# Parabolic Curve

> 2.0

Entity type is `kA3DTypeCrvParabola`.

For the canonical definition of this curve and its corresponding parametric equation, see the “SerializeParabola” section of the*PRC Format Specification*.

The `A3DParameterizationData`struct specified by the `A3DCrvParabolaData::m_sParam`member specifies reparameterization and trim for the curve.

> In version 2.1 and earlier, values for parameterization named in the `A3DCrvParabolaData::m_cParamType`member are inverted compared to the corresponding values in the*PRC Format Specification*.

> 2.3

When `A3DCrvParabolaData::m_cParamType`is set to 1, X value must be taken as param2/sqrt(16*focus2+param2), and Y as corresponding value 2 * :c:member:`A3DCrvParabolaData::m_dFocal <A3DCrvParabolaData.m_dFocal>` * sqrt( fabs(X) / :c:member:`A3DCrvParabolaData::m_dFocal <A3DCrvParabolaData.m_dFocal>` ).

`A3DParameterizationData`allows for reparameterization and trim.

Returns

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

Structures

- `A3DCrvParabolaData`

Functions

- `A3DCrvParabolaGet()`
- `A3DCrvParabolaCreate()`

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