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Claes Lundstrom

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Everything posted by Claes Lundstrom

  1. I don't know how much time I have spent rebuilding or adopting models to a practical level. You can usually import models i various formats, but the quality varies a lot. One reason may be that the suppliers use production models rather than models specially optimized for use as symbols. On for example a chair, the production model contains lots of details that you don't actually see in real life, or as a symbol, and can those parts can therefore be removed in the symbol version. The production models are simply way to detailed to be practical. You just want them to look good and be easily identifiable as a given product. In my experience, it is often possible to remove up to 90% of the model data and still have a model that looks pretty much identical to the original. It would be useful if the suppliers made an effort to make models for specific use as symbols. It would also be useful to make more use of textures for details, like it's done in the computer game industry. Most of the details is then processed by the video card instead of the main processor, which creates smaller models, still looks OK both with Renderworks and OpenGL, and renders quickly. In this example, the model to the right only consists of 14 NURBS surfaces plus proper UV mapping of textures. The models where renders in OpenGL.
  2. Claes Lundstrom

    Flattening 3D Geometry - Redux

    Chris, of course it doesn't work from any view than the top view. What you effectively do is to extract a new version of the model as seen from the top view, rather than actually flattening the model. It's like using a camera to extract a view from the top view. You can't do that from the side unless you have some special software that manipulates the data. What you where used to from your previous program was to manipulate the model in a similar way that you manipulate a selection box in VW in the Object Info palette. Unfortunately, VW does not support a 3D selection box with the ability to manipulate the model in 3D, so the suggested method was simply a way to bypass this limitation. Admittedly it would be handy to do it directly as you first suggested, I do it all the time in my other CAD program, but you can't in VW.
  3. Claes Lundstrom

    UVW Unwrap

    Rhino's unfolding is for sure better, but I would not say that it's all that reliable or top notch.
  4. Claes Lundstrom

    3d powerpack unfold surface tool

    As a pro boat designer, I doubt that the unfolding in VW will be usable. It's just too limited. I only use VW for basic documentation when doing boat design. Here is an example having about 200 parts plus profiles made of high grade stainless steel, and nested for laser cutting. The unfolds also included on surface markings for precise positioning of connecting parts. The fit was 100% right.
  5. Claes Lundstrom

    Flattening 3D Geometry - Redux

    The Wireframe mode dialogue comes after having selected Convert to Polygons. The method will flatten the selection to zero height. If yo still want the object to be 3D, you can convert it back to 3D polygons, or set the Plane to Layer Plane in Object info. This allows you to rotate the model in 3D, though still having zero height in the Z- direction.
  6. Claes Lundstrom

    Flattening 3D Geometry - Redux

    How about converting your 3D polygons to Polygons? Menu-> Modify -> Convert to Polygons -> Wireframe mode. If you still want 3D polygons, you can convert it back to 3D again. They will then have the same Z value.
  7. Claes Lundstrom

    Homemade CNC

    I think you can get up to 10W now. They seem to have the disadvantage of generating an oval dot rather than circular, so it might be a good idea to wait for that technology to catch up. A CO2 is still a better technology from a cutting point of view, though also more complex with a huge and somewhat fragile tube, fairly sensitive mirrors, and requiring water cooling. In your case you also need to enclose the machine as the light is very powerful, but also to contain the smoke generated. Yes, I have had one in the past mostly for cutting Plexi glass.
  8. Claes Lundstrom

    Homemade CNC

    A blue laser head should be easy to insert as it basically a small box where age milling uint is located. The Chinese ones are quite inexpensive.
  9. Claes Lundstrom

    Homemade CNC

    It's most likely a question of using the right elements in the drawing. CAM, cutter controller, etc programs are often very limited in what they accept and can process. As a rule, it's therefore recommended to keep things as simple as possible. Avoid symbols, Polylines, Polylines defined as a filled surface (with holes in it), filled objects in general, possible groups, etc. A rounded rectangle is a Polyline and they should be avoided as they very often cause all sorts of problems. Lines, arcs and polygons almost always work. What you can do if you have a problem is to run the Decompose command before exporting, export, and then run Undo to get back to the civilization again. I have found that it almost always solves the problem.
  10. Claes Lundstrom

    Homemade CNC

    Wish VW would support SVG as it gives yet another alternative to exporting to Adobe Illustrator and similar. You can use EPSF and DXF but the DXF import filter in Illustrator and many cutting programs are very unreliable.
  11. The solution to the ZY problem is to have a flip dialogue whenever there is a 3D conversion, in, as well as out. VW does it..... sometimes.
  12. OBJ should work, though VW could do with some improvements, for example a dialog where you state the up direction (Z in VW, Y in many rendering programs). Support for plain colors would be good too (textures seem to work ok both in and out from VW). And a scale factor function, as many of the "blob squeezer" types of programs don't care much about physical scale. Many of them work with very small models, which requires quite a lot of model searching when exporting and importing between CAD and rendering programs.
  13. Claes Lundstrom

    3D silhouette line

    You can of course fake it in a viewport but that does it make it a 3D object. You can however fake it in 3D in OpenGL. OpenGL has one setting in the GL rendering setting for solid objects contours. You can however bypass that by using non filled objects such as 3D polygons, which do have their own setting using the settings in the Attributes palette. In this case I extracted the top face into a 3D polygon rectangle, made it unfilled, adjusted the line thickness and placed it ate the top. As you can see, it clearly differs in thickness (OK I may have overdone it a bit).
  14. Claes Lundstrom

