While the above curve inference handles a majority of sketched curves we provide, some additional features for users to. Create strokes that do not fi t our curve types and settle ambiguous situations. Occasionally a user might wish to construct. A shell projection curve with a straight line or conversely, a tangent plane curve with considerable curvature. As the tangent. Plane curve - type is a planar variation of a, shell projection we allow the user to toggle our default interpretations using. The shift key. More precisely if the, algorithm were to choose a shell projection curve and the shift key, was pressed the. Result would be swapped with a tangent, plane curve and viceversa. Users can explicitly indicate curve types by mode switching. But our strength lies in presenting a pure sketching interface where our algorithm enables a creative work fl ow that is not. Impeded by consciously mode-switching prior to placing a stroke.
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