 | | Re: Another matrix inverse question
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(...) Quarternions are, IMO, a bad way to do what matrices do well. For a rotation you don't need to (and shouldn't) calculate the inverse by a routine. Just transpose (swap the off-diagonals) and you have the inverse. There's no point running (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | Re: Another matrix inverse question
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Thanks for the information, everyone. Although the test case I posted was arbitrary, I did some other tests with matrices that were used for rotations and translations. The upper-left 3x3 seemed to be OK, but the bottom row had problems. I'm (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | LSynth Service
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Hi, all. I've taken the liberty of fiddling around with the LSynth 2 source code a little bit more to create an LSynth Service, a text-processing extension for Mac OS X that lets you run LSynth just about anywhere you can edit text. The service (...) (18 years ago, 10-Apr-07, to lugnet.cad.dev.mac, lugnet.cad.dev, lugnet.cad)
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| | Re: Another matrix inverse question
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(...) Hi Travis, Looking at the java version of your inversion routine I would guess that it will work for almost any 3x3 matrix + 1x3 translation (the 4x3 + 1 form). Where it will have problems is in matrices for which one or more of the (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | Re: NEW VERSION! Re: Conversion file for ldraw to ldd
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Hi Mike, Couple of ideas for a couple of the bugs. (...) Did you triy transparent and opaque? (...) Did you try 30039? (...) Tim (18 years ago, 10-Apr-07, to lugnet.cad.ldd)
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| | Re: Another matrix inverse question
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(...) Sorry about that. I wrote that code so long ago that I forgot that it wasn't a fully general-purpose matrix inversion routine. (Note that it is the way it is so that it will perform better, not because I was too lazy to do the whole shebang.) (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | Re: Another matrix inverse question
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(...) I think you've converted Travis' code properly, but just looking at the code, I'd say it's only intended to produce the inverse of the upper-left 3x3 matrix. None of the other rows or the determinant depend in any way on the 4th row, and it's (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | Another matrix inverse question
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Hello, I read James Reynolds' question about inverse matrices and the responses with interest since I similar questions about matrix inverses. I used Travis's TCVector::invertMatrix code as the base for a Java function. Other than the change to Java (...) (18 years ago, 10-Apr-07, to lugnet.cad)
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| | Re: NEW VERSION! Re: Conversion file for ldraw to ldd
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(...) I just uploaded my version 1.01e. This is what I have fixed and found as of today. I’m still working on some problem ones below and I’m at a loss on what to do if anything I could do. If you already downloaded the 1.01A through D you will have (...) (18 years ago, 10-Apr-07, to lugnet.cad.ldd)
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| | Re: POV Color Cheat! Turn Pink into Medium Blue
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(...) I thought it was, but in this case it wasn't. The color 24 line can be skipped. And the double pigment declaration was just a pure mistake; one definition is of course sufficient. :) /Tore (18 years ago, 9-Apr-07, to lugnet.cad.ray)
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