Usually the texture or color of a shader can only be expressed on the front side; the back side is white; but the color and texture of the front and back sides of many objects are the same, such as weaving, flags, and a thin iron sheet; the twoside node can only control the front side. The colors or graphics on the reverse side are not suitable for materials with clear textures; can anyone share with me the method of a similar case?
thank you very much!

Hello
You can extrude your geometry and make 2 group for front and back with different texture
or in rendering , i know for Redshift their is a RS state node than can switch the shader depending of the front or back
must be one also for Mantra or Karma
but i doubt you could do it in the viewport opengl ...