Originally Posted by
gpope
Have you ever needed to know what the viewport boundary is in model space, so you know if you were going outside what the viewport would show?
Here is a simple trick to use if you have express tools installed on your system.
In paperspace, draw a rectangle over your viewport.
In the express pull down menu, go to Layout Tools=>Change Space.
OR
Type CHSPACE at the command line.
Select the rectangle you have drawn.
Follow the rest of the prompts
Now you will have a boundary in model space that matches the boundary of your viewport.