 | | Its starting to happen...
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Hi there, im first time writer, long time reader, Baz. I stayed quiet when Lego made the 'new' brown and grays. You all said what i was thinking. But. The other day I received a Lego part that was on Bricklink as Brown. Its reddish brown. So it (...) (19 years ago, 8-Apr-07, to lugnet.color)
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| | Re: Inverse matrix?
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The latest: (URL) (19 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | The Bastion of Garda Tur
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Hey All, This was my main MOC for Brickfest. Gallery: (URL) you like it, comment and criticisms are always welcome. Josh (19 years ago, 8-Apr-07, to lugnet.castle, lugnet.announce.moc) !
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| | Re: NXT BrickSorter - Sorting bricks with a HiTechnic colour sensor.
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(...) Thx for the comments. The design as it stands right now would not allow the sorter unit to rotate all the way around - not a bad idea though. I wanted to challenge myself with the angle idea on the sorter itself (2 rows of cups). With larger (...) (19 years ago, 8-Apr-07, to lugnet.robotics.nxt, FTX)
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| | Re: Inverse matrix?
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(...) Well I'll be! That works too! Thanks you guys! James (19 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix? [DAT]
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(...) Did you mean this: [ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ] [ 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16 ] I have yet to try it. James (19 years ago, 8-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix?
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(...) I learned my matrix math from a 3d game programming book and I have no idea what the diagonals are... I was going to look it up but I got Travis' code to work! (URL) might still look it up as I may need to know about it) James (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix?
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(...) I mean swap the OFF-diagonals, leave the diagonals as is. (...) (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: how does a line ends?
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(...) Interesting. I looked at the C runtime library sources that came with MSVC++ 6.0. The fgets() function there is definitely a little different than either yours or the one ROSCO linked. It does have a couple calls for thread safety, but (...) (19 years ago, 7-Apr-07, to lugnet.cad, FTX)
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| | Re: Inverse matrix?
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(...) Just take the transpose of the 3x3 world rotation matrix and it should work as the inverse. Transpose means swap diagonals M[1,2] <=> M[2,1] etc. If this doesn't work I've misunderstood you. Tim (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix?
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(...) Hehehe, cool, I'll try that. Thanks! James (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix?
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Clarification! .... snip (...) I am using additional points to specify the location of feet. Combined with the model location, I have 3 points for the hip and feet. [now the following paragraph should make more sense] (...) (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: Inverse matrix?
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(...) Arg. I thought this was going to be easy. I liked this part of the wikipedia article: "In practice, inverting a matrix is rarely required. Most of the time, one is really after the solution of a particular system of linear equations." Hm. I (...) (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Brisbane kangaroo sculpture
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(URL) Those of you that have been to Brisbane will probably know the ones I mean. It's a bit big but I figured it was a worthy compromise of size and accuracy. Tim PS. Yes the camera is pointed where I want it pointed. (19 years ago, 7-Apr-07, to lugnet.loc.au, FTX) !
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| | Re: how does a line ends?
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(...) Thanks, ROSCO. I took that code and modified it to use char instead of _TCHAR, and got timings of 720-750ms, compared to the 750-780ms I got with my original one. I then modified it to support CR and LF interchangeably, and got back to the (...) (19 years ago, 7-Apr-07, to lugnet.cad, FTX)
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| | LDD Model of GG-1 Electric Locomotive - Advice Requested
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I decided to model the very well known GG1 locomotive as a model available from LEGO Factory. I took some liberties with the design and color scheme in order to accomodate what can be done in LDD. Even so, I think the result is inherently (...) (19 years ago, 7-Apr-07, to lugnet.trains, lugnet.announce.moc, lugnet.cad.ldd, FTX) !
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| | Re: Inverse matrix?
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(...) I just realised something... do you want a general inverse or a specific inverse? Some inversions are simple eg. a pure rotation can be inverted by taking its transpose and reflections are their own inverses. Tim (19 years ago, 7-Apr-07, to lugnet.cad.ray, lugnet.cad)
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| | Re: how does a line ends?
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(...) Just as a proof of the value of disk caching, loading the same model using the system fgets after a fresh reboot, the same loading portion took 3300ms. Also, I switched the feof calls out for a check of the value against EOF just to see if it (...) (19 years ago, 7-Apr-07, to lugnet.cad, FTX)
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| | Re: how does a line ends?
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(...) (URL) Google to the rescue>. ROSCO (19 years ago, 7-Apr-07, to lugnet.cad, FTX)
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| | Re: how does a line ends?
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(...) Quick question. I was in a hurry, and wanted to play it safe, so I call feof instead of checking to see if char1 == EOF. Any idea what gets returned for extended ASCII characters (>= 128)? Does the int contain positive numbers greater than (...) (19 years ago, 7-Apr-07, to lugnet.cad, FTX)
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