# A3DCrvEvaluatePointAndNormal

A3DStatus `A3DCrvEvaluatePointAndNormal`(A3DCrvBase const *psCrv, A3DDouble dParameter, A3DUns32 uiNbSurfaces, A3DSurfBase **ppsSurfaces, A3DUns32 uiNbDerivatives, A3DVector3dData *psPointAndDerivatives, A3DVector3dData *psNormal)
  `A3DStatus` A3DCrvEvaluatePointAndNormal(`A3DCrvBase`* psCrv, `A3DDouble` dParameter, `A3DUns32` uiNbSurfaces, `A3DSurfBase`** ppsSurfaces, `A3DUns32` uiNbDerivatives, `A3DVector3dData`* psPointAndDerivatives, `A3DVector3dData`* psNormal)

  Function to evaluate a point and the derivatives of a curve at a parameter, then the normal of this point to each of the given surfaces.

  ## Derivatives are stored in the following order:

      \li  With uiNbDerivatives = 0: Point
      \li  With uiNbDerivatives = 1: Point, First Derivative
      \li  With uiNbDerivatives = 2: Point, First Derivative, Second Derivative

  psPointAndDerivatives size must be equal to (uiNbDerivatives+1):

  - size = 1 if uiNbDerivatives=0

  - size = 2 if uiNbDerivatives=1;

  - size = 3 if uiNbDerivatives=2; psNormal size must be equal to the uiNbSurfaces, the number of given surfaces. Life time of psPointAndDerivatives and psNormal must be handled by the user.

    > 8.2

    > The number of derivatives must be less than or equal to 2.

  Returns

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

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