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(...) There is, however, such a thing as an impractical problem ;) ROSCO (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Well actually what txt2dat does is a slightly different problem - it has a few simple closed loops and has to triangulate the complex polygons bounded by them (it uses the excellent (URL) triangle library> to do that). Renderers on the other (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) OK, I stand corrected. Technically a program can fix things a load time. However, you might be surprised at how long it takes. It's "only" O(n^2), but each iteration is slow. You have to search the current line segment against all other line (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Well... Technically it is true. The rendering program ought to be able to scan all the points in each part and look for intersections with every edge in the part. Then break up the offensive T-joins automagically and render it perfectly. (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Arguably it's probably the algorithms and/or numerical proccessing that are at fault. Certainly when you design scientific code algorithms they should usually be created in such a way that it minimises numerical error. Of course I don't expect (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) I'd really appreciate it if you didn't blame it on the rendering programs. There's really nothing that they can do to fix the problem. I can understand why you might feel that they are at fault, but it really isn't true. As such, you might (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) I try to minimise file size whenever possible myself and have nothing against T juctions. While the gaps can be annoying I feel that they are a fault of the rendering program rather than the parts. (18 years ago, 4-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Introducing RACHAL - the Raytracing Challenge
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Well I submitted my entry: (URL) It was pretty fun, and I got to teach myself a few more POV tricks (like loops mainly). Nothing was changed in the MPD and I used L3PAO to convert to POVRAY and then I used Mesh-Enhancer on the minifig's hair to (...) (18 years ago, 6-Mar-07, to lugnet.cad.dev.org.ldraw)
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| | Re: Naming of Parts (esp. Wheels & Tires)
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El-Lutzo schrieb: (...) I am also often confused by the naming. For that I have started to have my own translation table for which wheel fits to which tyre. The problem at this point is, that there are many official parts out and I think it might (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts)
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| | Re: Request for votes in LDraw polls
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(...) jeroen, you've got mail. bye, w. (18 years ago, 5-Mar-07, to lugnet.cad.dev.org.ldraw)
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| | Re: Request for votes in LDraw polls
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(...) Hi Timothy, I would love to vote but I lost/forgot my login-name. I tried to recover but I don't get reply-mails with a new password and contacting you via the webmas...etc address only gives my an 'hey don't send spam to peeron'-message: Hi. (...) (18 years ago, 5-Mar-07, to lugnet.cad.dev.org.ldraw)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Sounds reasonable to me. Any chance a T-junctions FAQ could be created on the parts tracker reference page, and the above could make it into a policy statement in the parts review FAQ? Most of my original post here could be used as the FAQ, (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) T-junctions are a quality issue in part files. I don't think they should be strictly forbidden (that is, having T-junctions is not a reason to hold a part file from official release). Generally, I wouldn't even say that a part with T-junctions (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Heh, I think I found the (URL) ASCII art>. I coulda sworn it made it into a FAQ somewhere though. Oh well. Have fun, Don (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Need (working) program to generate instruction pictures
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(...) cockpit is drawn with a stipple function that's buggy in many ATI drivers. And the ledit text (toolbar?) is still drawn in the front buffer. The latest source code in CVS is patched for the toolbar problem on some radeon cards because it was (...) (18 years ago, 5-Mar-07, to lugnet.cad.dev.mac)
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| | Re: Part Authors: opinions sought on T-Junctions
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--snip-- (...) Just to be clear it's not the render time I'm worried about... it's the authoring time. Tim (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) Much as I'd like to agree on this, I don't think the fact that nobody posted back then disagreeing with my statement really counts as consensus. I pointed out the problem, but didn't ask for opinions on whether parts should be modeled that (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) There are T-junctions there, but the ones that produce the most visible dots are between the white stripe and the moon. Both of those colors are light, so the dark background showing through is much higher contrast, which makes the dots much (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Part Authors: opinions sought on T-Junctions
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(...) It's not really constrained to high zoom. If you have a 1% chance of any given pixel along any given T-junction boundary edge resulting in a hole, then you'll have the roughly the same number of holes at any zoom level, since in general the (...) (18 years ago, 5-Mar-07, to lugnet.cad.dat.parts, FTX)
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| | Re: Need (working) program to generate instruction pictures
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(...) Good call. I ran it with -n4, and that makes things visible during rotation. The status bar and final appearance of the model (after you stop rotating, if your rotation style is different) don't get drawn until obscured by a menu, etc., so (...) (18 years ago, 4-Mar-07, to lugnet.cad.dev.mac)
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