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The Twisted-perspective Sheep from Dibirké 3D Model
In the rock art of the Recent and Final cattle periods of the Ennedi, drawings of living beings are usually developed according to the different principal profiles of the main body parts. This drawing technique introduces systematic distortions, typical of the studied pastoral styles. The painted silhouette of the Dibirkè sheep can be only approximate by posing the rigged 3D model of a Sahelian sheep (a lactating ewe). It is not possible to model such silhouette without overriding the natural rotation limits of the articulated skeleton incorporated in the model. In animal depictions, the lateral view regularly twists to the back perspective to show the swollen udders of ewes between the hind legs. The tails of the painted sheep (show in the YRD colour space) participate to the principal lateral profile to allow for an unobstructed view of the udder. This template impedes the correct drawing of the rump and the low insertion of the tail.