HiddenLineDrawingSegment Properties

The actual curve geometry

The SideFill fields are only valid for visible curves. With respect to the HiddenLineDrawing, the region to the left (or right respectively) of this curve is described by CurveSideFills[0] or CurveSideFills[1], respectively. If exactly one of these regions is empty this is a scene silhouette. If this region contains a surface it is either a surface which in 3-D is adjacent to this edge or it an surface that is further away from the camera, we call this a shadow surface. unknown is used for unset values and for projecting curves

Index of this curve in HiddenLineDrawing.Curves.

Returns true if this curve is a scene silhouette.

This curve is a sub-curve of the returned HiddenLineDrawingFullCurve object.

Returns the segment's visibility