Drag and Drop one Model 3D in XNA

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In XNA 4.0 3D. I want to Drag and Drop one model 3D.So,I must check mouse in a Model or not. My problem is I don't know change position and rate this Model from 3D to 2D. It's related Matrix View and Matrix Projection of camera??
This is my code:
my code

Posted 8-Nov-12 22:35pm

haitrieu749

Updated 8-Nov-12 22:37pm

v2

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ely_bob 9-Nov-12 8:33am

Are you having problems identifying the model or getting it to move at the right speed?

haitrieu749 9-Nov-12 11:28am

Oh, my problem is getting it to move. And I have found the answer for it. This is solution: http://msdn.microsoft.com/en-us/library/bb203905.aspx

haitrieu749 9-Nov-12 11:29am

I want to check mouse in one Model or not.

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haitrieu749 · Accepted Answer · 2012-11-09T05:30:00

Solution 1

http://msdn.microsoft.com/en-us/library/bb203905.aspx[^]

There is a MSFT Sample[^] to do this.

Posted 9-Nov-12 5:30am

haitrieu749

Updated 10-Nov-12 3:32am

v2

haitrieu749 · Accepted Answer · 2012-11-09T19:02:00

In this code example:
Get a Ray in 3D:

C#

Ray GetPickRay()
        {
            MouseState mouseState = Mouse.GetState();

            int mouseX = mouseState.X;
            int mouseY = mouseState.Y;

            Vector3 nearsource = new Vector3((float)mouseX, (float)mouseY, 0f);
            Vector3 farsource = new Vector3((float)mouseX, (float)mouseY, 1f);

            Matrix world = Matrix.CreateTranslation(0, 0, 0);

            Vector3 nearPoint = GraphicsDevice.Viewport.Unproject(nearsource,
                camera.Projection, camera.View, world);

            Vector3 farPoint = GraphicsDevice.Viewport.Unproject(farsource,
                camera.Projection, camera.View, world);

            // Create a ray from the near clip plane to the far clip plane.
            Vector3 direction = farPoint - nearPoint;
            direction.Normalize();
            Ray pickRay = new Ray(nearPoint, direction);

            return pickRay;
        }

And use that Ray to check collision:

public void CheckMouse()
       {
           MouseState mouseState = Mouse.GetState();
           float deltaX = (float)mouseState.X - (float)lastMouseState2.X;
           float deltaY = -(float)mouseState.Y + (float)lastMouseState2.Y;
           if (mouseState.LeftButton==ButtonState.Pressed)
           {
               Ray ray = GetPickRay();
               float selectedDistance = float.MaxValue;

                   Nullable<float> result = ray.Intersects(models[0].BoudingSphere);
                   if (result.HasValue==true)
                   {
                       if (result.Value < selectedDistance)
                       {

                          models[0].Positon += new Vector3(deltaX, deltaY, 0);
                       }
                   }

           }
           lastMouseState2 = mouseState;

       }</pre>

And you can drag and drop one model by mouse.