Running the attached RIB under Pixie SVN (r1169) throws a very long series of "Too many eyesplits" errors.
Is this an architectural problem with the way Pixie is structured, or it bailing out of the eyesplit routine too early? I wouldn't have filed a bug on this, except that other renderers work properly with it--BMRT renders it, as does 3Delight; Aqsis gives a similar error "WARNING: Max eyesplits for object "unnamed" exceeded". Moving the camera back and/or decreasing the displacement bounds allows the render to proceed.
The original files are from http://www.edit.ne.jp/~katsu/rms_tree.htm; I fixed the line endings so they'd be interpretable and hacked it down to test-case size. It originally included some astonishing abuse of the shading language, but that's been edited out as well in the included sample.