# A3DSurfEvaluateNormal

A3DStatus `A3DSurfEvaluateNormal`(const A3DSurfBase *pSurf, const A3DVector2dData *pUVParameter, A3DVector3dData *pNormal)
  `A3DStatus` A3DSurfEvaluateNormal(const `A3DSurfBase`* pSurf, const `A3DVector2dData`* pUVParameter, `A3DVector3dData`* pNormal)

  Function to evaluate a normal on a surface.

  Parameters

  > pSurf: The input surface.

  > pUVParameter: The input UV point to evaluate the normal of the surface.

  > pNormal: The normal of the surface at the UV parameter.

  Returns

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

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