Abstract: We introduce a set of techniques that are used together to produce realistic-looking animations of burning objects. These include a new method for simulating spreading on polygonal meshes. A key component of our approach consists in using individual flames as primitives to animate and render the fire. This simplification enables rapid computation and gives more intuitive control over the simulation without compromising realism. It also scales well, making it possible to animate phenomena ranging from simple candle-like flames to complex, widespread fires.