 | | 71184 Bar 4.5L Straight is too short
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Hi, I just noticed that the part "71184 Bar 4.5L Straight" is too short. According to my findings, it should have been approx 8 LDU longer. Fredrik (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Are anybody working on the Star Wars Battle Droid arms?
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(...) cad modeller and then converted by stl2dat ! wasn't it ? I would like to recommend you and every body else which will use this type of lego part building (CAD -> convert program(ex:stl2dat)), to be very carefull with the tesselation (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) When do you actually stop, when you find the correct orientation ? or after a few fixed iterations ? Eventually you could end up with an infinite loop if you are not carefull. That method does NOT really garantees any correct results due to (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) Da, you are correct. I'd go with the (14,0) shoulder position -- it has better (hidden) precision. 14.345 is derived, as you pointed out, and it is rounded. Does LGEO have the minifig torso? It'd be so nice to have truly rounded edges and (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) Ok, thanks. I understand. It's not interesting for me (in this setting) to know the angles and offsets of the _true_ minifig. What is of interest is the values that were used to _model_ the minifig. This is because what I want to do is to pose (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Are anybody working on the Star Wars Battle Droid arms?
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(...) minifig scale battle droids from the LEGO System Star Wars theme. Of course, I am also very happy to see that you are working on the larger version you showed me above. Great work! Fredrik (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) When it finds that any face of a primitive needs to be inverted. We would have to fix the current primitives so that all faces are pointing to the same direction. Take a look at the sphere primitive for example, it has faces pointing inside (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) I can't speak for the other programs but if you allow a part to have CCW and CW faces in any OpenGL program, it's going to be slower (but as LeoCAD's library is pre-processed than it won't be a problem). If you have some parts BFC compliant (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) That would be the fastest option for rendering. (...) If anyone wants to take a look and help, I can send the source to what I have done so far (it needs VC++ 5.0). I have started working and I won't have much time to improve it. (...) I still (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) I agree that an automatic process might not always work 100% but it can make parts almost perfect and with only a small effort you'll be able to completely fix them. (...) I think I'm using what you call odd/even, I cast a ray from the center (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) If you use a 3D card then the speed increase from BFC becomes negligible, I've tried to activate BFC on LeoCAD and it didn't show a big difference with the current library. Keep in mind that the current cards (except the newer GeForce) have a (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Are anybody working on the Star Wars Battle Droid arms?
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(...) Have a look here (URL) Klein A Mindstorms fan. (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | stl2dat converter now read binary stl
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Good news for Autocad part developers ! My stl2dat converter now reads binary stl files. It recognises binary files automatically. I also introduced a new option to set the origin, because some cad-cam programs can only produce stl files where all (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) No, the part is authored with an angle of 9.782. The (x,y) values of the lower facet of the shoulder is (14.345,2) and that at the waist is (19,29) - hence 4.655/27. Or alternatively the top of the torso is (14,0), giving 5/29 - the same (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Are anybody working on the Star Wars Battle Droid arms?
