The next step is to define the reference lines. The app has two modes for this.

Line-Mode

Within the line-mode, you can create a line with a red starting point and an arrow at the end with one click. By moving the starting point, you can move the whole line in the image. By moving the end point, you can move the orientation of the line such as the length. The directions are only valid when they show towards a vanishing point. The directions will point parallel towards the reference area if no vanishing points exist.


Line mode

Point-mode

In the point-mode, you can create a starting point by clicking onto the image and move that point afterward. Once the point is positioned as you like, press confirm to save it. Next, you can draw and move the finishing point. The same restrictions regarding the directions apply as within the line-mode. Within this mode, you can't move the starting point once you press confirm.


Point mode

Length input

Once you confirm a line, a window pops up that asks you to enter a length. Please note that you need to enter the measurements in meters. Only numbers are valid as input.

Following a selection appears to define the second reference for measurement. You can either choose between an approximate approach where the second reference line is calculated or drawing the second reference line. When you draw the lines, the results are more accurate.