You can also access the active camera image using the AVFoundation routines in Jason King’s iOSKit extensions. It is possible and does work, but generally not recommended, to overlay a MobileCanvas directly on top of the camera view control. The hardest part for the OP’s application would be scaling the scale bar correctly. One can zoom the camera with the usual pinch gestures but I don’t know how you can extract the focal length before taking the picture (it should be recorded in the EXIF data once the picture is taken) and that alone still would not give you all the info you would need to get the scale right. I don’t know of anyone who has accessed the iPhone LiDAR data with Xojo but it probably can be done with the right declares (and would be very useful for a variety of applications).
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