In Photomatch, the importantance is emphasised, of setting View Size to same pixel numbers as the photo that's being matched to - 2456x1927 in present case. View Size won't accept such large numbers - 1036 is the largest acceptable height figure. I calculate smaller numbers of same aspect ratio,1.274:1, so the screen View border just fills available height within the MS window - 962x820. However, putting a ruler on the screen View, the resulting picture area has an aspect ratio of only 1.173:1 - too narrow for the height. On clicking Photomatch, I am prompted to add the photo - it Attaches at correct aspect ratio, filling the screen View widthwise but leaving white space at top and bottom. I Photomatch the model to that, Detach the photo (because it isn't enduringly saved as part of a Saved View), add back the same photo via Design File>Views>Background, Save View (includes the Background). But the 'via Design View' photo image isn't same aspect ratio as the 'via Photomatch' photo image. It completely fills the over-tall screen View, so is stretched vertically, unlike the 'via Photomatch' image. So the model doesn't fit on it like it did on the 'via Photomatch' image, so it's not ready to render with photo background. Q1) Why does the screen View's aspect ratio (as measure by ruler) differ from the aspect ratio that's set in View Size?? Q2) Does my monitor have differing pixel scale horizontal to vertical, which needs adjusting (2560x1440 native running at 1920x1080 so should be OK)? Or is it some MS setting, or my graphics card, that is out? Starting to place match points, I'd like to zoom pan and rotate the model but the background image starts gyrating too, in different directions. The first point is snapped to the model OK but the second point is at random position in the screen View, depending where the image was displaying at that time. Q3) Can I lock the background so it doesn't move while I zoom pan and rotate the model? Help says "When using the standard view controls, you must turn off the Move Camera toggle to maintain the photomatch setup and the camera position." These are unchecked - doesn't answer Q3). Q4) If the background does move, how can I pop it back into place? I can recall it as a Saved View but that cancels the Photomatch process, unlike in e.g.SketchUp MatchPhoto. One Photomatch video seemed to solve this by snapping the first points, to the model, in a View 2, which left View 1 undisturbed by zoom pan rotate. Doing the matchpoints works fine - but the Matched result is garbage. At present, seems Photomatch only works if iot's all done in one View and zoom pan rotate isn't touched through the whole process. This makes accuracy difficult - the magifier is near useless. On completion you can zoom/pan to check but not during the Photomatching.
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