Copyright Blue Sky Studios.
I developed the technique, shape and motion of fire FX in "Ice Age: The Meltdown", supervising and supporting the effect across the department, including managing many of the temp hires. As with all fire FX, lighting and materials play a large part in successful implementation. Alen Lai did a lot of great work in that regard. He executed the campfire shots as well, adding the smoke displayed in the final frames.
This clip displays development tests, then working progressions of several shots.