Meter Square Grid

One of our recent clients has requested a meter squared grid to be project on the x axis so viewers can gain a sense of scale (up to 15 meters away from the camera position).

I have a few ways in mind in how I can produce this but it seems to be a little bit more complicated that first thoughts. Has anyone produced anything like this before?

With a fixed camera hight, my initial plan was to create a grid made of rope on a flat area, stitch it together and within Krpano project a vector grid overlay on the X axis at the size the matches the size of my rope grid. At this point I will know that my vector grid is calibrated.

Ideally I think it would be best for Krpano to distort the grid for the necessary projection, rather than simulating this first hand in Photoshop (which I think will be less accurate).

Another question is: does anyone know how I can insert an overlay, fix its position and let krpano take care of the distortion?

I think what you have described is a circular grid scale that will give viewers a sense of distance away from the camera.

In fact I'm looking for 15 lines (15 meters long) each seperated by 1 meter connecting North and South, then the same again from East to west. This will make a 1Meter square grid.

If the room is square and has pipes running along the floor, a viewer will be able to estimate the length of the pipe by following the closest parallel line.

I hope this makes sense.

Here is a an example of how it needs to be projected. This was made is PS, by placing a normal square grid on the Nadir. Its not accurate by a long shot but represents the concept.

http://www.clients.tourvista.co.uk/temp/index.html

Ideally, I don't want to create the grid in Photoshop but have it projected as an overlay within Krpano.