This paper presents two models of texture of carbon materials possessing porosity. For both models, R-MAX, R-INT and R-MIN values of reflectance have been calculated by modified Ting＇s 3A method [Ting, F.T.C., 1978. Petrographic techniques in coal analysis. In: C. Karr (Ed.), Analytical Methods for Coal and Coal Products, Vol. I. Academic Press, New York, 1978, pp. 3-25]. It has been found that the reflectance indicating surface (RLS) for the studied models of texture changes from a biaxial negative up to a biaxial positive one (the type A texture) depending on the shape and size of pens. In particular case, for the type B texture and the isometry of pores, a uniaxial negative RIS is merely obtained.