How to loft wires defined in independent planes?

[lalebarde]

Hi,

Here, I could loft from two wires, the first one defined in the workplane, and the second one in a workplane obtained by applying transformed(rotate=(0, 0, 0), offset=(0, 0, 0)) to the first one.

But my use case is to loft wires defined in independent planes defined with:

cq.Workplane(cq.Plane(p[i], n[i], h[i]))

and not relative one to the other. Here is the simplified pseudo code:

import cadquery as cq
wp1 = cq.Workplane("XY").rect(1,2).workplane()
wp2 = cq.Workplane("YZ").rect(1,2).workplane()
wp1.add(wp2) # adds wp2 to the wp1 stack in order to have two wires
result = wp1.loft(combine=True)

Result is:

ValueError: more than one wire is required

In addition, add is defined for class cadquery.CQ(obj), not class cadquery.Workplane(inPlane, origin=(0, 0, 0), obj=None). Surprisingly, wp1.add(wp2) does not raise an error.

I have considered several solutions:

• Reuse a relative workplane with transformed(rotate=(0, 0, 0), offset=(0, 0, 0)) like I did in the link on top of this post, but I am not happy with it because my workplanes are defined with absolute origins and normal vectors, built from rotation matrix of the kind of class cadquery.Matrix(matrix=None). This is complex and not wanted.

• Hack the stack like above, but I don't know how. Nevertheless, it is the desired solution.

Is it possible and how please? Alternatively, being able to use transformed(rotate=(0, 0, 0), offset=(0, 0, 0)) with a class cadquery.Matrix(matrix=None) would simplify the first solution.

[adam-urbanczyk]

Currently add does not merge ctx.pendingWires which is where wires are taken from for lofting. It could be a bug or a feature (TBD). You can merge wires by simply extending the list:

wp1.ctx.pendingWires.extend(wp2.ctx.pendingWires)
res = wp1.loft()

[lalebarde]

Great, thank you Adam, and I purge the pendingWires after the loft and before the next iteration:

        wp1.ctx.pendingWires = []
        wp2.ctx.pendingWires = []