Unity模型拖拽移动

unity 鼠标滑动屏幕根据滑动偏移量拖拽模型

按下记录鼠标初始化位置

private Vector3 lastpos;
private float speed=10;
 private void OnMouseDown()
    {
   
        if (PlateformData.GetCurrentPlatform() == PlatformType.PC)
        {
   
            if (!enableMove