A-Frame中文教程

rotation

The rotation component defines the orientation of an entity. It takes the roll ( x), pitch ( y), and yaw ( z) as three space-delimited numbers indicating degrees of rotation.

All entities inherently have the rotation component.

Example

            
< a-entity rotation= "45 90 180"> </ a-entity>

Value

A-Frame uses a right-handed coordinate system. When aligning our right hand’s thumb with a positive axis, our hand will curl in the positive direction of rotation.

Axis Description Default Value
x Roll, rotation about the X-axis. 0
y Pitch, rotation about the Y-axis. 0
z Yaw, rotation about the Z-axis. 0

Relative Rotation

Child entities inherit from world-space rotations from parent entities. Consider this scene:

            
< a-entity id= "parent" rotation= "0 45 0">
< a-entity id= "child-1"> </ a-entity>
< a-entity id= "child-2" rotation= "15 45 30"> </ a-entity>
</ a-entity>

The world-space rotation of #child1would be 0 45 0as inherited by the entity. In the local parent’s space, #child1‘s rotation would be 0 0 0.

The world-space rotation of #child2would be 15 90 30, by combining the rotation with the parent entity. In the parent’s local space, #child2‘s rotation would be 15 45 30.