sd%chem@UCSD.EDU (Steve Dempsey) (03/15/88)
When Z buffering is enabled, depthcueing and clipping of line segments is not always done properly. When a depthcued line is zbuffered, all of the pixels of the line are drawn at the same intensity, which appears the be the intensity of the closest pixel. It appears that only the first pixel is depthcued, and then all of the remaining pixels are given whatever color was determined for the first pixel. This bug is most noticable when long lines are drawn from the hither to yon plane. Note that if the line is drawn as a series of short segments then each segment will be drawn at a different intensity and you might not notice the problem. In addition, some depthcued and zbuffered lines are not clipped properly. As the hither plane moves behind one endpoint of the line segment, the entire segment disappears.