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enter image description here

Find the side view and simple 3d associated with these views.It is given that there are no hidden lines (lines which are not visible from the side or top view).

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closed as too broad by Ankoganit, Peregrine Rook, JonMark Perry, boboquack, Beastly Gerbil Mar 5 '17 at 12:37

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ You can edit posts with the "edit" button under the tags. I've deleted your old post for you - next time, just edit it rather than posting a new one. $\endgroup$ – Deusovi Feb 26 '17 at 18:35
  • $\begingroup$ Does this figure have to be closed? (Can it have lines) $\endgroup$ – suomynonA Feb 26 '17 at 19:07
  • $\begingroup$ Perhaps the puzzle statement could mention whether the object is transparent or opaque $\endgroup$ – humn Feb 26 '17 at 21:12
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As the top view has 90° symmetry, a 90° side view...

...can look exactly the same as the front view.

A 45° side view can be more interesting, ...

...showing an almost-elliptical profile, √2 times as wide, and one of four edges that go halfway down, to the equator.   Initial diagram:
                     

Improved diagram   (construction from cylinders is described later):

The bottom view, for those interested, ...

...is a square, the same as the top view but without the diagonal lines because the bottom half is rounded.

This can be constructed by...

...beginning with this intersection of cylinders:

     

That produces the following shape, whose edges below the equator are then rounded off, to remove those lines, without affecting the orthogonal profiles or top view.

           

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  • $\begingroup$ could you draw simple 3d of this? $\endgroup$ – matin Feb 26 '17 at 20:24
  • $\begingroup$ I don't see how this works. $\endgroup$ – greenturtle3141 Feb 26 '17 at 20:54
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    $\begingroup$ I see no problem with this answer. The 45° should have a ratio of $1:\sqrt 2$, which is not too well-illustrated in your drawn image, though :-) $\endgroup$ – Carl Löndahl Feb 26 '17 at 21:36
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    $\begingroup$ @humn To make the answer more convincing, maybe you can provide a proof sketch that there exists such a rounded-off construction? It is pretty clear that the two orthogonal middle circles (passing trough the crossing intersections) form perfect circles and, thus, the silhouettes will be perfect circles too. Removing the corners will not affect that property. $\endgroup$ – Carl Löndahl Feb 26 '17 at 21:52
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    $\begingroup$ The diagram is more accurate and explanatory now, @Carl Löndahl, thank you for the feedback $\endgroup$ – humn Feb 27 '17 at 0:40
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Sides could be either of two, or maybe even an infinite amount inbetween , depending where you put the point in the middle. These two models are kinda low poly. So you have to imaginethe curvature a bit Here is a link to watch the second one online: a360autodesk

  1. picture middle point to the top

enter image description here

  1. picture middle point to the bottom

enter image description here

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  • $\begingroup$ Could you maybe provide a link to an STL viewer so we can see it there? I'm having a hard time trying to figure out no. 2 $\endgroup$ – Beastly Gerbil Feb 26 '17 at 20:07
  • $\begingroup$ Here is a Link a360autodesk $\endgroup$ – Tobi Obeck Feb 26 '17 at 20:23
  • $\begingroup$ Thanks! Maybe edit it into the question for others to be able to see it too $\endgroup$ – Beastly Gerbil Feb 26 '17 at 20:24
  • $\begingroup$ What software do you use to construct the 3d images? $\endgroup$ – suomynonA Feb 27 '17 at 1:18
  • $\begingroup$ Cinema4d. Something similar should be possible with blender (free alternative) $\endgroup$ – Tobi Obeck Feb 27 '17 at 1:25
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Second try, some kind of XBOX logo shaped cutout on top of a cylinder:

enter image description here

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A possible figure would be the following:

Top view:
enter image description here
Front view:
enter image description here
Side view:
enter image description here
View the design here. (But you won't be able to see the lines for some reason)

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  • $\begingroup$ could you draw simple 3d of this? $\endgroup$ – matin Feb 26 '17 at 20:18
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I made a quick 3D model on tinkercad which can be viewed here

It seems it is a cylinder, with a couple of rings going round it which form a cross on top. Here is the suspected side view:

enter image description here

I know that there aren't any lines which aren't visible from the top or front, but I'd argue that the rings are a single line, as a circle has a single side, so that these lines are in fact visible from the top.

Apart from that the top view is a square with a cross (imagine the black rings were flat):

enter image description here

And the front view is a circle:

enter image description here

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  • $\begingroup$ It can't be a sphere, rings or no rings, if it looks like a square from the top. $\endgroup$ – Rand al'Thor Feb 26 '17 at 19:22
  • $\begingroup$ @randal'thor sorry meant cylinder $\endgroup$ – Beastly Gerbil Feb 26 '17 at 19:23
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    $\begingroup$ Doesn't this have "lines which are not visible from the side or top view"? $\endgroup$ – humn Feb 26 '17 at 19:30
  • $\begingroup$ @humn ah didn't see that. However it could be argued that the rings are single lines which are visible from the top $\endgroup$ – Beastly Gerbil Feb 26 '17 at 19:48

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