What is the difference between rotation, rotationQuaternion, rotate(), addRotation()?

[Tricotou]

Hello

• rotation: BABYLON.Vector3 defining the rotation of a mesh in EULER mode
• rotationQuaternion: BABYLON.Quaternion (see it as a Vector4) defining the rotation of a mesh in QUATERNION mode
• rotate(): Method for rotating around a specific axis
• addRotation(): Method for adding Euler angles to the current rotation

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Now if you wonder why using Quaternion, it’s usefull because it a way to avoid the Gimbal Lock problem of euler angles.

Best way to understand it is to open Blender and :

• Rotate a cube 90° on Y axis
• Now you cannot rotate global X anymore. Both X and Z rotation seems to be influencing the global Z axis and you are basically stuck. Rotating global X is now impossible.

++
Tricotou