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Might help for doing perspective. A totally adjustable grid I use it a lot.
you must build this on a transparent background. I save mine in a PS tools folder for when I need it. Anything you do using the grid MUST be on a new layer.
For those that use CS2, you can create your perspective grids using the Vanishing Point plugin, just do it on a blank layer. Create the perpective grids, and hit Alt(Opt)/OK and the perspective grid dumps onto its own layer.
Sorry, but I'm not impressed.
Normally, if you want to use mathematical perspective, not only the lines of the grid should meet at the vanishing point on the horizon, but the diagonals of the squares should do the same, namely meet in one point on the horizon line.
A random shortening of the piece of grid is either sheer luck or a hazard.
I guess one should add a layer, define a horizon, vanishing point and diagonal meeting point and then distort the gird untill it fits.
Along the same lines..
If need a grid in perspective to use as a guide..I use a pattern fill.
example:
Make a new transparent page 20px x 20 px
use a hard pencil brush set to 2, color green.
Make a line along the left and bottom of the square. (see attached)
Go under edit / define pattern and name it Green Guide.
Now if you need a guide simply make a new layer go to the paint bucket / fill pattern and select the Green Guide. Now fill empty layer.
Simple use the transform / perspective to get it the way you need it.
I'd certainly like to clarify one thing. I'm not here to impress anyone. But I certainly know how to set a simple 1-2 or 3 point perspective. Vanish points and horizons are a given. I have a 21" moniter. It is fairly impractical to set a vanish point that may be miles away from the subject.
(although it can be done mathematically). The grid is simply somewhat of a 'shortcut' if you don't have CS2 or Freehand. If you're illustrating say, a wall tith a window in it, in perspective, it works just fine.
This illustration shows how to plot a very simple 3-point persp. grid.
Thats a lot to go through to get a simple angle.
That tutorial does not explain this. Perhaps you know about exactly how to calculate the width of the rectangle in your square/grid, but most people visiting this forum don't.
Why do you identify with a tut by someone else that isn't complete?
PS perspective grids 
Linear Mode
