叶子破坏效果特效解析Foliage Destruction Effects Animation Breakdown – Ahmed Hassan

The Story:
From NBC’s TV show Timeless, the time machine (a.k.a. Lifeboat) has been left in the woods for years that plantation has grown over it. In this shot, it starts revolving its rusty outer rings, clearing the foliage and kicking up dirt in the process.
Effects Animation breakdown:
All the FX were done in Houdini.
1- Building the plant:
1-a) The trunks were procedurally created by drawing lines on top of the time machine. Then branches are added, and together with the trunks are surfaced to take the final look.
1-b) Previously created bushes are instanced over the branches randomly.
2- Simulation and Animation:
2-a) Simulation was done in stages, each stage is layered on top of the previous one. The first stage is the trunks, simulated via Finite Element Solver to allow for Soft Body Dynamics and tearing. The actual simulation was done on a tetrahedralized version of the trunks.
2-b) Twigs are then attached to the branches and through a custom made process, they sway back and forth using a spring effect, conveying the bouncy motion.
2-c) Leaves are later attached to the twigs.
2-d) Some of the twigs detach from the main body, those ones go through a RBD Solver to bounce freely in the environment.
2-e) Some of the leaves detach from the twigs, and enter a Particle simulation.
3- Secondary Effects:
3-a) Dirt is done using Particles and Grain Solver.
3-b) Pyro was used for the dust.
3-c) Dead leaves and twigs falling on the ground were simulated via RBD Solver.
故事：
从美国全国广播公司（NBC）的电视节目“永恒”（Timeless）来看，时间机器（a.k.a.救生艇）已经在树林中留下了多年，种植园已经在它上面生长。在这个镜头中，它开始旋转其生锈的外圈，清除树叶并在此过程中踢出污垢。
效果动画细分：
所有的外汇都是在Houdini完成的。
1-建设工厂：
1-a）通过在时间机器顶部绘制线条来程序地创建树干。然后添加分支，并与树干一起浮出最终外观。
1-b）以前创建的灌木丛随机地在分支上实例化。
2-模拟和动画：
2-a）分阶段进行模拟，每个阶段分层在前一个阶段之上。第一阶段是通过有限元求解器模拟的树干，以允许软体动力学和撕裂。实际模拟是在四面体版本的树干上完成的。
2-b）然后将树枝连接到树枝上并通过定制的工艺，它们使用弹簧效果来回摆动，传达弹性运动。
2-c）叶子后来附着在树枝上。
2-d）一些树枝从主体上脱落，那些通过RBD解算器在环境中自由弹跳。
2-e）一些树叶从树枝上脱落，并进入粒子模拟。
3-次要影响：
3-a）使用粒子和颗粒溶解器完成污垢。
3-b）Pyro用于灰尘。
3-c）通过RBD Solver模拟落在地面上的枯叶和树枝。