ok here is my situation. I created a 3D model of a fireplace mask with alot of detail. It looks great with a black background and the model colored grey. I went into options and changed the background color to black in both the "layout view" tab and also the "plot preview" tab. when I click on preview everything looks fine. but once it is created as a .pdf it has returned back to the default white background with the model being black. This looks horrible because it loses much of the detail. I guess the pdf colors could be manipulated in photoshop but that would be to time consuming in a big complex drawing. I need one of you super CAD gurus to bail me out please!!