Please vote on the FABRIC updates to the !COLOUR specification as presented in draft form here.

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The Duplo door hinge socket ddoorhinge.dat primitive works with doors and windows having a circular bar, but not with those having a half-square bar.

  Picture1.png (Size: 3.24 KB / Downloads: 61)
  Picture2.png (Size: 2.91 KB / Downloads: 61)

Upon examination of many parts with door hinges, older and newer, used and unused, I found that the curvature causing the clipping effect is limited to the upper fourth of the shape and that there is a dent roughly at half the height, both contributing to the slightly inward-leaning visual effect apparent when viewing from a distance. I propose that the curvature is modified.

Additionally, the outside slope is straight rather than bent and the height of the base is closer to a third of the shape height than a sixth. I propose that the base is increased to 1.8 LDU and that the outside slope is made straight.

Upon examining a large number of doors and windows, I observed that the bar part is 0.5 (up to 0.60) LDU thinner than previously modeled. All physical parts also have an approximately 0.5 LDU rounding of the corners, which is typically not modeled. However, I do not propose a change to the commonplace 5 LDU half-square geometry.

Here is the proposed new shape for the hinge socket.

  Picture3.png (Size: 3.18 KB / Downloads: 61)
The image shows the ddoorhinge.dat primitive in red (back), the truncated door hinge 2207s02.dat in green (middle) and the proposed new shape in orange (front). The green version has vertical insides, i.e. no curvature for keeping the bar part of the window in place.

  ddoorhingesocket.dat (Size: 517 bytes / Downloads: 0)

  ddoorhingesockethalf.dat (Size: 1.92 KB / Downloads: 0)
The reworked ddoorhingesocket.dat would then still be clashing a little, but as Magnus points out, the 0.5 LDU clash is next to nothing. This way we do not need to touch any of the existing doors.

Based on 2207s02.dat and 51695s02.dat, I propose the below solution for the truncated version of the hinge.

  Picture5.png (Size: 2.18 KB / Downloads: 24)

  dtruncateddoorhingesocket.dat (Size: 588 bytes / Downloads: 0)

Perhaps a hinge primitive for future doors as well?

  ddoorhinge2.dat (Size: 1.08 KB / Downloads: 0)

Many subfiles could be much more reusable as modular building blocks if they contained some way of fixing the position of some elements. For example the interior/underside of many bricks. 76371s02.dat is a good example. If the hem was removed and the 1 LDU offset of the inside notches could be retained from scaling, this part could be reused for any box height, including the 0.25 scaling factor needed for many parts. What about a command that would fix the position of one end of an element?

0 FREEZE -y end relative to -y boundary
1 16 20 49.5 16 1.5 0 0 0 0 45.5 0 -4 0 box4-1.dat

The above code would result in that the 1 LDU offset (counted from the -y direction) would be retained in all scaled versions of the modular subpart.

Another option would be to define variables and then scale the variables rather than the file.

The 2025-03 LDraw Parts Update has been released. This update adds 733 new files to the core library, including 554 new parts and 36 new primitives.

Thanks are due to all the part authors who created or corrected parts for this release. The small, but dedicated, band of reviewers also play an important role in keeping files moving through the Parts Tracker and deserve just as much credit. This update wouldn't have been possible without their dedication and attention to detail.

You can preview the new parts in 2025-03 here, and download the zip-file update or Windows install package here.

Thank you to all the testers and parts authors who continue giving feedback on the PT software. This project would not be what it is without your help.

Orion Pobursky
LDraw.org Parts Library Admin

I made small tool that can be used to get the difference of two LDraw files. This tool was written with the LDraw files exported by Bricklink Studio in mind and does not support references to external submodels. This is the user interface:
   
It has two modes "Partlist" and "Difference Model". An explanation on how to use it and how to install it can be found on the GitHub repo.

Tried to upload a (new) sub-file, got the following error message: 

Parts Tracker File Submit Form
Franklin W. Cain ([email protected]) is not a Parts Tracker registered author

What happened, please?

Let's discuss the orientation of (sloped) Duplo parts.

First of all, sloped Duplo parts have not been oriented as systematically as regular parts. There were some trends (reviewed here https://forums.ldraw.org/thread-28480.html). The existing official parts have several orientations where one major trend seems to be the patterning of a side surface taking precedence over 'slopeness'. This may be partly due to the LDPE editor, where -z is considered the front face of the part and the patterns have been considered the front in common use cases.

Part 11197 is mainly patterned on the side and used in conjunction with part 4198 (https://library.ldraw.org/parts/8177), which is also mainly patterned on the side and oriented in the -z direction.

Therefore, it makes sense to orient part 11197 also in the -z direction.

An alternative would be to rotate all existing sloped parts and their patterns to fit the same convention adopted for sloped regular lego.

Thread for Ideas 2024 sets

102506 Minifigure, Head, Modified Hedgehog (Amy)
102507 Minifigure, Head, Modified Fox (Tails)
102508 Minifigure, Head, Modified Echidna (Knuckles)
104900 Minifigure, Head, Modified Hedgehog (Shadow)
104901 Minifigure, Head, Modified Bat (Rouge)
105029 Minifigure, Head, Modified Hedgehog (Super Sonic)
109630 Minifigure, Head, Modified Hedgehog (Metal Sonic)
3510 Minifigure Costume Tails Fox with White Tips Pattern - Flexible Rubber
3513 Minifigure, Utensil Glove with Spikes
20608 Minifigure Wings Webbed Extended with Neck Bracket