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Latest Threads
0.8.50 Beta Released (bug...
Forum: Parts Author Tools
Last Post: Philippe Hurbain
2 hours ago
» Replies: 3
» Views: 109
LDraw.org Part Numbering ...
Forum: Official File Specifications/Standards
Last Post: Willy Tschager
4 hours ago
» Replies: 1
» Views: 312
error with Ribbed Hose
Forum: LDraw Editors and Viewers
Last Post: N. W. Perry
8 hours ago
» Replies: 5
» Views: 288
Lego Description Language...
Forum: General LDraw.org Discussion
Last Post: SNIPE
Yesterday, 20:31
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» Views: 75
Correcting 3815, 3816, 38...
Forum: Parts Authoring
Last Post: Magnus Forsberg
Yesterday, 17:54
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3068bpx1 is not the right...
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Yesterday, 17:15
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LDCad Set PBG generator
Forum: LDraw Editors and Viewers
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Tiles 1 X 8 from latest A...
Forum: Part Requests
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Yesterday, 1:02
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Identify Completed Part R...
Forum: Website Suggestions/Requests/Discussion
Last Post: Gerald Lasser
2020-05-31, 23:53
» Replies: 2
» Views: 58
42115 Lamborghini Sian, N...
Forum: Part Requests
Last Post: Gerald Lasser
2020-05-31, 22:27
» Replies: 0
» Views: 282

  LDraw.org Part Numbering Draft
Posted by: Orion Pobursky - Yesterday, 22:52 - Forum: Official File Specifications/Standards - Replies (1)

The draft of the Official Part Numbering Spec is done can can be found here:

This is a reorganized and reformatted version of this:

Please read it over and make comments. I'm sure there are errors and clarifications that need to be made before I send it to the LSB for ratification. 

This doc is intended to be used in conjunction with:
These rules would make that document too long and unwieldy.

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  Lego Description Language (LDL)
Posted by: SNIPE - Yesterday, 20:31 - Forum: General LDraw.org Discussion - No Replies


Today, I'd like to share a project I've been working on for a few years.

It is the idea of being able to describe lego models without the use of physical or digital lego, and in a way that is:

  • Very close to English and not too unintuitive
  • Has fast development time
  • Is cross platform and highly accessable
  • Is powerful enough to represent any possible combination of LEGO parts or building techniques
  • Capable of being translated by a computer into a digital model (though this goal was originally part of a seperate "lego programming language" project)
  • Flexable parts, hinges, etc are also possible
  • Still makes the user learn about lego techniques
  • Can be converted into native LDRAW script
After a few failed ideas I think I have got a good solution but the clever thing about it is that it takes what is good about low level languages and what is good about high level languages and combines them in a harmonious way.

It works by just having the bare minimum amount of information to build a lego model:
Part type, Part ID, Primative type, Primative ID

These are simply macros for certain paramaters in an ldraw script, that's it!. Let's take a few examples:

3005 B1 c1 = 3005 B2 s1
/* place  clutch1 of BRICK1 of type 3005 onto stud1 of BRICK2 of type 3005 */
32316 L1 ph1 = 2780 PI1 pi1
/* place pinhole1 of LIFTARM1 of type 32316 onto pin1 of PIN1 of type 4274 */
/* Now what if we want to attach these two assemblies together? easy: */
3024 PL1 c1 = PIN1 c1
PL1 s1 = B2 C1
/* place clutch1 of PLATE1 of type 3024 onto clutch1 of PIN1.
   place stud1 of PLATE1 onto clutch1 of BRICK2 */

This syntax also means you can create helper assemblies in order to position more complex parts then simply DEL(ete) the helper assemblies, which after all is what you do in ldd/ldcad anyhow therefore SNOT and advanced building tequniques are possible including the ability to flex certain types of parts. So the syntax has been tried and tested and can stand up to huge and or complex models.

There are a few syntax shortcuts so far such as part/primative ranges or lists (3003 B1:B50 c1) (3005 B2 c1,c2,c3,c4,), exact part positioning co-cordinates (B2 <25,87,53>) and the IDE will also help you by having tools which leads me onto the bit where I need help from the LDRAW community: building the compiler/IDE:

The idea (assuming you are not just typing into notepad) is to have a C program read the LDL syntax and parse it into native LDRAW script but also display the digital model in real time, as you type, in a graphical output window.

This post is already kinda long so feel free to ask about the full syntax, the IDE, or the compiler, or anything else more below.

Regards, Snipe

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  error with Ribbed Hose
Posted by: Franklin W. Cain - Yesterday, 12:08 - Forum: LDraw Editors and Viewers - Replies (5)

Tried to auto-generate a flexible component (a 3-stud length ribbed hose) using LD Design Pad, and got a bad result. 

What did I do wrong?  


