The angle of the neck and the twisting of the forearm are made with the range of motion of the drawing doll turned off. I tried it with my own body, but it is within the limit of the range of motion of humans. 首の角度と前腕の捻りについてはデッサン人形の可動域をオフにして作ってます。自分の体でためしたのですが人間の可動域限界いっぽ手前ぐらいに収めてます。