Force over Lifetime module
通过此模块中指定的力（例如风或吸力）可对粒子加速。
Using the Force over Lifetime module
This module is part of the Particle System component. When you create a new Particle System GameObject, or add a Particle System component to an existing GameObject, Unity adds the Force over Lifetime module to the Particle System. By default, Unity disables this module. To create a new Particle System and enable this module:
- Click GameObject > Effects > Particle System.
- In the Inspector, find the Particle System component.
- In the Particle System component, find the Force over Lifetime module fold-out.
- To the left of the fold-out header, enable the checkbox.
API
Since this module is part of the Particle System component, you access it through the ParticleSystem class. For information on how to access it and change values at runtime, see the Force over Lifetime module API documentation.
属性
For some properties in this section, you can use different modes to set their value. For information on the modes you can use, see Varying properties over time.
| 属性 | 功能 |
|---|---|
| X, Y, Z | 在 X、Y 和 Z 轴上施加到每个粒子的力。 |
| Space | 选择是在局部空间还是在世界空间中施力。 |
| Randomize | 使用 Two Constants 或 Two Curves 模式时，此属性会导致在每个帧上在定义的范围内选择新的作用力方向。因此会产生更动荡、更不稳定的运动。 |
详细信息
流体在移动时经常受到力的影响。例如，烟雾从火中升起时因周围热空气的拉升作用而略微加速。使用曲线在粒子生命周期内进行力的控制，可实现微妙的效果。根据前面的例子，烟雾最初会向上加速，但随着上升的空气逐渐冷却，力会减弱。从火焰冒出的浓烟可能最初会加速，然后随着烟雾的蔓延而减速，如果持续很长时间，甚至可能开始落到地上。