During the Entish assault on Isengard, one particular of them catches hearth. As the Ents split the dam overlooking Isengard, there is an Ent in the foreground holding a struggling orc in his hand. There is a shot of the Ring lying in the snow in the foreground.
The scientists had used publicly accessible photos of Hanks to build a 3-dimensional design, or "mesh," of his face on to which they projected his characteristic expressions.