Paper fold-up in manual has an error
I have found an anomaly in the Wikibooks OpenSCAD User Manual.
In particular the section:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#polyhedron
makes use of the following image which has a problem:
https://commons.wikimedia.org/wiki/File:Polyhedron_Prism.png
In the 3D solid on the left of the image the line segment 1,5 is clearly the hypotenuse to the right triangle 1,2,5, whereas in the 2D fold-up on the right of the image the hypotenuse to the right triangle 1,2,5 is drawn as segment 1,2.
I notice these sorts of things only because I'm a fairly high i.q. individual who pays particular attention to details and patterns. This particular anomaly was discovered while conversing on the phone with a friend of mine a few months ago.
I was just wondering if there are any prizes awarded for discovering these sorts of anomalies. Perhaps someone set a trap for me, deliberately making this mistake, and hoping that a smart individual would be attracted to it.
Respectfully,
Nerius
Nerius,
No, no prizes, just a mutually helpful community. Thanks for reporting it.
Turns out that the unfold of the triangles should be from rectangle A.
From: Nerius Landys [mailto:nlandys@yandex.com]
Sent: Sun, 25 Sep 2022 09:08
To: OpenSCAD general discussion
Subject: [OpenSCAD] Paper fold-up in manual has an error
I have found an anomaly in the Wikibooks OpenSCAD User Manual.
In particular the section:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#polyhedron
makes use of the following image which has a problem:
https://commons.wikimedia.org/wiki/File:Polyhedron_Prism.png
In the 3D solid on the left of the image the line segment 1,5 is clearly the hypotenuse to the right triangle 1,2,5, whereas in the 2D fold-up on the right of the image the hypotenuse to the right triangle 1,2,5 is drawn as segment 1,2.
I notice these sorts of things only because I'm a fairly high i.q. individual who pays particular attention to details and patterns. This particular anomaly was discovered while conversing on the phone with a friend of mine a few months ago.
I was just wondering if there are any prizes awarded for discovering these sorts of anomalies. Perhaps someone set a trap for me, deliberately making this mistake, and hoping that a smart individual would be attracted to it.
Respectfully,
Nerius
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I added a note to the Wiki, corrected the code in example 3, and will post a new image once I label the points/faces.
From: Michael Marx [mailto:michael@marx.id.au]
Sent: Sun, 25 Sep 2022 10:13
To: 'OpenSCAD general discussion'
Subject: [OpenSCAD] Re: Paper fold-up in manual has an error
Nerius,
No, no prizes, just a mutually helpful community. Thanks for reporting it.
Turns out that the unfold of the triangles should be from rectangle A.
From: Nerius Landys [mailto:nlandys@yandex.com]
Sent: Sun, 25 Sep 2022 09:08
To: OpenSCAD general discussion
Subject: [OpenSCAD] Paper fold-up in manual has an error
I have found an anomaly in the Wikibooks OpenSCAD User Manual.
In particular the section:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#polyhedron
makes use of the following image which has a problem:
https://commons.wikimedia.org/wiki/File:Polyhedron_Prism.png
In the 3D solid on the left of the image the line segment 1,5 is clearly the hypotenuse to the right triangle 1,2,5, whereas in the 2D fold-up on the right of the image the hypotenuse to the right triangle 1,2,5 is drawn as segment 1,2.
I notice these sorts of things only because I'm a fairly high i.q. individual who pays particular attention to details and patterns. This particular anomaly was discovered while conversing on the phone with a friend of mine a few months ago.
I was just wondering if there are any prizes awarded for discovering these sorts of anomalies. Perhaps someone set a trap for me, deliberately making this mistake, and hoping that a smart individual would be attracted to it.
Respectfully,
Nerius
http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient width=www.avg.com
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