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Offset Spline Distance

famadorianfamadorian Member Posts: 300 ✭✭
I've drawn a spline and I'm creating an offset, but when dragging a bit too far, the offset spline just disappears and that's one of the error messages. 

It acts as if there is some limit it can offset from?


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Comments

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,322
    Offset too far and the spline will self-intersect
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
  • famadorianfamadorian Member Posts: 300 ✭✭
    edited December 2018
    NeilCooke said:
    Offset too far and the spline will self-intersect
    ok, but does it self intersect the spline I've drawn here (red pen)?: The reason I ask is because it won't go any further than what's shown in here (blue spline):


  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,322
    Not sure what you mean? The original spline has two convex regions whose curvature is smaller than the value you want to offset by. 
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
  • famadorianfamadorian Member Posts: 300 ✭✭
    edited December 2018
    I'm not sure I understand. Because it has convex regions that will end up going into eachother, that's normal for an offset operation, is it not? What if this is a road? Can we not build a road here because we have two convex regions whose curvature is smaller than the value we want to offset by?

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,322
    Sorry, I meant to say concave. Your image with offsets has no intersecting regions, but if you offset some more, here is where the problem would be:


    Splines in a 2D parametric sketch solver are somewhat different than what you can do with a truckload of tarmac :)

    I would suggest splitting the spline where the areas of high curvature are, offset them, then manually trim them afterward. That will give you sharp vertices that you can fillet if you want.
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
  • famadorianfamadorian Member Posts: 300 ✭✭
    Are you saying we can't do something like this in Onshape?:


  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,322
    Correct - please submit an improvement request to add this capability.
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
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