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3.1.5.5 Transparency

Both PSTricks and TikZ/PGF support polygon options that have the effect of making the polygon appear transparent. For PSTricks, keyword transpalpha was used during initial development of transparency features, and opacity was adopted later. Sketch honors both. TikZ/PGF uses opacity only. When transparent polygons are in the foreground, objects behind them (drawn earlier) are visible with color subdued and tinted. The hidden surface algorithm of sketch works well with such transparent polygons.

Note that cull=false must be used for rear-facing polygons to be visible when positioned behind other transparent surfaces.