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Are anybody currently working on the Star Wars Battle Droid arms? I would like to use these in a model, and would be quite happy with some simple mock ups. Thanks! Fredrik (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) Thanks. Can I safely assume that the author used 10 degrees when modeling the part? BTW: This is just what I find unuserfriendly about the parts library: You had to reverse engineer the part to find the angle. I'm sure the information I asked (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) the (...) therefor (...) I would suggest to make the meta-commands for the renderer as simple as possible and move all other corrections to external programs or functions. I believe that what we have of BFC in MLCad for example is good enough (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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OK. I've thought about most of John's posting, and I think I'm ready to make an intelligible response. Just to be sure I caught everything, here's a (hopefully quick) re-iteration. The major differences between John's proposal and the proposal I (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) What would you suggest simplifying or removing? (...) How do you mean? What is a 'bad definition' in a matrix? Having a negative determinant? And what do you have to do to correct it? My understanding was that the rendering program could (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) That's not always possible, as has been discussed. And is still being discussed... (...) Yeah, that's a possibility. (...) OK, but that's a complication for the rendering engine. It would have to check the actual path of each file, after the (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) Good point. We definitely *should* muddy this discussion up with some real facts. ;) (...) Yes and no. Something that's easy to do is definitely less of a 'requirement' than something that's a lot of work. But it's still a requirement, placed (...) (25 years ago, 6-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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Steve Bliss <blisses@worldnet.att.net> wrote in message news:4qbnescr7hii5bq...4ax.com... (...) I hope it doesn't cause indigestion :-) -John Van (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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Steve Bliss <blisses@worldnet.att.net> wrote in message news:v96neskqugbi18b...4ax.com... (...) use to (...) object (it (...) faces (...) choose (...) in some (...) required to (...) the (...) You make a very good point here, Steve (especially (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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I need to digest this. I'll respond tomorrow. Steve (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Performance Improvement
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Rui, I think that it's better to keep the 4-4disc and 2-4disc files the way they are. The current configuration is more flexible, requires fewer special-size primitives, and is less likely to be mis-applied. The new proposal would only provide a (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Sphere Primitive
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(...) You'd have to ask James these questions. Only he would know. It *looks* like the non-planar quads could be a rounding error, or rounding limitation, since he used just 2 decimal places. Steve (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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Chuck Sommerville <chucks@he.net> wrote in message news:FsK824.2vK@lugnet.com... (...) I was talking about rendering engines like LDLite, MLCad, L3Lab, etc. You are correct that BFC won't help ray tracing. The big thing that would help ray tracing (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) In other words, every face in a subfile will have other faces in the part-construction that will form the other side of the solid, right? That sounds correct. (...) There are only a couple of non-symmetrical primitives, but they are used (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) BFC wont help ray tracers. Just because a surface isn't visible from the _current_ camera position, doesn't mean it doesnt cast a shadow or a reflection. Ray tracers need those backsides. -Chuck (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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koen <koen.jordens@studen...ven.ac.be> wrote in message news:FsK5CI.BxG@lugnet.com... (...) time, (...) "Fast" is a relative term. For very large models, Datsville for example, it takes long enough to render that even a 30% increase in speed makes (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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I've got a little question. Why are you working so hard on BFC. The rendering in Ldraw, L3lab, MLcad,.... is already very fast. Is the speed improvement gained with BFC supposed to provide the extra time, so you can turn an model in realtime, with a (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) The angle of the side of the minifig torso as Ldrawn is 9.782 degrees (arctan 4.655/27) from the vertical. Hope this helps. Chris (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | The geometry of minifigs
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At what angle and point do the arm/shoulder of the minifig connect to the torso? What is the angle and offset of the bend of the minifig arm and what is the angle of the hand with respect to the pin which connects it to the arm? I don't see how (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) This points out that ray traced renderings of the transparent version of these pieces will not render the refraction correctly. In the best of all worlds, the interior surface would be removed. For ray tracing, the model could be replaced with (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Sphere Primitive
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(...) I suspected this problem when I reviewed the precision of all the circular primitives, which is why I left them alone at that time. But... I never went back to check thoroughly! Chris (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) That's is the (Odd/Even) test, also with Raycasting, but no supersampling, in the supersampling case, you just subdivide the polys further and further, or shoot pseudo-random rays until you find the correct normals for all faces. this does NOT (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) Perhaps this approach is a bit naive, but couldn't you use something similar to a point in polygon test? Cast a ray along the normal from the center of each polygon. If it intersects an odd number of surfaces then the normal points toward the (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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Leonardo Zide <leonardo@centroin.com.br> wrote in message news:38EB3EB8.D81D2C....com.br... (...) here, (...) Hey, this idea might work in conjuction with your program that fixes parts. If we had a parallel directory (/pi/?) with a copy of each (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) If you assume (which is correct for lego parts) that every *.dat file you use to define a part, belongs to a whole object (the part) which is a solid object (it should be) then you can say that any of those subfiles can have their faces (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) it. (...) the (...) not (...) checking (...) which (...) (Lines, (...) OK, Slowly ... A model-file always is BFC complient until it gets included and you don't know anything about it. But the root model can do what it likes, it will effect (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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