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== Turbo Pipeline (Fast) == [[File:Turbo Pipeline.jpg|none|thumb|The Turbo pipeline uses fast Hull + Domain shaders to discard most non-visible fur.]] Depending on view range, the Turbo Pipeline is typically 25% to 100% faster than the Fallback Pipeline, despite also having much higher quality. It can render up to 32 layers of fur. This speed comes from its use of Hull + Domain shaders to discard any fully non-visible triangles before the Geometry shader stages. This prevents the relatively slow Geometry shaders from loading into GPU memory if they aren't needed. Hull + Domain shaders are typically used for tesselation, and are thus built for speed. ''However, the Turbo Pipeline does '''not''' use them for tesselation.'' Instead, it uses the Hull + Domain shaders as a very fast all-or-nothing kill-switch. When it wants to discard an entire triangle, the Hull shader specifies a multiplier of 0, which discards it. Otherwise it specifies a multiplier of 1 and the triangle is then passed completely as-is by the Domain shader to the Geometry shader. The Geometry shader is then resposible for making copies of the triangle for each visible fur layer, and discarding the rest. Because even discarding triangles still takes some time, selecting a higher maximum layer limit comes with a performace hit, even when less layers are being rendered. However, this hit is relatively moderate (around 5% going from 24 to 32 layers), and less than the Fallback Pipeline. '''''The Turbo Pipeline is the recommended pipeline.'''''
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