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Organic Surface?

cache_river_millworkscache_river_millworks Member Posts: 14 PRO
edited September 1 in FeatureScript
Needs some organic shaping on the face of the leaves. Anyone have a solution to do this within Onshape? I can export it as an stl and shape it, but it would be amazing to keep it as a SolidWorks file.






Comments

  • kevin_o_toole_1kevin_o_toole_1 Onshape Employees, Developers Posts: 297
    edited September 1
    Here's a feature that provides manipulators for modifying a surface. It simply performs a loft and a replace face with a nicer interface.
    https://cad.onshape.com/documents/2c277b8c65f802c616cd16d4/v/8460dd533e59ecf92219c86b/e/cf6e6e7f9227d2ebbc72d1fa

    I'd recommend using split face first to give yourself some workable pieces, then applying sculpt. If you need to do patch-work at the end, Onshape's native (month-old) fill surface tool is great for that.

    Naturally, any tool which provides artistic surface embellishments, like sculpt, has the possibility of looking poor when you make upstream changes, since your modifications are defined on parametric points of a surface, and the parameterization could shift underneath you. However, if you're okay with touching up pieces of sculpting, this can get you rolling without converting away from the underlying B-rep format.

  • brucebartlettbrucebartlett Member, OS Professional, Mentor Posts: 1,157 PRO
    Interesting feature, I just had a play and very easy to use. I will be interested to see if this work on the leaves.

    @maximilian_schomm @kevin_o_toole_1 oole_1 ,  I can't seem to select features from the face for a re-edit. 

    https://cad.onshape.com/documents/8f92f8d5efd246729c42b2a0/w/292662225264a53fef180613/e/316fc7a70248bed8f0a38a40




    Engineer ı Product Designer ı Onshape Consulting Partner
    Twitter: @onshapetricks  & @babart1977   
  • kevin_o_toole_1kevin_o_toole_1 Onshape Employees, Developers Posts: 297
    In the example you gave, the sculpt fails because it didn't preserve the edge you split the face along.

    The split face was on a diagonal line, and, naturally, what you wanted the tool to do was keep that line in place as you sculpted, joined with the rest of the body. Unfortunately, the sculpt tool remaps the whole UV rectangle it shows, which changes the geometry along your split line, and causes the underlying replace-face to fail.

    A simple workaround is to make sure you only split faces along the UV lines that parameterize the face. For a planar face, this pretty much always means global verticals and horizontals. I've made that change here and the feature works fine:
    https://cad.onshape.com/documents/ee34d5bf0d7b9889a6678d13/w/706477875bf94219494f9f62/e/c62c78192c045ced204f813c
    The other half of this workaround is: when you do need to split things up along different lines, split the whole part, then use fill surface to patch things up afterwards.

    Obviously neither of these workarounds are ideal. The only real fix would be totally rewriting this feature to into one which does enable preserving those end conditions. Onshape is currently working on improving our surface modeling capabilities across the board, but our main focus will be on surfacing tools that are robust and parametric, rather than more freeform tools like this. So I wouldn't hold your breath waiting on any improvements to this particular custom feature.
  • brucebartlettbrucebartlett Member, OS Professional, Mentor Posts: 1,157 PRO
    edited September 2
    Thanks, @kevin_o_toole_1 I was just playing to see whats possible. Looking forward to the proper surfacing capabilities, I have never really had to use surfaces in professional projects but it's always fun to play with them and prove the capability of Onshape. These tools are definitely what your consumer product design house's need. 
    Engineer ı Product Designer ı Onshape Consulting Partner
    Twitter: @onshapetricks  & @babart1977   
  • cache_river_millworkscache_river_millworks Member Posts: 14 PRO
    Kevin, that looks very promising, exactly what I was imagining. I will see if I can use this and get back with you.

  • cache_river_millworkscache_river_millworks Member Posts: 14 PRO
    This tool is an excellent step in the right direction.
    However unless I can manipulate the shape of the grid, it will be difficult to use well. The Grid shape is very important. Needs to flow with the shape of the leaf.

    I was able to sculpt the correct shape of the leaves as an STL, but that's not what we need. If the grid were adjustable, this same shape could be obtained with the SF feature.












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