Pentagon Ball - Solid

I have spent hours and different methods trying to construct a solid pentagon ball .
I have tried:
A) Flat pentagons as components, “folding” them, joining the corners, then explode.
B) Extruded pentagons after folding, then using solid-union.
C) Other similar techniques.

Inevitibly, at some of the corners, after making solid, they are not connected at the micro-level.
I can successfully solid-union 3-4 extruded pentagons, but evenutally becomes non-solid.

I am drawing at the meter-level, and have tried various accuracies with no luck. This seems like a defect when converting to solids.

Two examples attached, and can create others if needed.
*Note that the red in the example is me manually joining the lines for a bit of clarity.
Thanks in advance.



shape4Send.skp (1.7 MB)

Post the SKP model.

I made a post back in 2017 after @TheOnlyAaron had done a video.

Here’s the post, and there is a link to Aaron’s video in it.

Uploaded. Various attempts

RTCool Thank you…Funny, I used similar technique, but also several different techniques. The issue is when making it a solid, some of the corners become out of alignment causing it no longer to be a solid.

Click in sequence on the Scenes Tabs of this SU file that I made in 2013.

The dodecahedron is at the end.

Platonic solids.skp (92.5 KB)

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You could also search the EW. I found three extensions that will draw platonic solids.

Use the right angle - 116.56503

Jean, Thank you…It takes the fun out of creating it myself…I do appreciate it.

Interesting…I thought SU only had accuracy to 3 decimals for angles though (?). I had though this is part of my issue.

I will look into these. I still think one should be able to draw it “by hand”, converting to solid.

Modeling a dodecahedron (Solid Group)

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You are confusing the display format (how angles are presented in the UI) with internal accuracy. The internal accuracy is only limited by computer floating point representation. Most likely 16 or 32 decimal places.

Gotcha…it’s definitely snapping to something odd when converting sides to solids.

Mine were constructed by hand.

Click in sequence on the scenes tabs of this SU file that I created more than 15 years ago. It shows how I constructed it by hand.

Dodecahedron.skp (110.9 KB)

I just worked out a way based on that Anne Tyng exercise but haven’t looked at Jean’s yet to compare.

Edit: Just did. Yeah, that’s different, but I can’t read any of the text for some reason.

If you can build this, all that’s left is rotate and rotate + copy.

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I downloaded my file from my post and I can read the text.

To try something, I resaved my file as SU 2017.

Go back to my post and try downloading it again.

Some weird bug. I simply left the file open and did my stuff. I return to that window this morning, and now it’s readable.

Edit: Go to next scene, and still have the problem. Turn off New Graphics Engine and reopen, and all is fine, so it seemed to be some problem with New Graphics Engine.

I’d call this resolved…Great input from everyone…Much appreciated.

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