As the previous two step texture mapping algorithm does not suit the annular objects

a texture mapping algorithm for the annular objects is proposed.The torus is chosen as the media surface

whose upside and underside are mapped respectively with two pairs of the same style textures applying restraint of equal ratio of areas.The two textures are stitched on the torus using the interpolation technique to avoid the joint.Finally

the media surface normal method is adapted to map the texture from the torus to the object’s surfaces.The experimental results show that the algorithm can be used to map the texture from the plane to most of the Annular Object’s surfaces

on which the rendered texture has little distortion and looks continuous.The proposed method can be used in realistic rendering or VR system to map texture onto the surfaces of annular objects.