True (alpha) True transparency uses the hardware alpha planes. Although the resulting visual effect is
superior to fill patterns, true transparency is much slower to draw (especially for large
models) since all geometry must be sorted from back to front prior to each redraw.
Fill Pattern Fill pattern or screen-door transparency uses polygon fill patterns to control where polygons
are drawn (typically a fine grid specifying on and off). EnSight provides three patterns that
yield varying degrees of pseudo-transparency.
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