# Helix Curve

> 2.0

Entity type is `kA3DTypeCrvHelix`.

For the canonical definition of this curve, see the “SerializeHelix01” section of the*PRC Format Specification*.

`A3DParameterizationData`allows for reparameterization and trim.

`A3DMiscCartesianTransformationData`allows for specific placement.

> `kA3DConstantPitch`and `kA3DVariablePitch`correspond to type 0 and 1 respectively in*PRC Format Specification*.

Returns

> `A3D_SUCCESS`on success, or an error code on failure

Structures

- `A3DCrvHelixPitchCstData`
- `A3DCrvHelixPitchVarData`
- `A3DCrvHelixData`

Enumerations

- `A3DEHelixType`

Functions

- `A3DCrvHelixGet()`
- `A3DCrvHelixCreate()`

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