Unofficial File parts/s/u8012s01.dat
part image
File Header:
0 ~Offset Tab for Mursten Door and Windows
0 Name: s\u8012s01.dat
0 Author: N. W. Perry [Plastikean]
0 !LDRAW_ORG Unofficial_Subpart
0 !LICENSE Redistributable under CCAL version 2.0 : see CAreadme.txt

0 BFC CERTIFY CCW

Status:
Needs more votes. (CN)
Size: 678 bytes
Reviewers' certifications:
MagFors=certify
Required (unofficial) subfiles:
(none)
Related (unofficial) subfiles:
Mursten Door 1 x 2 x 3 Left
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8012.dat
Mursten Window 1 x 2 x 2
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8019.dat
Mursten Window 1 x 3 x 2
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8020.dat
Mursten Window 1 x 4 x 2
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8021.dat
Mursten Window 1 x 6 x 2 Triple
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8022.dat
Mursten Window 1 x 6 x 2 with Shutters
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8023.dat
Mursten Window 1 x 6 x 3 Panorama
Status: 1 subfile isn't certified. (CSF)
Download: parts/u8024.dat
Mursten Door 1 x 2 x 3 Right
Status: 1 subfile isn't certified. (CSN)
Download: parts/u8041.dat
File reviews and updates:
At Thu May 13 14:55:02 2021, the file was initially submitted.
Submitted by: Plastikean
Comments:
For part fixes u8012 and u8019-u8024. Discussion here: https://forums.ldraw.org/thread-24620.html

At Thu May 13 20:00:01 2021, the following review was posted:

Reviewer: MagFors
Certification: hold
Comments:
Please use 1-4chrd and 2-4chrd primitives instead.

At Fri May 14 01:10:01 2021, the following review was posted:

Reviewer: Plastikean
Certification: novote
Comments:
Could you expose the rationale for this? I do remember reading something about it, but honestly can't remember where to look.

At Fri May 14 07:00:01 2021, the following review was posted:

Reviewer: MagFors
Certification: hold
Comments:
It's all about that vertex in the centre of the disc primitive.
Using chrd prims instead of disc saves triangles and avoids an obvious T-junction.


Using 1-4chrd will reduce the number of triangles. From 10 to 8
4 12 4 -8 0 0 -8 0 0 8 0 4 8 0
1 12 0 -8 0 4 0 0 0 0 -4 0 1 0 1-4disc.dat
1 12 0 8 0 4 0 0 0 0 4 0 1 0 1-4disc.dat

4 10 9 12 0 13 8 0 13 -8 0 9 -12 0
1 10 9 -8 0 4 0 0 0 0 -4 0 1 0 1-4chrd.dat
1 10 9 8 0 4 0 0 0 0 4 0 1 0 1-4chrd.dat


Using 2-4chrd will also reduce the number of needed triangles. From 20 to 16
4 13 0 8 2 0 -8 2 4 -8 2 4 8 2
4 13 0 -8 2 0 8 2 -4 8 2 -4 -8 2
1 13 0 -8 2 -4 0 0 0 0 -4 0 -1 0 2-4disc.dat
1 13 0 8 2 -4 0 0 0 0 4 0 -1 0 2-4disc.dat

1 10 9 -8 2 -4 0 0 0 0 -4 0 -1 0 2-4chrd.dat
1 10 9 8 2 -4 0 0 0 0 4 0 -1 0 2-4chrd.dat
4 10 5 8 2 5 -8 2 13 -8 2 13 8 2

At Fri May 14 20:25:01 2021, the following review was posted:

Reviewer: Plastikean
Certification: novote
Comments:
Makes sense. Funnily enough, this was my guidance for leaving that T-junction: https://forums.ldraw.org/thread-23422-post-32027.html#pid32027
But I suppose that applies only to the ndis and not to a disc.

When is it preferable to use a disc primitive?

At Fri May 14 20:25:01 2021, a new version of the file was submitted.
Submitted by: Plastikean
Comments:
Replaced discs with chords

Existing certification-votes were deleted.
At Sat May 15 10:20:01 2021, the following review was posted:

Reviewer: MagFors
Certification: certify
Comments:
Only when the vertex in the origin of the disc prim is used in the design.
In most cases the chrd is the better choice.