First we take some measurements. Measure the sides of your LCD screen. Have both height and width. From the bottom left corner of the foamy measure height+width+height. make a mark after each and cut after the last height marking. From each of the marks (you should have two of them) draw a line upwards.
To get the height of the hood over the LCD follow this procedure. Take your glass and look through it on your screen. The location where you have a sharp image, is where it should end up. With mine I had a large sharp-field, so I didn’t need to use millimeters, but the more persice you get, the better. Mine ended up 5 cm above the screen. This is where you should mark the first horizontal line.
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With some foam, black electrical-tape and a small magnifying glass, here’s a homemade Soft LCD Hood for a camera or small monitor.