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physics-intuition

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Physics Intuition

物理直觉

Think like a physicist watching the world move. Every object has mass. Every motion has cause and consequence.
像物理学家观察世界运动那样思考。每个物体都有质量，每个运动都有其前因后果。

Core Mental Model

核心思维模型

Before animating anything, ask: What does this weigh?
A feather and a bowling ball both fall, but they tell completely different stories. Your job is to make the audience feel that weight without thinking about it.
在制作任何动画之前，先问自己：这个物体有多重？
羽毛和保龄球都会下落，但它们呈现的效果截然不同。你的任务是让观众无需思考就能感受到物体的重量。

The 12 Principles Through Physics

从物理视角看动画十二原则

Squash & Stretch — Mass is conserved. When something compresses, it must bulge. A bouncing ball flattens on impact because its volume has to go somewhere.
Timing — Heavy = slow to start, slow to stop. Light = quick reactions. A truck and a bicycle brake very differently.
Slow In & Slow Out — Nothing starts or stops instantly. Acceleration and deceleration are the fingerprints of mass.
Arcs — Gravity curves everything. Even a punch follows a pendulum path from the shoulder. Straight lines feel robotic.
Secondary Action — When the main mass moves, attached masses follow with delay. Hair, clothing, jowls—they're all passengers on the physics train.
Follow Through & Overlapping Action — Different masses have different momentum. A character stops, but their belly keeps going. This is inertia made visible.
Anticipation — Force requires windup. You can't push without first pulling back. Show the gathering of energy before release.
Exaggeration — Push physics past reality to feel more real. A heavy landing needs more squash than actual physics would produce.
Staging — Position elements so physical relationships read clearly. The audience must understand spatial cause and effect.
Straight Ahead & Pose to Pose — Use straight ahead for chaotic physics (explosions, water). Use pose to pose for controlled physics (a character lifting something).
Solid Drawing — Volume must remain consistent. A character can't lose mass between frames without the audience noticing something is wrong.
Appeal — Even physics follows design. Decide if your world has cartoon physics or realistic physics, then be consistent.
Squash & Stretch — 质量守恒。当物体受到挤压时，必然会产生凸起。弹跳的球在撞击地面时会变扁，因为它的体积必须有去处。
Timing — 重物启动慢、停止也慢；轻物反应迅速。卡车和自行车的制动效果截然不同。
Slow In & Slow Out — 没有任何物体会瞬间启动或停止。加速与减速是质量的直观体现。
Arcs — 重力让所有运动轨迹都呈曲线。就连出拳也是从肩膀开始的钟摆式路径。直线运动看起来会很机械。
Secondary Action — 当主体运动时，附着在其上的物体会滞后跟随。头发、衣物、下巴赘肉——它们都是物理规律的“乘客”。
Follow Through & Overlapping Action — 不同质量的物体具有不同的动量。角色停下脚步，但肚子还会继续向前。这就是可见的惯性。
Anticipation — 施力需要蓄力。你无法不先向后拉就向前推。要在释放能量前展示能量的积聚过程。
Exaggeration — 突破现实物理限制，让效果更具真实感。重物落地时的挤压程度要比实际物理规律中的更明显。
Staging — 合理布置元素，让物理关系清晰可辨。观众必须能理解空间上的因果关系。
Straight Ahead & Pose to Pose — 混乱的物理效果（如爆炸、水流）适合用逐帧动画法；可控的物理效果（如角色举起重物）适合用关键帧动画法。
Solid Drawing — 体积必须保持一致。角色不能在帧与帧之间凭空失去质量，否则观众会察觉到违和感。
Appeal — 就连物理规律也要遵循设计风格。先确定你的世界是采用卡通物理还是写实物理，然后保持风格一致。

Practical Application

实际应用

When something feels "floaty" or "weightless":
  1. Add more ease-in at the start of motion
  2. Increase ease-out at stops
  3. Add settling oscillations (things don't stop perfectly still)
  4. Check that secondary elements lag appropriately
When something feels "stiff":
  1. Introduce squash at impact points
  2. Add stretch during fast movement
  3. Ensure arcs in all trajectories
  4. Let different body parts arrive at different times
当动画效果显得“漂浮”或“失重”时：
  1. 在运动开始时增加更多的缓入效果
  2. 在停止时增强缓出效果
  3. 添加余震效果（物体不会完全静止）
  4. 确保次要元素的滞后效果合理
当动画效果显得“僵硬”时：
  1. 在撞击点添加挤压效果
  2. 在快速运动时添加拉伸效果
  3. 确保所有运动轨迹都呈曲线
  4. 让身体不同部位的运动有先后顺序

The Golden Rule

黄金法则

Audiences don't analyze physics—they feel it. Your job isn't accuracy; it's believability. Sometimes breaking physics (hanging in mid-air before a fall) creates more convincing weight than obeying it.
观众不会分析物理规律——他们只会感受。 你的任务不是追求物理准确性，而是营造可信感。有时打破物理规律（比如坠落前在空中短暂停留）反而比严格遵循规律更能体现重量感。