 Weta Digital took over duties for animating Iron Man during the forest duel from ILM . Guy Williams , Weta 's visual effects supervisor , said , " We shared assets back and forth with ILM , but our pipelines are unique and it 's hard for other assets to plug into it . But in this case , we got their models and we had to redo the texture spaces because the way we texture maps is different . " Williams said the most difficult part was re @-@ creating Iron Man 's reflective metal surfaces . 
