![]() ![]() ![]() However, the story reels for The Good Dinosaur called for large crowds with such complex inter-agent and environment interaction that simulated crowds were necessary. The crowds team on Brave and Monster's University replaced it with a new system for "non-simulated" crowds that sequenced geometry caches via finite state machines and sketch based tools. A re-write of the studio's proprietary animation software, Presto, deprecated this crowd pipeline. Pixar has a history with agent based crowd simulation using a custom Massive based pipeline, first developed on Ratatouille, and subsequently used on Wall-E, Up, and Cars 2. MURE has proven its success on two feature films, The Good Dinosaur, and Finding Dory, with crowd spectacles including flocks of birds, swarms of fireflies, automobile traffic, and schools of fish. Dubbed MURE (Japanese for "crowd"), this system employs a new VEX context with lock-free, multithreaded KD-Tree construction/look-up, a procedural finite state machine for massive animation libraries, a suite of VEX nodes for fuzzy logic, and a fast GPU drawing plugin built upon the open source USD (Universal Scene Description) library. We present a suite of technologies built around Houdini that vastly improves both its scalability and directability for agent based crowd simulation. High end animation systems like Autodesk Maya are tailored for scenes with at most tens of characters, whereas more scaleable VFX packages like SideFX's Houdini can lack the directability required by character animation. ![]() Crowd simulation in visual effects and animation is a field where creativity is often bound by the scalability of its tools. ![]()
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