if (isSkinned)
                        {
                            // if ((effect.Parameters["Bones"] != null) && isSkinned)
                            if ((effect.Parameters["BoneRotations"] != null) && isSkinned)
                            {
                                // effect.Parameters["Bones"].SetValue(bones);

                                // �s��̕���
                                Quaternion[] rotation = new Quaternion[bones.Length];
                                Vector3[] translation = new Vector3[bones.Length];
                                Vector3 scale;
                                for (int i = 0; i < bones.Length; i++)
                                {
                                    bones[i].Decompose(out scale, out rotation[i], out translation[i]);
                                }
                                effect.Parameters["BoneRotations"].SetValue(rotation);
                                effect.Parameters["BoneTranslations"].SetValue(translation);
                            }
                        }