SketchUp Skill Builder: Icosahedron

[@Chaosstorm2005vl]

This is the first time I've seen that way of resizing. Thank you!

[@mekkler]

Me too, using it from now on too.

[@christinaeneroth675]

This is lovely to see! Did you know I have an icosahedron lamp in the ceiling right above my head at this very moment? Personally I'd use a group for the temporary pentagon to not be interrupted by the Create Component dialog and since I know I'm not going to instance it. I think this examples illustrates quite nicely the difference between components and groups.

[@Frostyflytrap]

I had no idea you could use the Measure Tool to scale objects to precision, thanks a lot for showing that!

[@GeorgeSA5]

Frostyflytrap Although I'm not really interested in drawing a whatyoumacallit thing (even though it is quite cool) resizing with the tape measure tool is for me also the lesson from this video 😁

[@Frostyflytrap]

Exactly! What I really love about these skill builder tutorials is that it doesn't just teach you how to make a shape, it teaches you how to make other things from the techniques you learn from this video.

[@bennthirteen3701]

that`s where sketchup is cool, just minimal tools and building it up from the fundamentals,it shines there.

[@MrCoillote]

I do ask for it ! you make the job ! and you do it well. Bravo, beau boulot.

[@Pascaldacashcow]

After the resize of the Pentagon, I could not get it to centre again on the origin and found it snapping to anything but a logical position. Any ideas why this might occur or how i might get the pentagon to show its centre when moving it back to the origin for the next step. Thanks.

[@MikkeyFacts]

Dodecahedron is indeed more fun to say, I won't challenge you on that one

[@jeronimobeta]

I try and try and I don't get a single solid, edges don't touch each other in many cases.

[@mckinnon421]

That was so cool..and educational!

[@sdspivey]

Minus 1 for leaving the extra face and not reversing the faces initially.

[@bearthompson6506]

Impressive.

[@gavincarle3063]

Ah. the Gyro-elongated pentagonal bipyramid, the best of all shapes

[@muniracaceres1072]

now it won't let me make de arc of 999 sides so i can't do it

[@SketchUp]

No need for arcs with 999 segments. No need for arcs at all for this lesson.

[@muniracaceres1072]

@@SketchUp it doesn't makes a solid. How do i fix it sometimes it works sometimes don't

[@rogerdudra178]

I agree, dodecahedron is more fun, but you made a dynomite Icosahedron, too.

[@rahadianrihadi]

I never thought measurement tools can do that.. 😨

[@kenhaley4]

OK, I tried to duplicate this, and when I copied the triangle components to a new location, exploded them, and finally grouped them into a single group, it was NOT a solid group. Zooming in closely into one of the vertices, I noticed that the triangle corners do not coincide perfectly--off by a few thousandths of an inch. What do you do to keep this from happening? There's another cool way that avoids this problem: Draw a rectangle, sizing it to show "golden section." Make it a group and make two copies. Rotate and move all three rectangles so that their centers are at the origin and oriented like this: www.goldennumber.net/wp-content/uploads/2012/05/golden-rectangle-3d.gif. Now connect all the corners with lines, and voila...there's your icosahedron. You'll need to move the rectangles out of the way, reverse some of the faces, and delete a bit of extra geometry leaving just the icosahedron,...which is now a solid group.

[@kenhaley4]

I solved my problem. Before starting, open the Model Info window (on a PC, that's under the Window menu), and click Units in the left pane. Uncheck "Enable length snapping" and "Enable angle snapping". It probably wouldn't hurt to set the precision values to the smallest available choices. Now, when rotating the first triangle into position, it lands on the intersection point exactly, and the rest of the model falls perfectly into place.

[@WillWilliams2001]

@@kenhaley4 I have often had this problem. I will change my settings now and perhaps stave off further frustration so serious that it could easily lead to a "drinking problem." Ha! (Insert smiley face here)

[@刘晓金]

@Ken Haley Hello, I think you don't solve the problem, because the cause of the problem is not caused by trap setting, but because of software problems of its own, the circle is not round, in the software instead of polygon approximation round, so the first step in spinning triangle does not rotate to the position of the most accurate, so I don't think this is a good way to create a polyhedron.

[@rawtee8957]

great Tutorial

[@adilsonmenezessollo7149]

very good solution ..." no math "!!!

[@MrCoillote]

in fact there is most geometrical knowledge that we call "geometrie descriptive" that is a form of not-so-known mathematic knowledge.

[@Bradleydesignonline]

Okay Bucky, nicely done! Now draw an icosidodecahedron.

[@muniracaceres1072]

the arch must be 999 sides!!!!

[@jakobhovman]

"3D Sketch Math"...! Sketchup does the math...and Geometry...We just drive it.

[@mekkler]

I would have used the mathy way to make it. Your way is easier.

[@camilesmile]

just copy and flip along . no need to take 30 minutes

[@muniracaceres1072]

nop, i can't do it!!!!!