| | Technically speaking, a 2-sided material is a material that is treeated by the renderer as if it used both left- and right-handed winding order. To this effect, the [[Poser Poser 4]] renderer treats all materials as 2-sided materials.
The term is also used to apply to surfaces that have been made with dual layers facing opposite normals. This technique is most often applied to cloth. Large surface areas of 2-sided materials can show problems in rendering as it's quite common for the underlying surface to poke through the outer one, and if, as in Poser, all surfaces are treated as true 2-sided materials when rendering, then a disparate surface is often seen where the two layers seem to vie for dominance while occupying the same place.
Additionally, only true one-sided materials can be counted on to behave properly in the [[Poser Poser 5]] cloth room.
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