCircle(8, { origin: 10 }),
    sketchRectangle(5, 10, { origin: 20 }),
  ],{ruled:true});

// if radius of cylinder is 2, shape is absorbed in loft
// shell fails, 
// if radius is 3, you get message "shape has not type, it is null"
// if radius of cylinder is 10, shell succeeds, 
// of radius is 8 you first see a combination of shapes, then 
// the loft disappears? 
// if { ruled: false} the result are kernel errors

  let cylinder = sketchCircle(6).extrude(20)
  loft = loft.fuse(cylinder)

  loft = loft.shell(-0.5,(f) => f.inPlane("XY",[0,0,20]))

  return loft
};