 | | Re: Restart of LDA2001 Project (using LDraw models - L3P - POV)
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(...) That is what I was going to do too. (...) I guess what I was thinking was exporting a file that could either be povray format, a format that l3p could convert (preserving unions, macros, etc), or a format that I would use with Anton's library (...) (20 years ago, 14-Jan-05, to lugnet.cad.ray, lugnet.animation, lugnet.cad.dev)
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| | Re: Restart of LDA2001 Project (using LDraw models - L3P - POV)
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(...) Thanks for the response. Just a qiuck reply, got to go back to work... LDA outputs both .dat files for the indiviual frames but also one master .dat that has references to the single-frame files, separated by CLEAR and STEP. L3P supports (...) (20 years ago, 13-Jan-05, to lugnet.cad.ray, lugnet.animation, lugnet.cad.dev)
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| | Re: Restart of LDA2001 Project (using LDraw models - L3P - POV)
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(...) Tore, I think I know what you could do that would meet even my needs. Here is my idea. Output one pov-ray file. Have it export valid pov-ray format using unions, macros, clocks, switches, ranges, etc. Then, with that, it will be easy to add (...) (20 years ago, 13-Jan-05, to lugnet.cad.ray, lugnet.animation, lugnet.cad.dev)
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| | LDraw.org Contributer Agreement Affirmation
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Hi all, Thanks for all the words of support regarding the LDraw.org Contributer Agreement. We've received quite a few responses but would like to wrap up this issue as quickly as possible. For those who haven't heard of the CA here's the (...) (20 years ago, 12-Jan-05, to lugnet.cad, lugnet.cad.dev, lugnet.cad.dev.org.ldraw)
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| | Re: Change to existing policy regarding the subfiling of dithered colors
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(...) many, many thx to the LSC for getting the job done so quickly :-)))) w. (URL) (20 years ago, 9-Jan-05, to lugnet.cad.dev)
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| | Re: Very small triangle and a quad that thinks its a tri
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(...) I'll send you the whole file (its not complete yet), but the values for the tri are A (0.989107, -1, 0) B (0.997785, -0.98677, 0.06652) C (0.997785, -1, 0.06652) William (20 years ago, 8-Jan-05, to lugnet.cad.dev)
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| | RE: *** SPAM *** Re: Very small triangle and a quad that thinks its a tri
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(...) Only at 5dp (ie -det/-dist of 0.00001), but then as the values are only to 5dp this is not surprising! The co-linear vertices are reported for any -det/dist values from 1 to 0.00001 William (20 years ago, 8-Jan-05, to lugnet.cad.dev)
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| | Re: Very small triangle and a quad that thinks its a tri
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(...) I think so too. William, could you please e-mail me the actual coordinates of A, B, etc., and perhaps the whole file. (...) Good question! (...) The colinearity test currently has a hardcoded threshold of 0.01. The colinearity test is carried (...) (20 years ago, 8-Jan-05, to lugnet.cad.dev)
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| | Re: Very small triangle and a quad that thinks its a tri
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(...) I'm guessing this is a limitation of the accuracy of the l3p -check, so probably ignorable. Does the -dist option affect this test too, or just the coplanar quad test? Maybe there could be another option in l3p to adjust the accuracy of the (...) (20 years ago, 8-Jan-05, to lugnet.cad.dev)
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| | Very small triangle and a quad that thinks its a tri
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Whilst working out the non-right-angled cylinder intersection sub-parts for the Boat Rigging pieces I have run into two related problems 1) I have a triangle A-B-C that is so tiny that L3P reports it as co-linear and L3Lab doesn't render it (it (...) (20 years ago, 7-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) Hi Lars. Hey, I've got an idea. Stop adding new features (for a little while) and just release it. ;^) Pretty please with extra sugar? (...) Nifty solution, but what if someone looks down the hose and sees it's all blocked up with spheres so (...) (20 years ago, 7-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) (snip) (...) I'll add 4-4cyls.dat, so that shouldn't hold you back. Also, in the coming version you can add primitives yourself. (...) Another way to achieve no overlap is the method I used in 30093.dat "Plant See Grass": I simply placed (...) (20 years ago, 7-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) OK, here's my VERY LAST word on the subject: Transforming both 4-4cyls S0-S1 and vector S1-S2: Rotate about Y by beta until S0-S1 lies in the YZ plane Rotate about X by gamma until S0-S1 coincides with +Z Rotate about Z by delta until S1-S2 (...) (20 years ago, 7-Jan-05, to lugnet.cad.dev, FTX)
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| | Re: Mathematical assistance please
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(...) Ooooops, I see now I was totally barking up the wrong tree, you need to WORK OUT the alpha angle, sorry. But transforming the co-ordinate system should still work. ROSCO (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) Or maybe another way to look at it (got this from old lecture notes): Goal: rotate about arbitrary vector A by alpha Idea: we know how to rotate about X,Y,Z So, rotate about Y by beta until A lies in the YZ plane Then rotate about X by gamma (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) Could you transform the co-ordinate system so that one of it's axes is along the centre-line of the 4-4cyls (in the plane S0-S1-S2), rotate it about that axis so that the longest sise is in the plane, then transform the co-ord system back? (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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In lugnet.cad.dev, Ross Crawford wrote: <snip> (...) know how to come up with the rotation angle needed to twist the 4-4cyls.dat into the right position. One reason to push forward on my original solution is because the same knowledge can be used to (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) Hi Roscoe, Thanks for the help. If you extend the cylinders so that the outside edges touch, you will be able to see the overlap.... at small angles, this works because the overlap is small, but at larger angles, the overlap is noticable. I (...) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) It's hard work, but this page might help (URL) (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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| | Re: Mathematical assistance please
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(...) Hi Philo, Good to hear from you. My mistake.... I am using 4-4cyls.dat. rotating them to align them with the S0-S1-S2 plane is what I don't know how to do. Thanks, Kevin (20 years ago, 6-Jan-05, to lugnet.cad.dev)
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