From Bjorn Blessing, "I got bored of the constant reports of “missing chunk 0xA08A” when reading 3ds-files. After a bit of research I discovered that this property is related to the advanced transparency settings for the material in 3D studio. In this case the falloff parameter. These controls affect the opacity falloff of a transparent material. And the property chooses whether falloff is in or out. I have added the property to the file reader BUT no changes are made to make this property propagate into the osgMaterial. But at least we get rid of this annoying error message."