The animators also employed subsurface scattering—developed by Pixar co-founder Edwin Catmull during his graduate student days at the University of Utah in the 1970s—to render surfaces in a more lifelike way. This would be the first time that subsurface scattering would be used in a Pixar film, and a small team at Pixar worked out the practical problems that kept it from working in animation. Catmull asked for a short film to test and showcase subsurface scattering and the result, "Geri's Game" (1997), was attached alongside "A Bug's Life" in its theatrical release.