A3DSurfEvaluateNormal
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A3DStatus
A3DSurfEvaluateNormal(const A3DSurfBase *pSurf, const A3DVector2dData *pUVParameter, A3DVector3dData *pNormal) A3DStatusA3DSurfEvaluateNormal(constA3DSurfBase* pSurf, constA3DVector2dData* 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_SUCCESSon success, or an error code on failure
