Hello,

I'd like to apply twistedbone weights to polygon2d from GDscript but am having problems.

If i paint the weights in the editor, the Polygon2D's bones property will be array that looks like this: [twistedbone1,[1,1,1,1,1,1], twistedbone2,[0,0,0,0,0]] and I thought it would be trivial to set in code. But when I try to do it, weird things occur. In fact, this happens:

var bones_array = [skeleton.get_child(0), weights]

polygon.bones = bones_array

print(bones_array)

Result:

[Twisted_Bone2D:[Bone2D:24122], [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]

print(polygon.bones)

Result:

[[Bone2D:24122], [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]

Then when I open the weight paint screen, the right hand column that shows the bones only displays [Bone2D, instead of the usual TwistedBone_1.  Weights appear set,  but when i rotate the twistedbone in the editor, the polygon doesnt move with it.

So, to summarize, it seems like the TwistedBone, when set into the polygon.bones array, is being turned into [Bone2D]. Is there any way around this? I'd be fine with just a hack to get it to work.

Cheers

Thanks for the reply, Twigleg!

I am indeed setting on the polygon. I tried polygon.set('bones', bones_array), but the exact same result occurs. In GDScript it's likely that polygon.bones = is just a convenience syntax for set.

This is the result of printing polygon.bones after doing polygon.set('bones', bones_array):

[[Bone2D:479641], [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]

Any other suggestions? Much appreciated

This is the erroneous result

This is what the result should look like (from when I do it manually)

Hmm.. maybe try clear_bones and https://docs.godotengine.org/en/stable/classes/class_polygon2d.html#class-polygon2d-method-add-bone? (I can’t add another link for some reason…)

That would be strange if that fixed it though, as I suspect it just sets the bone weight under the hood. The only thing I can think of that might fix it in this case would be setting the node again via the node path might bind it to the TwistedIK2 bone rather than the Bone2D node.

okay -- this does work! because add_bone uses a path so it must be doing it internally

polygon.clear_bones()

polygon.add_bone(bone.get_path(), weights)

Thank you so much!

Great! I’m glad that worked and am happy to help 🙂