Glossytranslucent bf values

[Fox]

What do the bf values do in Glossytranslucent material, they are not changeable in Blender exporter?

scene.materials.Material2549641317400.type = "glossytranslucent"
scene.materials.Material2549641317400.kd = "0.2 0.2 0.2"
scene.materials.Material2549641317400.kt = "1 1 1"
scene.materials.Material2549641317400.ks = "0.047 0.047 0.047"
scene.materials.Material2549641317400.ks_bf = "0.5 0.5 0.5"
scene.materials.Material2549641317400.uroughness = "0.3"
scene.materials.Material2549641317400.uroughness_bf = "0.05"
scene.materials.Material2549641317400.vroughness = "0.3"
scene.materials.Material2549641317400.vroughness_bf = "0.05"
scene.materials.Material2549641317400.ka = "0 0 0"
scene.materials.Material2549641317400.ka_bf = "0 0 0"
scene.materials.Material2549641317400.d = "0"
scene.materials.Material2549641317400.d_bf = "0"
scene.materials.Material2549641317400.index = "0 0 0"
scene.materials.Material2549641317400.index_bf = "0 0 0"
scene.materials.Material2549641317400.multibounce = 1
scene.materials.Material2549641317400.multibounce_bf = 0

[Dade]

They are the back face values.

[B.Y.O.B.]

They are available in Blender if you enable the "double sided" option:

[Fox]

Aa i see, how did i not think of that.