Initializes a #graphene_euler_t using the given rotation matrix.
If the #graphene_matrix_t m is null, the #graphene_euler_t will be initialized with all angles set to 0.
a rotation matrix
the order used to apply the rotations
the initialized #graphene_euler_t
Initializes a #graphene_euler_t using the given rotation matrix.
If the #graphene_matrix_t m is null, the #graphene_euler_t will be initialized with all angles set to 0.