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The resolution parameters for line drawings are the maximum number of straight line segments used to define a curved line (MLX) and the maximum number used for a straight line (MX). Hidden line removal removes an entire segment; low resolution may result in visible gaps in drawings with opaque zones. The two resolutions can be specified independently. The default is 80 points for both straight and curved lines. The actual number used in drawing a line depends on the length of the line and the minimum distance between points. The rendering time for line drawings is directly proportional to the number of points processed and hence to the resolution settings. The maximum resolution accepted by Sabrina is 500 points for both straight and curved lines.
Lines and curves are initially split into segments of length U, where U has a default size of 0.1, and may be changed by resolution user. For each line or curve, the segment length is adjusted so that the number of segments is between 0.4 M and M, where M is MX or MLX, as appropriate.