Screen to World Point is working, thanks. But each time I click to move the object it comes closer and closer to the camera and then it eventually it disappears. Also the object only moves if I click on the side of it, and I would like to smoothly drag it to another location. Any suggestions how to solve these problems would be appreciated. Ultimately I want to be able to create an multiple objects in world space with a click of the mouse, and then select them and move them about.