Quaternions are used to represent rotations.
コンパクトであり、ジンバル ロックの問題がなく、簡単に補間できます。 Unity は全ての回転を表現するのにクォータニオンを内部的に使用します。 しかし複雑な数字にもとづいており、直感的でない側面があります。 このため個別のクォータニオン成分 (x,y,z,w) をアクセスまたは修正することは殆どありません。 主に既存の回転（例． Transform など）にもとづき 新規の回転を作成します（例．二つの回転の間をスムーズに補間させる） 使用する Quaternion 関数の 99% は以下です: Quaternion.LookRotation, Quaternion.Angle, Quaternion.Euler, Quaternion.Slerp, Quaternion.FromToRotation, Quaternion.identity （他の関数は極めて稀な用途） Quaternion.operator * を使用してひとつの回転を別のものにより回転させる、またはベクトルを回転により回転させることが出来ます。
| identity | The identity rotation (Read Only). This quaternion corresponds to "no rotation": the object. |
| eulerAngles | Returns the euler angle representation of the rotation. |
| this[int] | イデックスによってx,y,z,wにアクセスする。 |
| w | W component of the Quaternion. Don't modify this directly unless you know quaternions inside out. |
| x | X component of the Quaternion. Don't modify this directly unless you know quaternions inside out. |
| y | Y component of the Quaternion. Don't modify this directly unless you know quaternions inside out. |
| z | Z component of the Quaternion. Don't modify this directly unless you know quaternions inside out. |
| Quaternion | Constructs new Quaternion with given x,y,z,w components. |
| Set | Set x, y, z and w components of an existing Quaternion. |
| SetFromToRotation | Creates a rotation which rotates from fromDirection to toDirection. |
| SetLookRotation | Creates a rotation with the specified forward and upwards directions. |
| ToAngleAxis | Converts a rotation to angle-axis representation. |
| ToString | Returns a nicely formatted string of the Quaternion. |
| Angle | Returns the angle in degrees between two rotations a and b. |
| AngleAxis | Creates a rotation which rotates angle degrees around axis. |
| Dot | The dot product between two rotations. |
| Euler | Returns a rotation that rotates z degrees around the z axis, x degrees around the x axis, and y degrees around the y axis (in that order). |
| FromToRotation | Creates a rotation which rotates from fromDirection to toDirection. |
| Inverse | Returns the Inverse of rotation. |
| Lerp | Interpolates between from and to by t and normalizes the result afterwards. |
| LookRotation | Creates a rotation with the specified forward and upwards directions. |
| RotateTowards | Rotates a rotation from towards to. |
| Slerp | Spherically interpolates between from and to by t. |
| operator != | 二つのクォータニオンが互いに一致するか？ |
| operator * | lhs および lhs の回転を組合わせます。 |
| operator == | 二つのクォータニオンは互いに異なるか？ |