The ocean floor is generated by measured points within NfDesign.
    Seaweeds are created referring to XYZ positions and heights of seaweeds computed by another program.
    Textures are mapped on generated 3D objects for seaweeds.
    Sea level is a 3D object having 3D effects and half-transparent material to reflect the celestial sphere with texture.
    Rendering is put in practice by ray-tracing method.

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