Simon, The "wiki" (gauge3.info) was lost when the server was replaced .... the data centre deleted files from the old server without keeping a back-up. I also had problems with this forum which took over a week to repair but was able to save it. Although the the "wiki" articles and link pages were lost, I do still have copies of all the downloads...including the article you require. I will email it to you. Regards, John.
Sorry if you felt I was lecturing you : My intention was to draw attention to the professional applications of photogrammetry (not merely for "hobbyists").
I agree it is a case of "horses for courses" and it is a "broad brush" method.
Although my test subjects have been small (using just a webcam and empty PLA spool as turntable!), simply to try out the software, the intention is to use it on large objects (e.g. buildings,statues. war memorials) and in conjunction with a professional drone pilot and commercial film/TV broadcast quality photographic equipment.
Thank you both for your replies, which were much as expected but it is good to have them confirmed. I have no plans to build any diesel locos so I'll stick with CAD for now. Unless I get a sudden urge to build an A4 ...
While photogrammetry lets you cover a large amount of ground quickly, it does so with a low degree of accuracy. 3D laser scanning on the other hand typically has a smaller footprint of data being collected, but it's collected to a higher level of accuracy.
I think you need to examine the capabilities of both techniques more carefully before you start lecturing me with sales blurb.