Unofficial File parts/20953.dat
part image
File Header:
0 Brick Round Sphere  2 x  2 x  1 2/3 with Stud
0 Name: 20953.dat
0 Author: Massimo Maso [Sirio]
0 !LDRAW_ORG Unofficial_Part
0 !LICENSE Redistributable under CCAL version 2.0 : see CAreadme.txt

0 BFC CERTIFY CCW

0 !HISTORY 2016-03-18 {LEGO Digital Designer} Original part shape
0 !HISTORY 2016-05-27 [Sirio] File preparation for LDraw Parts Tracker

Status:
1 subfile isn't certified. (SN)
Size: 187921 bytes
Reviewers' certifications:
GeraldLasser=novote
Required (unofficial) subfiles:
Related (unofficial) subfiles:
(none)
File reviews and updates:
At Fri May 31 16:50:01 2019, the file was initially submitted.
Submitted by: Sirio
Comments:
In this first version I used an external surface without primitives to precisely follow the profile of the sphere (center 0, 17, 0, radius 20).
Since the extremes are missing, I approximated the sphere with 15 conical surfaces. The vertices were calculated with Primgen2.
I have considered that the surface will then be patterned.
In the same way, to better connect the external and internal surfaces, I used many primitives in the 48-sided version in the subpart.
This also to connect the fillets to the conical surfaces.

At Fri May 31 22:55:02 2019, the following review was posted:

Reviewer: GeraldLasser
Certification: novote
Comments:
I started tooo long ago with this part but did not finish, I also used a customer outer surface.

The shape looks good to me, size fits as well

At Fri May 31 22:55:02 2019, the following review was posted:

Reviewer: GeraldLasser
Certification: novote
Comments:
That was the discussion back then

https://forums.ldraw.org/thread-22435.html?highlight=20953