# 旋转#

These parameters specify how the individual particles are rotated at the start of, and during, their lifetime. You can visualize their orientation by setting Display As to Axis in the 视图显示 panel.

The emitter's surface normal, additionally aligning the particle's Y axis to the positive V direction in the emitter's active UV map. This makes it possible to deform the emitter while keeping particle rotation consistent.

The particle's initial velocity vector/hair growth direction.

How much to randomize the particle's initial rotation (along all axes).

Initial rotation around the particle's X axis, going from -1 (-180°) to 1 (180°).

Maximum random rotation to add to the Phase, going from 0 (0°) to 2 (360°).

Whether the particles' rotation can change over time.

## 角速度#

Lets you configure if and how particles should spin over time. Dynamic needs to be enabled for this to work.

The axis to spin around. If this is set to Velocity, Horizontal, or Vertical, particles will additionally spin to keep the same orientation relative to their direction of movement, even if Amount is zero.

Spinning is disabled.

Spin around the particle's velocity vector.

Spin around the axis that's horizontal (lying in the global XY plane) and perpendicular to the particle's velocity. Particles moving along the global Z axis won't spin because no unique rotation axis exists in this case.

Spin around the axis that's perpendicular to both the particle's velocity and the above Horizontal axis. Particles moving along the global Z axis won't spin.

Spin around the chosen global axis.

Spin around a random axis.

Hint

If you use a 曲线引导 and want the particles to always point in the direction of the curve, you should set the Orientation Axis to Velocity / Hair, enable Dynamic, and set the Angular Velocity Axis to Velocity.

(For a regular object, you'd normally use the Follow Curve option of a Follow Path Constraint 跟随路径约束 or the legacy Follow option of the curve itself, but these don't work for particles.)

How fast to spin around the Axis.