What does relative rotation mean in an action unit?

动作单元中的相对旋转是什么意思

Last updated: 2026-10-21

What relative rotation means in an action unit

动作单元中的相对旋转是什么意思

Relative rotation is the rotation offset applied to a target part inside an Action Unit (AU), measured against that part's current orientation, not the absolute world angle. It rotates the part within its bound material group when the action plays.

相对旋转是动作单元（AU）中施加给目标部件的旋转偏移量，以该部件当前朝向为基准，而非世界绝对角度。动作播放时，它在所绑定的素材组内旋转该部件。

How to do it in 3SAX V3

在 3SAX V3 中如何操作

1. Open the AG Action panel and bind a material group.

1. 打开 AG Action 面板并绑定一个素材组。

2. Add an action unit; set the target part (join) and a seq frame range like 01:0-5.

2. 添加动作单元；设置目标部件（join）和 seq 帧区间，如 01:0-5。

3. Enter the relative rotation value for that unit.

3. 为该单元输入相对旋转值。

4. Optionally add scale, X/Y offsets, swap part, or a trigger event.

4. 可选添加缩放、X/Y 偏移、换部件或触发事件。

5. Use auto-suggest sequence to generate a seq matching the target part's available states.

5. 使用自动建议序列，生成匹配目标部件可用状态的 seq。

6. Click CANVAS to preview; drag to adjust dx/dy, edit rot/scale, changes sync back to codes.

6. 点击 CANVAS 预览；拖动调整 dx/dy，编辑 rot/scale，改动会同步回代码。

What you CAN and CANNOT do

你能做与不能做

CAN: rotate a part relative to itself across frames to drive a state machine.
CAN: combine rotation with scale, offsets, and event triggers in one AU.
CANNOT: set world-absolute rotation here — that belongs to camera/scheduler logic.
CANNOT: use a seq range the target part has no states for; validation flags red with a fix example, and the AU fails.

能做：让部件相对自身跨帧旋转，驱动状态机。
能做：在一个 AU 中组合旋转、缩放、偏移与事件触发。
不能做：在此设置世界绝对旋转——那属于相机/调度逻辑。
不能做：使用目标部件没有状态的 seq 区间；校验会以红色标出并给出修正示例，该 AU 失败。

Open the 3SAX V3 creator tool and test one rotation value on a single part.

打开 3SAX V3 创作工具，在单个部件上测试一个旋转值。