0 Begin Flex Object
1 16 7.5 0 0 0 -1 0 -1 0 0 0 0 1 79.dat
1 16 56.61 9.71 0 -0.383 0.924 0 0.924 0.383 0 0 0 1 79.dat
1 16 13.801 -0.029 0 0 -1 0.009 0 0.009 1 -1 0 0 80.dat
1 16 20.001 -0.166 0 0 -0.999 0.035 0 0.035 0.999 -1 0 0 80.dat
1 16 26.189 -0.52 0 0 -0.997 0.079 0 0.079 0.997 -1 0 0 80.dat
1 16 32.291 -1.44 0 0 -0.976 0.218 0 0.218 0.976 -1 0 0 80.dat
1 16 33.466 -3.175 0 0 0.866 -0.5 0 0.5 0.866 1 0 0 80.dat
1 16 33.502 -2.188 0 0 -0.675 -0.738 0 -0.738 0.675 -1 0 0 80.dat
1 16 38.108 1.32 0 0 -0.882 -0.471 0 -0.471 0.882 -1 0 0 80.dat
1 16 43.651 4.09 0 0 -0.906 -0.422 0 -0.422 0.906 -1 0 0 80.dat
1 16 50.057 6.942 0 0 -0.919 -0.394 0 -0.394 0.919 -1 0 0 80.dat
0 Start Point (10.7 0 0) Control Point 1 (70.2 0 0)
0 Control Point 2 (-1.3248 -14.3041 0) End Point (53.6532 8.4844 0)
0 Number Of Segments: 9 Curve Length: 55.8031
0 End Bezier Curve

Attached Files Thumbnail(s)
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Rainbow 0.8.50 Beta Released (bugfix / usability)
Posted by: Nils Schmidt - Yesterday, 8:46 - Forum: Parts Author Tools - Replies (3)


this release took a little bit longer than expected, but it includes now 6 bug fixes. And three minor usability enhancements.
Some of the issues were indirectly reported by Gerald and Willy. They provided their log files and I was able to spot some critical entries.
Thank you both!

[Image: imgDuke2.png]
As always, you can download LDPE from this page:

(3 new features and 6 bug fixes)

With this release you will be able to...

  • ...use a button to re-open the 3D view (if no view is shown)
  • ...see a warning if you try to configure a shortcut key which can't be assigned.
  • ...start the program with a broken config file (it's not a bug, it's a feature...).

The following critical issues were fixed:

  1. The program could break if a subfile refered to a non-existent or read-protected nested subfile in very rare cases.
  2. There was a critical selection problem which occured if you have tried to select a single quad, but you deactivated the selection of quads before (selection filter).
  3. It was problematic if the program could not read from the official and unoffical LDraw library folder.
  4. It was impossible to save a file if its directory does not exist anymore.
  5. There was a breaking bug which could deactivate the duplication check on a single file (did not affect other files).
  6. Pressing the ESC key reset the (scale) snapping to an unexpected 2.00 value.

The program was tested intensively with "real world" files.
However, it is still a beta version and something can go wrong in about 140.000 lines of code.

Make sure that you choose the right architecture for your OS and Java Virtual Machine (JVM) (64bit or 32bit).
A short guide how to check if a 64bit JVM is installed on your system is located at the bottom of this message.

  1. Download the zip-Archive
  2. Extract the archive content to the location of your choice
  3. On windows, double-click "run.bat" to start LDPE.
  4. On linux/mac, you have to excecute the shell script "run.sh" to start LDPE.
Please note that this software is in the beta stage. Although, this version was tested, there are already known issues  for this release. There is a potential risk of data loss.

You can search for updates if you do the following steps:

  1. On windows, double-click "update.bat" to search for updates.
  2. On linux/mac, you have to excecute the shell script "update.sh".
I listen carefully to your requests and possible complaints. Please leave me a message, with your thoughts and wishes to further improve the software.

LDPE is a 3D CAD application: The overall system requirements are higher. While I recommend to use a powerful 64-bit multicore system, it could be possible, to run LDPE on older machines as well.

System Requirements:

Minimum System Requirements:
  • 64-bit Java Runtime Environment (JRE) 1.8
  • OpenGL 2.1 compatible Graphics Card
  • Operating System (64-bit): Windows [7 or newer], Linux [e.g. Ubuntu Linux >=14.4], Mac OS X [>=10.6]
  • CPU: Multicore-Processor e.g. Intel Core 2 Duo or AMD Athlon II (>2.0Ghz)
  • RAM: 4GB
  • Video-Memory: 1 GB
  • Free Disk Space: 100 MB
Recommended Requirements:
  • Operating System (64bit): Windows 7,8,10, Linux [e.g. Ubuntu Linux >=14.4], Mac OS X [>=10.6]
  • OpenGL 3.3 compatible Graphics Card
  • CPU: Multicore-Processor with 4 cores (or more)
  • RAM: >4 GB
  • Video-Memory: >1 GB
  • Free Disk Space: 512 MB
  • For a faster start, LDPartEditor and the LDraw™ library should be installed on an SSD.
How to check your JVM version (32- or 64-bit):

You can try on the command line:

java -d64 version

If it's not a 64-bit version, you'll get a message that looks like:
This Java instance does not support a 64-bit JVM. Please install the desired version.

