void set_lens_separation(float);
void set_eye_separation(float);
void set_distortion(float = 1.0f, float = 0.0f, float = 0.0f, float = 0.0f);
void set_lens_separation(float);
void set_eye_separation(float);
void set_distortion(float = 1.0f, float = 0.0f, float = 0.0f, float = 0.0f);