Using glview

Go to expert compile mode, and make a new configuration (called it glview).

Then click new, and enter in this:

Command: $bsp_exe

Parameters: -glview $path\$file.$ext

Check the box "Use Long Filenames"

Check "Ensure post-file exists" and in the box type in: $path\$file.gl

Check "Use Process Window"

That one is done.

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Now click new, and click "Cmds" and find glview.exe

It's located at \YourSteamUserDirectory\sourcesdk\bin\glview.exe

Parameters: -portals $path\$file.gl

Check the box for "Long File Names"

Check the box for "Use Process Window"