    3D silhouette line

    OpenGL can give you edge lines, but not individually controllable. You have to draw them by hand and give them a thickness. For edges, you can extract a face, and make it unfilled having a line thickness. The same applies to extracting edges as lines or curves and setting the line thickness.
  15. Claes Lundstrom

    Homemade CNC

    Why odd ? Considering one myself. Had two 3D printers, one Co2 laser for cutting plastic parts, two knife cutting machines for cutting cardboard for scale models with printed textures. Considering one of these: https://shop.stepcraft-systems.com/D-Series , mainly because it can carry many tools using the same mechanics. Milling, laser head, knifes, pens, 3D printer heads, etc. Good if you have limited space. Also handy as all these methods have their plus and minus sides.
  16. Claes Lundstrom

    how to stretch a symbol

    If it's 3D, you can trim it with an enclosing solid.
  17. Claes Lundstrom

    Need to draw a Boat

    Been there, done that. All fabrics based examples. Same program.
  18. Claes Lundstrom

    Need to draw a Boat

    I probably have the best program for complex unfolds such a boat hulls and all other parts of a boat for that matter. It does not just try and say if it works or not. It allows you to adjust the shape interactively as a part of the hull fairing, and it's probably the only program on the market that does so. I typically use this dynamic interaction to optimize the design so that it uses a minimal amount of material, and also interacts with the nesting of the panels. The example shows a 34 foot stainless steel boat having just under 200 parts plus various profiles, which we ran directly into laser cutting from the CAD files provided. The laser also added on skin marketings so that for example frames and bulkheads could be fitted without really measuring. We just placed the parts on the reference lines, which dramatically decreased the production time. The model was 100% generated in one program except for the renderings, and some documentation drawings done in VW.
  19. Claes Lundstrom

    Need to draw a Boat

    VW is probably not the first choice for boat design. It's NURBS features are simply too limited. A few steps could bring VW to say average (like say Rhino), for example the ability to nudge control points (like with mesh points), the ability to edit any number of control points in any number of objects at the same time, etc. Rhino is probably the most commonly used program in boat design, though in my opinion it's a misconception to say that Rhino alone is a professional grade boat design software. It's not. It still lacks fundamental stuff like hydrostatics, dynamic cross sectioning, etc. You need to add a set of plug-ins called Orca, though I have to say after having evaluated it, it very much feels like an after construction. It's rather clunky to work with compared to dedicated boat design programs. It's therefore not a top contender in my opinion as a professional designer.
  20. Claes Lundstrom

    Using 2 CAD systems

    No shame in using more than one CAD program. I do it all the time. You can re-paint your house with a screwdriver, but why bother as its' much quicker using a brush.
  21. Claes Lundstrom

    Renderworks or Artlantis Advice

    I actually use a combination of Renderworks, Artlantis and Keyshot. Renderworks biggest advantage is that it's inside VW, so there is no need for conversion. It's well adopted for architectural work with lot's of textures, symbols and resources in that area. Applying textures and getting it right can sometimes be a bit time consuming to get to an acceptable rendering quality, as it lacks a separate rendering window with controllable size and an efficient realtime preview features like the other programs have. Texture mapping can sometimes be a bit frustrating, especially if you mostly work with complex shapes like I do. Artlantis biggest advantage is that it's comparatively straight forward and easy to use once you get the model imported, and provided that the model is well organized. You get from A to B quickly. I have a comparatively old version, and the rendering quality is perhaps not absolutely top notch but not bad either, and since the realtime rendering gives you quick feedback, it often delivers better result than Renderworks based on the often limited time you have to spend on renderings. Exporting from VW to Atlantis can be done through a plug-in, or using .3DS, OBJ, Collada, etc, which works comparatively well. Keyshot also supplies realtime previews, which are probably better in quality than the other two, by a long way. Importing works well using a wide range of formats, such as 3DS, OBJ, STL, VRLM, STEP, IGES, DXF/DWG, though a major drawback is it's inability to add and correct normals, which is a huge problem from VW as normals is a bit of a mess in VW. Normals, which is used to create smoothing in renderings (draw a sphere, convert it into a mesh and render in OpenGL and it looks edgy despite being set to smooth), is basically not working as it should for mesh models, and that is also carried through to polygon mesh based model formats such as 3DS, OBJ, etc. Keyshot is very strong in textures, but it feels more oriented towards product visualizations rather than architectural visualizations, so it may not be an option for all VW users.
  22. Hi, We are looking for a freelance with VW skills, preferably in the Birmingham - Wolverhampton area. The work involves modification and production adjustments of exciting drawings for a product line of super realistic product physical 3D replicas. If you are interested, please contact me for further information at info@touchcad.com /Claes Lundstrom Lundstrom Design
  23. Claes Lundstrom

    still using Artlantis; update?

    I use both, as both have their virtues.
  24. Claes Lundstrom

    3D Shape question

    Very easy to do. Front view. Draw a line. Mirror and Duplicate to vertical. From the top view draw and arc using the three point mode having the same length as the line. Front view, rotate it to 45 degrees. Convert everything to NURBS. Ungroup and then loft into to a surface.
  25. Here is a thread on car modeling if anybody is interested :

 

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