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Hidden-surface algorithms can be used for hidden-line removal, but not the other way around. Reif and Sen [17] proposed an O(log 4 n)-time algorithm for the hidden-surface problem, using O((n + v)/log n) CREW PRAM processors for a restricted model of polyhedral terrains, where v is the output size.
[citation needed] When referring to line rendering it is known as hidden-line removal. [citation needed] Hidden-surface determination is necessary to render a scene correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible.
Hidden lines are particularly useful when viewing an object from an angle where the visible only lines do not have much information. In a computer drawing application the option may be referred to a wire frame with hidden edges. [6] The hidden edges would be dashed lines. A wire-frame image using hidden-line removal
Hidden-line removal is typically used with such a representation. Static hidden-line removal does not update which lines are hidden during rotation, but only once the screen is refreshed. Dynamic hidden-line removal continuously updates which curves are hidden during rotations.
Hidden line removal (HLR) is an important aspect of creating an accurate 2D representation from a 3D model. Using HLR, the converted model only displays those parts visible from a given perspective; hidden (or occluded) edges normally included in a 3D model representation are removed, or drawn in a line style that indicates their obscured position.
In wire-frame rendering, back-face culling can be used to partially address the problem of hidden-line removal, but only for closed convex geometry. A related technique is clipping, which determines whether polygons are within the camera's field of view at all.
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Multi-core Hidden Line Removal engine; VisualARQ 1.4 2011, July 25 Gable/hip roofs; Jog sections; Realtime sections; Glass muntins; Awning/hooper/hung windows; VisualARQ 1.5 2012, February 9 Rhinoceros 5.0 (32 and 64-bit) support; Real-time plan views; New display mode 'Hidden'. VisualARQ 1.6 2012, July 24 Hatched section views