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Could not project the selected entities into the current sketch.

famadorianfamadorian Member Posts: 389 ✭✭
Here, I'm trying to project the line entity onto the sketch, but it wants me to pick a point, like the end of the line instead. 

I can do that, but it should be able to project this line as a point onto the sketch;)


Best Answer

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 3,958
    Accepted Answer
    Projecting a line normal to the sketch plane is not supported, since the result is just a point that you can reference anyway without projection. What would happen if the line was no longer perpendicular to the sketch plane? The point would turn into a line and your sketch would break.
    Director, Technical Services, EMEAI

Answers

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 3,958
    Accepted Answer
    Projecting a line normal to the sketch plane is not supported, since the result is just a point that you can reference anyway without projection. What would happen if the line was no longer perpendicular to the sketch plane? The point would turn into a line and your sketch would break.
    Director, Technical Services, EMEAI
  • alnisalnis Member, Developers Posts: 383 EDU
    edited December 2020
    Edit: oops, I started writing this before I saw @NeilCooke's post, sorry!

    The problem is that you would get undefined behavior if the line gets changed/rotated earlier in the model tree. Should the "use" constraint now make the point coincident with an endpoint of the line? The line's midpoint? Change the sketch geometry to a line and try to reconnect any constraints? I think it's cleanest if Onshape doesn't let you get into this situation by not letting you project geometry that creates degenerate curves/weird setups.

    However, it would be nice if there were more of an explanation for why it can't project the line.
    Onshape Intern | Get in touch: [email protected] | My personal site: https://alnis.dev
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