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  42115 Lamborghini Sian, New Body Parts
Posted by: Gerald Lasser - 2020-05-31, 22:27 - Forum: Part Requests - No Replies

Sariel has done a nice video of the new Technic Supercar, as a bonus it comes also with a lot of details for the new body parts. Seems Part 18944 is kind of a seed part concerning geometric similarities.


Out of curiosity I have applied the similarities to the triangular panel, I have attached the result, as I want to finish the Minions first.

So feel free to take them further.

at 7:23 the new curved mudguard, also borrowing the curve from 18944.

at 8:41 there is the new 19x3x1 Panel

There is also a quite extensive information on the rims starting at 6:00

Attached Files
.dat   Panel13+5_Right.dat (Size: 33.36 KB / Downloads: 0)
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  Identify Completed Part Requests
Posted by: Gerald Lasser - 2020-05-31, 22:09 - Forum: Website Suggestions/Requests/Discussion - Replies (2)

An idea for the Parts Request sub-forum:

I think we should indicate completed part requests by assigning a "Post Icon" to the first post, this is then added to the topic view and makes it easier to spot open requests.

I was looking through the available icons, but apart from the "Star" or "Thumbs Up" nothing really fits well, Orion, is it possible to add a tick mark to the selection?

Or add a simple [COMPLETED] to the Thread title?

What do you think?

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Question Installation page incomplete
Posted by: Paul Sinasohn - 2020-05-30, 22:19 - Forum: Website Suggestions/Requests/Discussion - Replies (1)


I am flummoxed. I am trying to get LDraw installed & running on a late-2013 Mac using HighSierra 10.13.6.

I have used MLCad on windows for years, but haven't bothered to do a manual LDraw update in a long time.

In reading the "Getting Started:Mac" page, I see that clicking either link in Step 1 takes me to the "Latest Parts" page, which tells me absolutely nothing about using or installing LDraw on a Mac. 

If I were a parent, or an AFOL new to this system, I would leave and never return. I would probably also tell others in my community not to bother with LDraw as it doesn't work.

Even if I could figure out that I needed to download & expand the complete.zip file, doing so leaves me with a bunch of files that I have no idea what to do with. So I am again at a point where I give up and leave.

Can someone expand Step 1 so that there are complete & USEABLE instructions for a Mac installation post-download? Perhaps Allen Smith & Willy Tschager could work on a MacOS AIOI? I would be happy to beta test the instructions or the installer.

I am a longtime member of BayLUG and the Bricks by the Bay convention staff. Most of my MOCs are dioramas (circus, farm/ranch) though I do have some larger buildings.

Thank you in advance for any and all advice. 
Stay home and stay safe. Play Well.

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  How do you select edges
Posted by: Willy Tschager - 2020-05-30, 17:23 - Forum: Parts Author Tools - Replies (2)

How do you select edges and conds. in LDPE via "Select all" making sure the edges in prims don't get selected ... 'cos "... except Subfile Content" doesn't work. And don't propose to hide the prims prior selection. I'm looking for the easy way.


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  3068bpx1 is not the right piece
Posted by: Thom Kok - 2020-05-29, 21:19 - Forum: Part Requests - Replies (5)

I checked the rebrickable site, but I don't think this is correct. I hope someone can explain whether this is a mistake or not. It should be the drill piece.


[Image: eIR99UM.png]

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  Official Library File Format Restictions
Posted by: Orion Pobursky - 2020-05-28, 21:48 - Forum: Official File Specifications/Standards - Replies (14)

As part of our meeting last year in Billund, we expressed a desired to make the learning curve for authoring parts a little less steep. As part of that, I'm working on clarifying the rules for the Official Library. Recently we've had a discussion about complete assemblies and disallowing sticker shortcuts for stickers applied to single, flat parts. As a result of those discussion, I made a draft revision to the File Format Restrictions for the Official Library. Proposed changes in red:

I also posted about my concerns about documentation fragmentation. I personally feel that the File Format Restrictions for the Official Library document should one single source for all the rules for parts in the official library. With that reasoning in mind, I think "Official Library Policy On Embedding POV-Ray Code" should be cancelled since those METAs are already disallowed. Also, the "Parts numbering scheme for parts with unknown numbers" and "Official Library Specification for Sticker Parts" should be folded into the main document. There are also some pages on the PT that can be added as well.

Basically, I'm opening the entire "File Format Restrictions for the Official Library" document up for revision. How should this document be laid out? What else should be included? I have the ability to separate sections in to tabs and other formatting tricks. I also think a downloadable PDF for quick, offline reference might be a good idea. Maybe even a Quick Reference One Sheet for commonly used info.

I'd like to have a full and frank discussion about this. Remember, if you have a problem, propose a solution. Also, we're not going to break backwards compatibility. Aside from those 2 rules almost anything goes.

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