Light Curtain Help

[fredz0003]

Hi everyone I am in need of some assistance I don't know where to start I would like to make a light curtain to detect height in boxes, http://www.stiscanners.com/measuring_light_curtains/valuscan_VS6500.html
I just don't know how to do it, all I will need is an analog output based on the height of the box. Any help is greatly appreciated.   

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[fredz0003]

If is not too much to ask, if it can be added to the distribution boxes advanced machine, and have random heights of boxes come out of the conveyor.

[EasyPLC_Master]

Is not difficult, you can create a UserDefinedComponent with two boxes (one for each curtain column).
You can add red lines or a red plane to simulate the light between each curtain column (only for visual porpoise).

You can add a code in the Main Method like this:

// The box with id 0 will be the scanning unit located at the left
int wp = Editor.WorkPartDistRayColId(0, box[0].body.Position, new Vector3(1,0,0), 0.5f);
// This function returns the WorkPart Id number that collides with a Ray from the 0 id box component,
// with box[0] position, the target is right direction and the distance is equal or lower than 0.5.

if(wp > -1)
{
    TmpMoveItem bx = (TmpMoveItem)WorkPartListF[wp];
    // if a workpart is detected the size variable will contain the size of the workpart:
    Vector3 size = bx.Scale;
}