   Mouse In the World Managed
  HiI have been working on this problem for a few days now with no success.  My problem is that i am trying to create a simple map editor for my program.  But im having a problem locating were my mouse is in the device.  I have my device setup in a picturebox.  I mean it wouldnt be a problem if i didnt want to zoom in on the map, but since i want to be able to zoom in i need to be able to find the ratio from my map on the screen to my actual map in pixels.And the map is just how it sounds there is no 3d work on the world itself its all done on a 2d plane.I dont know if this made sense but it would be nice if someone could comment on how i could do something like this thanks.   
  ok i found out how to find the position of my mouse.  using this page... http://www.mdxinfo.com/tutorials/picking.phphowever... i am not using the framework.so whenever i change my view matrix this code does not work and i do not understand why... does anyone have a thought about this?   