High Quality Content by WIKIPEDIA articles! Hidden line removal is an extension of wireframe rendering where lines (or segments of lines) covered by surfaces are not drawn. This is not the same as hidden face removal since this involves depth and occlusion while the other involves normals. A commonly used algorithm to implement it is Arthur Apple's algorithm . This algorithm works by propagating the visibility from a segment with a known visibility to a segment whose visibility is yet to be determined. Certain pathological cases exist that can make this algorithm difficult to implement. Those cases are (i) vertices on edges and (ii) edges on vertices and (iii) edges on edges. This algorithm is unstable because an error in visibility will be propagated to subsequent nodes (although there are ways to compensate for this problem).

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