API Reference > geometry-core > Curve > DirectSpiralTypeName DirectSpiralTypeName Type alias This is the set of valid type names for "direct" spirals. "Direct" spirals can evaluate fractionToPoint by direct equations, i.e. not requiring the numeric integrations in "Integrated" spiral types. DirectSpiralTypeName = "JapaneseCubic" | "Arema" | "ChineseCubic" | "HalfCosine" | "AustralianRailCorp" | "WesternAustralian" | "Czech" | "MXCubicAlongArc" | "Polish" | "Italian" Defined in curve/spiral/TransitionSpiral3d.ts Line 37 Last Updated: 12 June, 2024