You can set the grid scale when you are setting up or editing your photo match. First get the perspective lines up, and then you can move the mouse to the blue axis. The cursor should turn into an up/down arrow, clicking and dragging will change the scale. You need to know the true dimension of something in your photo. Full building height or width is best, but if you have to you can use a smaller object such as a door or window. If your object is too small then any minor flaw in your scaling will make things worse. That is why a large object is best.
You can also re-scale the model outside of MatchPhoto by using the measure tool on an object and then typing what you want it to be. You should get a warning "do you want to re-scale your entire model".
Actually, I just found another problem. When the SketchUP scenes are imported into Kerkythea, every camera is identical. I assume this is a problem with importing axonometric views -- does anyone know if there is a work-around for this?
