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grid of vertices on a surface

adamohern
adamohern Member, OS Professional Posts: 216 PRO
in FeatureScript
Is there a way to create a grid of vertices on a surface?

Comments

  • adamohern
    adamohern Member, OS Professional Posts: 216 PRO
    Note that by "surface" I mean a freeform organic surface (un-trimmed), and by "grid" I might mean either a regular grid by radial distance between points, or a surface UV parameter grid.
  • kevin_o_toole_1
    kevin_o_toole_1 Onshape Employees, Developers, HDM Posts: 565 image
    evFaceTangentPlane takes a parameter in UV space and gives you a point and normal on the surface.

    Note that right I don't think we make any guarantees about the parameterization being predictable, though for anything isometric to a plane it will be a standard grid.
  • ilya_baran
    ilya_baran Onshape Employees, Developers, HDM Posts: 1,273 image
    I would only add that while cones and extruded splines are isometric to planes, but their parametrization won't generally be isometric.
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc
  • adamohern
    adamohern Member, OS Professional Posts: 216 PRO
    Makes sense, guys. Thanks. And I don't suppose you have a means of measuring a unit distance either in UV or Euclidean space? For example, create a point on surface 1m due East of a reference point as measured (a) across the surface and (b) as the crow flies?
  • ilya_baran
    ilya_baran Onshape Employees, Developers, HDM Posts: 1,273 image
    For "as the crow flies", I can imagine constructing a circular arc and intersecting it with the surface (using e.g. evDistance).
    For "as the geodesic crawls", that's not really possible at this time in general.  Approximations might include getting a curve on the surface (e.g. via an intersection or a split) and using arclength parameterization along it.
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc

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