Скрипт для рисования на текстуре не проводит линии

     void Update() 
    { 
         
        if (Input.touchCount == 1) 
        { 
            _touch = Input.GetTouch(0); 
            Ray ray = _camera.ScreenPointToRay(_touch.position); 
            RaycastHit hit; 
 
            if (_Collider.Raycast(ray, out hit, 10000)) 
            { 
                int rayX = (int)(hit.textureCoord.x * _resolutionX); 
                int rayY = (int)(hit.textureCoord.y * _resolutionY); 
                if (_oldX != rayX | _oldY != rayY) 
                { 
                    if (DrawType == "Quad") 
                    { 
                        DrawQuad(rayX, rayY); 
                    } 
                    else if (DrawType == "Circle") 
                    { 
                        DrawCircle(rayX, rayY); 
                    } 
                    else if (DrawType == "Eraser") 
                    { 
                        Erase(rayX, rayY); 
                    } 
                } 
            } 
        } 

     void DrawCircle(int rayX, int rayY) 
    { 
        float r2 = Mathf.Pow(BrushSize / 2 - 0.5f, 2); 
        for (int x = 0; x < BrushSize; x++) 
        { 
            float x2 = Mathf.Pow(x - BrushSize / 2, 2); 
            for (int y = 0; y < BrushSize; y++) 
            { 
                float y2 = Mathf.Pow(y - BrushSize / 2, 2); 
                if (x2 + y2 < r2) 
                { 
                    if (rayX + x - BrushSize / 2 >= 0 && rayX + x - BrushSize / 2 < _resolutionX && rayY + y - BrushSize / 2 >= 0 && rayY + y - BrushSize / 2 < _resolutionY) 
                    { 
                        if (_Coords.Contains(new Vector2(rayX + x - BrushSize / 2, rayY + y - BrushSize / 2)) == false) 
                        { 
                            Color OldColor = _texture.GetPixel(rayX + x - BrushSize / 2, rayY + y - BrushSize / 2); 
                            Color newColor = Color.Lerp(OldColor, color, color.a); 
                            _texture.SetPixel(rayX + x - BrushSize / 2, rayY + y - BrushSize / 2, newColor); 
                            _Coords.Add(new Vector2(rayX + x - BrushSize / 2, rayY + y - BrushSize / 2)); 
                            _Colors.Add(OldColor); 
                        } 
                    } 
 
                } 
 
            } 
        }