If uv rotary , how to calculate?
If the object also rotate , how to calculate?

That is to say, need to compute the uv and the rotation of the object,

 using System. Collections. Generic; 
Using UnityEngine; 
Using UnityEngine. EventSystems; 

Public class NewBehaviourScript: MonoBehaviour IBeginDragHandler, IDragHandler 
{
Private static int moveId; 

[SerializeField] 
Private float rotateSpeed=5; 

Private Material Material; 
Private Vector3 oldWorld; 
Private Vector2 size; 
Private Vector2 scale; 
Private Vector3 newWorld; 
Private Vector3 offset=Vector3. Zero; 
Private Vector2 center=new Vector2 (0.5 f to 0.5 f); 
Private MeshRenderer MeshRenderer; 
Private Mesh Mesh; 

Private void Awake () 
{
Mesh=GetComponent (). The mesh; 
MeshRenderer=GetComponent (a); 
Material=meshRenderer. Material; 
Var boundsSize=meshRenderer. Bounds. Size; 
Size=new Vector2 (boundsSize. X, boundsSize. Z);//0 
//size=new Vector2 (boundsSize. X, boundsSize. Y);//x rotation - 90 
//size=new Vector2 (boundsSize. Y, boundsSize. Z);//z rotation - 90 
//size=new Vector2 (boundsSize. Y, boundsSize. Z);//z 90 
//size=new Vector2 (boundsSize. X, boundsSize. Z);//x rotation - 180 
RotateUV (rotateSpeed); 
} 

Void IBeginDragHandler. OnBeginDrag (PointerEventData eventData) 
{
OldWorld=eventData. PointerCurrentRaycast. WorldPosition; 
Scale=material. GetTextureScale (" _MainTex "); 
MoveId=GetInstanceID (); 
} 
Void IDragHandler. OnDrag (PointerEventData eventData) 
{
If (moveId!=GetInstanceID return ()); 
If (eventData pointerEnter==null) return; 
NewWorld=eventData. PointerCurrentRaycast. WorldPosition; 
Offset +=newWorld - oldWorld; 

Material. SetTextureOffset (" _MainTex ", new Vector2 (offset.. * scale in x x/size x, offset.. z * scale in y./size, y)); 
//material. SetTextureOffset (" _MainTex ", new Vector2 (offset) x * scale) x/size x, offset.. * y scale. The y/size. The y)); 
//material. SetTextureOffset (" _MainTex ", new Vector2 (- offset. Y * scale. X/size x, offset.. z * scale in y./size, y)); 
//material. SetTextureOffset (" _MainTex ", new Vector2 (offset. Y * scale. X/size x, offset.. z * scale in y./size, y)); 
//material. SetTextureOffset (" _MainTex ", new Vector2 (offset) x * scale) x/size x, - offset.. z * scale in y./size, y)); 

OldWorld=newWorld; 
} 

///& lt; Summary> 
///rotating uv 
///& lt;/summary> 
///& lt; Param name="Angle" & gt;  
Public void RotateUV (float Angle) 
{
Angle Angle of=* Mathf. Deg2Rad; 
List
for (int i=0; i {
Vector2 uv=uvs [I] - center; 
Uv=new Vector2 (uv) x * Mathf) Cos (Angle) - uv. Y * Mathf Sin (Angle), 
Uv. X * Mathf. Sin (Angle) + uv. Y * Mathf Cos (Angle)); 
Uv +=center; 
Uvs [I]=uv; 
} 
Mesh. SetUVs (0, uvs); 
} 
}