 | | 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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