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Claes Lundstrom

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    www.touchcad.com , www.lundstromdesign.com
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  1. My solution to this rather annoying shortcoming is to have a small wireless separate numerical keyboard attached when I'm on the move.
  2. It's for sure more than an aid for rendering. In this example, a two or three minute scan in combination with the Clip Cube gives and excellent status report of how well the floor drainage is working, as you can clearly see the angle of the floor towards the drain well. A better scanner, such as the Matterport would probably give a better result, but it's never an absolutely correct result. It should also be pointed out that a conventional laser distance measuring device also comes with a degree of errors. You can try it by scanning the distance between two seemingly flat walls. Just tested my Leica at a distance of about five meters and found a fluctuation of 4-5 mm in a series of ten measurements at the same location. That equals to an error margin of 0.1 %. The main flaw with laser and ladar measuring is that it does not know what is important and not. Having thousands of measuring points on a more or less flat wall or floor is a bit pointless. We as humans can instantly see where the shape actually changes, and we can therefore instantly reduce the number of measuring points to an absolute minimum. I did a lot of boat cover designs a few years back, where we tried all available methods for scanning. On a boat cover, you are not really interested in the panels as such, just where the edges are located, and this is where point cloud measuring is pretty useless. We also tried a Dutch wire based system (very expensive) and found that the internal precision it required to make it work made it drift and becoming unreliable after a while. The best way was actually to use photogrammetry using user defined measuring points. Photogrammetry uses a series of pictures from different angles and where the program compiles the data into a small number of 3D points that you can skin. A conclusion is perhaps that each of these devices have their strengths and weak points. Laser/Ladar works best on flat of gently curved shapes, but having problems with finding precise corners. In a house with flat walls, you can use the wealth of similar points to identify a wall or floor and then let the CAD program find the joints. The trick is to find the right combination of tools for a given task.
  3. My guess is about 1%. Heights are a little more accurate. You can't measure something like a kitchen for production design where you cut everything to measure, but it has proven invaluable as it gives a lot of details and where they are located. Great for creating cost estimates. In the example, one of the tasks where to locate plumbing and ventilation, where we did not have any documentation at all. The architectural drawings from 1939 where a bit sketchy and the building had some changes made over its 80 year plus lifetime. I'm actually surprised how useful it has been scanning with the phone, and I suspect every contractor will have something like this in their standard tool set some time very soon.
  4. Here is a compilation of about 25 scans direct imported into VW, and used for documenting a building in combination with the technical drawings (not shown here). The scanner used was an iPhone 13 Pro equipped with the freeware Scaniverse. The resulting file is about 600 Megs.
  5. On the subject of argumented reality, I have tried Adobe Aero, and it seems to work with files from VW, TouchCAD, Scaniverse and Keyshot on both the Mac and on iPhone. The picture is from an iPhone.
  6. It's not 16 curves as such. It does indeed work If you make one simple curve and duplicate it using Duplicate Array. So the shape is most likely the key here. I think the underlying 3D engine simply thinks your shape is too complicated to work, for example overlapping itself or something like that.
  7. The biggest limitations when scanning objects with an iPhone, such as the Eames chair, comes on the skinny parts, for example the foot and armrests. Bigger more solid chunky objects typically works fairly ok I would say. In my example, a 250 year old chair, the seat works fine, whereas the skinny and more intricate parts fail. The problem with it is of course the combination of being skinny and having a very intricate and detailed shape. Another disadvantage with scans in general for a symbol is that the model becomes much bigger. A good symbol should always have as few elements a possible, especially when you insert many on a bigger model. Keep it as simple as possible while maintaining a recognizable shape. Scaniverse.mp4
  8. On the phone level, it can not be used directly to measure for example kitchen cabinets. It's simply not accurate enough for precision measurements. It is however useful for quick price estimates and an excellent piece of documentation. Another major flaw with scanners is that they generate huge files where almost everything consists of junk info. As an example, imagine a very simple table model, represented by an extruded rectangle representing the table top and four small extruded rectangles for the legs. The parts can be defined mathematically by a very limited number of coordinate data. Most scanner software on the other hand, needs to measure a huge number of points just to be able to estimate where the key data points (the edges) are located. The fundamental difference is that the human computer can instantly figure out where the edges and boundary are, whereas most scanner software can't. On more organic shapes things swing a bit towards scanning. Manual modeling can still generate much smaller models, but it requires way more skill and craftsmanship to get there. The example is probably beyond what most CAD designers could achieve and it would take quite a lot of work. The scan took less than five minutes with an iPhone 13 Pr. The result is surprisingly similar to the original (the picture to the left was placed next to the original within the scanning software). The model was also accepted without any problem by the 3D printer software and came out fairly good on a simple $200 3D printer.
  9. I have used my iPhone too and found it quite useful. In this example, I tried to illustrate potential drainage problem against a house wall. Here is another example where I made sure it was safe to drill a vertical hole in the middle of a lot of piping and equipment, by placing two different scans from two different floors on top of one another. Note how well the walls aligned.
  10. I think meshes are what the are, and are not really affected by these settings. NURBS based models are different as they enable you to calculate pretty much any mesh resolution / smoothness within a given surface, though in VW it means high, low, and medium rather than using numerical settings, and as a universal setting rather than an object specific setting. The picture shows an example from another CAD program, where such settings exist, and where one side consists of 28800 quads and the other side of 81 quads, and I can individually change it back and forth at any time and when I need to. I personally find such settings invaluable. Technically, there is no reason why VW could not have it too, but there isn't.
  11. Generate a separate rendered water surface that looks like thet type of water you want, and use an extraction of that as a texture map in the shaded version. It will of course not look as good as a full rendering, but the Shaded mode was not intended for that type of use.
  12. Scaniverse is also my absolute favourite after have tested several similar programs. Scaniverse works very well with VW in several file formats. Using a points style format works best for terrain models. I mostly use OBJ for textured models though.
  13. Accuracy is, according to their web site, +- 0.5% on a 12 ft long line, so +- 18.3 mm. So, in my experience it does not seem better than the lidar apps I have used for the iPhone 12/13 Pro. Seems rather expensive relative to what it does.
  14. I agree that it would be very useful to be able to control the number of points (beyond high, medium and low), and exact behaviour of a given curve. In my main 3D modelling program, I can set it locally for each given element, part of an element, and numerically to whatever I find relevant for any given task. I find it extremely useful, and could probably not live without it for my type of work.
  15. Have done a lot of such work. The problem is often in the other end, that is, many of the programs used for controlling CNC machines have severe limitations. The software is often simplistic and often ageing. I therefore suggest keeping geometries on a very basic level. In 2D, it typically means using lines, polygons, and arcs to define things. Avoid Berzier and spline curves. Avoid symbols and groups. Avoid using filled surfaces, and for example using Clip Surface to define a hole in a closed polygon/polyline shape. On polylines, only define shapes using straight lines and arcs.
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