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axhake

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About axhake

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    CAD & Data Manager
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    United Kingdom

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  1. Revit, Microstation/AECOsim, AutoCAD... they have all added this functionality to show/hide over the last several years, it's invaluable when modelling complex models
  2. @Pat Stanford what about the "show / hide" scripts found in one of you older posts? Still don't understand why this functionality hasn't been added to VW as part of the main tool set, most other CAD/BIM software have added this capability which is invaluable for situations like this.
  3. Still dreaming... sorry forgot... I'm using AECOsim at the moment
  4. Yes, it would be nice to have "Rhino.Inside for Vectorworks" but as we can't even import / export the latest Rhino file format (which is now at v7) we need that updating before we can dream of having "Rhino inside"...
  5. "Do you feel you understand sufficiently the maths behind the way NURBS curves are constructed, to say that in theory (assuming all the profiles are perpendicular etc) the NURBS should all be exactly parallel?" You have to remember that curves are represented as length of short lines (faceted), some applications use smaller facets to represent smoother curves. The mathematic behind NURBS and transitions is complicated to answer the question but if the NURBS curve is simple and fairly flat then YES they should be parallel. Where the curve is more complicated is can be mathematic as close as possible, see the example below. Where the curve is tighter and we try and offset we get to a point where the facets fold over, some applications will draw it like this, others will throw up and error and wont complete the action. sometimes the application will see this and remove the fold at this point in this area it can no longer be exactly parallel. It's more complicated than this but I hope this make some sense.
  6. "I have been too lazy to try this for myself out before typing this post... but suspect it's something you've already gone into" Over several months I think I have a flat spot on the side of my head where I have been hitting it against a wall figuring this out and coming up with a workflow that works.
  7. Doesn't matter how you create your first path NURBS curve to make it look right. Once you have it then split (based on previous example, in the middle and then in half again so you are left with 4 paths), your only interested in the ends of each NURBS curve. Now place your profiles (using your workflow as above) at the 5 locations. Delete your original paths and recreate them with interpolation mode passing through each of your profiles. split each path at the profile locations and rebuild............ Until VW give NURBS some love and attention this is the best we can do
  8. Looks like you are getting into this now. "am I right in saying that all of those NURBS parts I've drawn are not necessarily exactly parallel?" They should be, there are two ways to check this: a) Copy your profiles and paths and change one end profile to a NURBS, then select that profile and one of the paths, using "Extrude along a path" create the extrude. Now go to the other end, switch to Wireframe and see if the extrude aligns with your end profile. If you have accurately placed your start and end profiles it will align, if not they wont. b) For a 2D path switch to Top/Top Plan View and using the "Offset Tool" select one of the paths and offset, zoom into the end of the offset line and see if it aligns with the profile. If it does then the profile is perpendicular, if not use the rotate command and rotate the profile (Note: this only works with a path that is 2D) As you hadn't left the paths in your file I recreated your profile and created paths between them. moved the path and replaced the profile on the ends using the workflow to align the profile to end of paths as in my video and checked, all aligned OK so we know that the profiles have been placed square to the ends of the path ☺️ Checked both methods as above and all aligned OK. I then run my network to re-create each NURBS between profiles with 30 points. Switch to 3D View and changes display to "Polygon > Shaded" far easier to see what's happening. Then measured each crease line, I get 688 - 689 consistently so there is a very small rounding error., try setting your units to one decimal place and see what the numbers you get. The rounding error using this workflow are far smaller than if you were to just use extrude along a path or loft. Now, if you go back to your original profiles copy them, place a NURBS curve through the same corner of each profile, then using the "Split Tool" split the path at the middle profile, then split the two NURBS in half again so that you are left with 4 path lengths. Place a copy of the profile at the new end locations so that you have 5 profiles. Add additional paths to the other corners as before, split these at the profile locations. Select all 16 path NURBS curves and rebuild them. Follow the workflow you have been using and then check the length of each as above.... the accuracy should improve. I am now getting 689 - 690. So form this we can assume the more profiles used to form the shape we are trying to model the more accurate the final geometry will be.
  9. Hi, will have a look at this and get back to you ASAP.
  10. Yep, that will do it. I suggest splitting the NURBS curve so that when applying my workflow to smooth the NURBS curve it actually passes through the point (to be more accurate) and not along the facet if that makes sense. Splitting the NURBS curve at that point is Key point to do.
  11. Hi @line-weight, hopefully this will show you how to get things aligned. Aligning wP to end of line.mp4
  12. Sorry @line-weight, have just exported to 2018 and added to my original post with the other files. Hope that helps
  13. It would be really useful (and consistent) to have a search / filter within the create “New Class” window when selecting “Import Classes”. If we have a long list of classes within a file to chose from it can be time consuming to have to keep scrolling through long lists of classes. We have the search / filter in the other class / layer panels so why not here?
  14. I've added an update to another post that is relevant to this one

 

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