As can be seen on the screen shot, I want to animate first folding the top right triangle and then along the center line of the sheet using the 2nd bigger bone. and then a third fold of the left side triangle. However when I do my second fold the whole sheet scrambles up. Some of the vertices from the two assigned grouped overlap, so I am not sure if this is the problem for blender. What is the correct way to make this work, or maybe it is just not possible in Blender?
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1$\begingroup$ Vertices should only be 100% assigned to a single bone. Remove the influences of the large bone from the selected vertices. $\endgroup$ – Leander Nov 17 '19 at 12:26
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1$\begingroup$ And the triangle bone should be child of the centerline bone. $\endgroup$ – josh sanfelici Nov 17 '19 at 13:09
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$\begingroup$ You might also consider using a method somewhat like this $\endgroup$ – Robin Betts Nov 17 '19 at 17:36
Assign only the needed vertices (tips) for each bone as follows:
And then you should fold it beautifully.