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| Ring approximation calculation |
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Posted by: Philippe Hurbain - 2021-01-25, 18:09 - Forum: Parts Authoring
- Replies (1)
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Following review of this part, Magnus asked for my method to calculate ring approximations... as it maybe helpful for many people, I answer here...
Original pattern used a lot of thing rings to get "precise" dimensions, though this is mostly useless since measurements on prints (and prints themselves!) are pretty approximative.
Code: 1 0 0 12.25 -10 .5 0 0 0 0 .5 0 1 0 4-4rin14.dat
1 0 0 12.25 -10 .25 0 0 0 0 .25 0 1 0 4-4rin30.dat
1 4 0 12.25 -10 .125 0 0 0 0 .125 0 1 0 4-4ring62.dat
1 4 0 12.25 -10 1.125 0 0 0 0 1.125 0 1 0 4-4ring7.dat
1 4 0 12.25 -10 .25 0 0 0 0 .25 0 1 0 4-4rin36.dat
1 0 0 12.25 -10 .125 0 0 0 0 .125 0 1 0 4-4ring74.dat
1 0 0 12.25 -10 .625 0 0 0 0 .625 0 1 0 4-4rin15.dat
1 0 0 12.25 -10 .25 0 0 0 0 .25 0 1 0 4-4rin40.dat
1 16 0 12.25 -10 10.25 0 0 0 0 10.25 0 1 0 4-4ndis.dat
I propose to simplify this code with an approximation:
Code: 1 0 0 12.25 -10 .77778 0 0 0 0 .77778 0 1 0 4-4ring9.dat
1 4 0 12.25 -10 1.55556 0 0 0 0 1.55556 0 1 0 4-4ring5.dat
1 0 0 12.25 -10 1.03704 0 0 0 0 1.03704 0 1 0 4-4ring9.dat
1 16 0 12.25 -10 10.37037 0 0 0 0 10.37037 0 1 0 4-4ndis.dat
The method to get it is simple, and works well if the ring thickness is relatively low compared to its radius. I'll start from inner ring and progress to outer (here I don't want to need changes to the inner delicate pattern!), but you can do it also in the other order.- First ring: inner diameter is 7 (14/2), desired thickness is 0.75. 7/0.75=9.3333. Round to nearest integer, we get a ring9. To fit inner diameter, thickness must be 7/9=0.777777777. Close enough to the 0.75 target.
- Second ring: Inner diameter is 7.77777777 (0.777777777*(9+1)). Previous pattern outer diameter is 37*.25=9.25. Desired thickness is thus 9.25-7.77777777=1.47222222. Second ring will be obtained as int(7.77777777777/1.47222222222) -> ring5. To fit inner diameter, thickness must be 7.77777777/5=1.5555555. A bit further than the 1.47 target, but good enough...
- And third ring: needed thickness is 0.91666666, we get int(9.3333333333/0.9166666666)=10, with a thickness of 0.93333333333
Don't ask me why I proposed a ring9 for outer ring, ring10 is better!
Of course if you calculate from outside to inside, you must compensate for the "+1" between inner and outer radii of LDraw rings...
Formula is int(inner diameter / desired thickness) in the first case, int(outer diameter / desired thickness)-1 for the second.
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| Color Space |
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Posted by: Leonardo Zide - 2021-01-24, 19:57 - Forum: Official File Specifications/Standards
- No Replies
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I couldn't find this on the spec so I thought I'd ask here and maybe it could be updated to make it clear.
Are the colors listed in LDConfig.ldr in linear or sRGB color space? What about alpha?
Does the same apply to the PNGs in the TEXMAP extension?
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| i need someone to help me make this robot arm work |
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Posted by: Mcdichael - 2021-01-18, 20:23 - Forum: Help
- Replies (3)
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there's this robot arm made by Magnus Forsberg that refuses to import correctly into stud.io's part designer program correctly, whenever I import it, it says "Parts Not Found: s/62691s01.dat", and it only loads the front and the little arm connector piece, I tried fixing it myself but it's so frustrating, so i decided to give in and ask the Ldraw forums for help, also make sure to tell me if this happened to anyone else and if it happens on any other Lego building program, I want to make a cyborg army but it's not the same without the robot arm that has, like, a weapon or stud or something connected on it.
also here's the link to the part I'm having trouble with: https://www.ldraw.org/parts/official-par...rtid=62691
oh and btw, i got the version of the arm off these torsos, https://www.ldraw.org/cgi-bin/ptdetail.c.../63208.dat and https://www.ldraw.org/cgi-bin/ptdetail.c...208p01.dat, but it ended up unable to be colored, as only the stud connector could be colored, and i have no idea how to make the whole thing able to be colored in Stud.io.
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Parts 72490c01, 72490a, & 72490b |
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Posted by: Matthew - 2021-01-18, 19:39 - Forum: Part Requests
- Replies (8)
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Hello, I was just trying to build a Lego Blimp/Zeppelin for Lego Ideas in Stud.io, but sadly none of the parts for the actual envelope of the blimp/zeppelin seem to exist. I did get the gondola completed as I intended, but sadly without the actual balloon, (or envelope as it's know to those who know airships), I can't make the upload. I tried asking the folks at Bricklink to help with making the envelope, but sadly they couldn't seem to find a 3d model of said balloon. So, anybody here think they can help with that? Please? It'd be really appreciated if somebody here could, especially if you could make all three parts, the blimp container assembly (72490c01), the blimp container body (72490a), and the blimp container tail (72490b) both with and without their stickers, (especially since I plan on using a plain blimp container body with the tail fin stickers on the blimp container tail on my Lego Ideas project, so having the two ends separate and the complete assembly with and without stickers would be very helpful). So, yeah, just thought I'd ask. Rockatoa, Brickticks out!
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| 1:87 model vehicles? |
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Posted by: N. W. Perry - 2021-01-12, 0:59 - Forum: Parts Authoring
- No Replies
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This is mainly idle curiosity, since I think I can guess at the answer and the reasons behind it, but…
…has any serious thought ever been given to authoring the 1:87 model vehicles that were integral to the Town Plan system in the 50s and 60s? Or alternatively, was a conscious decision made not to do so?
Obviously these would be tricky since many of us probably don't have real-world examples on hand to work from, and they'd all be highly customized parts, not well represented by existing primitives. Also, as with many early parts, it's hard to pin down one "authentic" version of each of these, since color combinations and other details tended to vary considerably. Finally, with no connection points, they don't really function as system parts, and have no real utility within a model other than for their own sake.
On the other hand, in their day they were considered very much "in-system", as the scale of the whole Town Plan/System i leg era was built around them. And if there were ever a goal of having accurate LDraw representations of all official sets, these would be necessary to have for a fair number of those models.
Anyway, it's certainly not something I'm proposing to tackle or anything—just wondering aloud, as I say. :-)
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