3ds max 刚体运动的基础知识

最新推荐文章于 2024-07-15 10:45:00 发布

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最新推荐文章于 2024-07-15 10:45:00 发布

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分类专栏： 3d Studio Max 文章标签： animation properties primitive delete object reference

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本文介绍了3ds Max中刚体和软体运动的基础知识。刚体在运动时保持形状不变，如玩具和地板，而软体如绳子和布在运动中会发生形变。Havok 1 World主要模拟刚体，Havok 3 World则支持更复杂的运动。默认重力加速度与现实世界相符，deactivates功能用于停止模拟。密度作为质量与体积的比值，例如水的密度是1000kg/m^3。此外，刚体集合辅助跟踪场景中的刚体，不影响渲染且位置无直接影响。使用shift+drag可创建复制、实例或引用对话框。

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rigid body: 刚体，在运动过程中形状不发生改变。如玩具，玩具盒，地板。

soft body(deformable body): 软体，与刚体相对，在运动过程中形状发生改变。如绳子，布等。

Havok 1 World & Havok 3 World: 后者只能模拟刚体运动。
默认的重力加速度（z gravity）为-386.22 inches/s^2 (equal to -9.8 m/s^2)；加速度的正负值表示运动方向。
注: 1m = 39.370079 inches
deactivates : stops simulating
density(密度): 质量除以体积；参照：水的密度是1000kg/m^3

Steps for simple movement based on physics properties:
step 1. open the reactor toolbar, customize > show UI > show floating toolbars.
step 2. utility > reactor > properties to modify each objects's physics properties, set the mass value and simulation geometry..
step 3. add all the simulation objects into the Rigid Body Collection:
press Create Rigid Body Collection, add all the objects needed to be in the animation to this collection.
two ways to add: 1. select all the objects, then press this button; 2. create the rigid body collection first, then select the collection wheel, go to modify > , using pick or add.
step4. modify the gravities and collision tolerence in Havok 1 world.
Note:
(1). A rigid body can comprise more than one object, or primitive. A rigid body with more than one primitive is known as a compound rigid body(group). Objects in the group will act as parts of the same object. Notice: the primitives in the group can have different mass. Such as the toy wobble around.

(2). Rigid body collection is a helper object, only used to keep track of the rigid bodies in the scene, not shown up in renderings and its position has no effect.

(3). shift + drag: prompt out copy, instance or reference dialogue

two ways to preview animation:
way1. preview window: reactor > preview animation icon: press p to play or pause, press r to reset the simulation.
way2. physically-based keyframes: reactor > create animation, this will create the keyframes on the track bar. Then click Play to preview the animation in the viewport.

Note: How to delete all the keyframes on the track bar of an object?
Way1:
step1: Go to frame 0, select the object;
step2: alt+right click the object, and choose Delete Selected Animation.
Way2:
utility > reactor > Utils > Delete All Keys.