简介

Force fields offer a way to influence a simulation, in example to add extra movement. Particles, Soft Bodies, Rigid Bodies, and Cloth objects can all be affected by forces fields. Force fields automatically affect everything. To remove a simulation or particle system from their influence, simply turn down the influence of that type of force field in its Field Weights panel.

  • All types of objects and particles can generate fields, but only curve object can bear a 曲线引导 field.

  • Force fields can also be generated from particles. See Particle Physics.

  • 对象需要共享至少一个公共层才能生效。

您可以将粒子的影响限制在一组对象上(请参阅 粒子系统 页面).

创建力场

参考

模式

物体模式

菜单

Add ‣ Force Field

面板

Physics ‣ Force Field

To create a single force field, you can select Add ‣ Force Field and select the desired force field. This method creates an empty with the force field attached.

Examples of an empty with the force field attached.
../../../_images/physics_forces_force-fields_types_vortex_visualzation.png

涡流力场。

../../../_images/physics_forces_force-fields_types_wind_visualzation.png

风力场.

../../../_images/physics_forces_force-fields_types_force_visualzation.png

常力力场。

要从现有对象创建一个字段，您必须选择该对象并切换到 物理 选项卡。在 力场 菜单中选择场类型。

Note

更改场 场 面板或偏转 碰撞 面板设置后，您必须通过 释放缓存 重新计算软体或布料系统的粒子，这不是自动完成的。

Particles react to all kinds of force fields, soft bodies only to Force, Wind, Vortex (they react on Harmonic fields but not in a useful way).

常用力场的设置

Most fields have the same settings, even though they act very differently. Settings unique to a field type are described below. Curve Guide and Texture fields have very different options.

形状

Sets the direction which is used to calculate the effector force. For force fields from an empty object only Point, Line and Plane shapes are available, as for a field from a 3D object there are additional Surface and Every Point options, and Curve for a field from a curve.

  • 点光

    指向全方位影响。使用物体原心作为作用点。

    线形

    The force only acts in the local XY plane, using the Z axis line as the effector.

    平面

    The force only acts in the local Z direction, using the XY axis plane as the effector.

    曲面

    力场作用于3D物体的表面。 在这种情况下，Z轴是表面法线。

    每个点

    使用网格对象中的每个顶点作为效应点。

    曲线

    力场沿曲线对象作用。

强度

实力的场效应。这可以是正的或负的，以改变力的作用方向。力场的强度用力对象的尺度缩放，允许您放大和缩小场景，保持相同的效果。

流

If nonzero, this adds a drag force proportional and opposite to the point velocity.

This effectively re-interprets the force field so that the Strength to Flow ratio at a certain point defines the velocity of an “air flow” field, and objects are encouraged to follow the flow by the resistance caused by the Flow drag force.

噪音量

增加噪音强度的力量。

随机种

改变随机噪声的种。

影响

  • 位置

    Influence the location of particles and other physics entities.

    旋转

    Influence the rotation of particles with Dynamic Rotation. The option is not relevant for other types of physics systems.

Disabling both options completely deactivates the force field.

碰撞吸收

力被碰撞物体吸收。

风力系数

Specifies how much the force is reduced when acting parallel to a surface, e.g. cloth. If set to 1, only the normal component of the force is taken into account.

衰减

在这里，您可以指定力场的形状(如果脱落功率大于0)。

形状

  • 球形

    衰减在全方位统一，就像一个球体一样。

    管形

    脱落导致管状力场。场的径向衰减可以调整，以及场的 最小 和 最大 距离。

    锥形

    掉落会导致锥形的力场。附加选项与 管形 选项相同。

Z向

下降可以设置为仅在正Z轴，负Z轴或两者的方向上应用。

能量(乘方)

How the power of the force field changes with the distance from the force field. If r is the distance from the origin of the object, the force changes with 1/(r - min + 1)power. A falloff of 2 changes the force field with 1/(r - min + 1)2, which is similar to the falloff of gravitational pull.

最小距离

The distance from the object’s origin, up to where the force field is effective with full strength. If you have a falloff of 0, this parameter will have no effect, because the field is effective with full strength up to Max Distance (or infinite). Shown by an additional circle around the object.

最大距离

Specifies the maximum radius in which the force field affects other objects (shown by an additional circle around the object).