Initializes a #graphene_euler_t using the given normalized quaternion.
If the #graphene_quaternion_t q is null, the #graphene_euler_t will be initialized with all angles set to 0.
a normalized #graphene_quaternion_t
the order used to apply the rotations
the initialized #graphene_euler_t
Initializes a #graphene_euler_t using the given normalized quaternion.
If the #graphene_quaternion_t q is null, the #graphene_euler_t will be initialized with all angles set to 0.