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 | | Re: Quick way to mirror-image a model?
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| (...) IMO there *is* value to knowing that the proper exception matrix is indeed an exception rather than coincidentally the same as the default matrix. If the 5 is not the place for this, there should be a new flag for it. It's especially important (...) (20 years ago, 24-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Why process something as an exception when the default behavior is needed? It's all in what one sees as extra, unneeded code. ;-) Though I just did some timing and I don't see any performance differences between ignoring them and not. (...) (...) (20 years ago, 24-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| What about a flag for default behavior? I've been coding to ignore ones with default rotations, but there are plenty of parts (especially slopes) that need a (-1 0 0 0 1 0 0 0 1) rotation applied when reflected front-to-back and it would be nice to (...) (20 years ago, 24-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) It's neither commutative [(a * b) * c != a * (b * c)] nor associative [a * b != b * a]. That shouldn't be the problem in the calculation above, since the current matrix was the identity matrix... (...) Looks like you're doing MF = MP * (MC * (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model? [DAT]
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| (...) Can you or Don check my work? I'm trying to figure out why the ME transform that I did works in my program and the ME that Don put in mirror.ini works in his code, but not vice-versa. The most likely explanation is that I'm doing something (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) It would need to determine the plane of reflection, and do the second reflection on the X components for left-right or Z components for front-back. (...) I've come up with the same results in all cases so far. I'll do some thinking as to which (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Counter-rotary Propeller
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| This is an Idea for a counter-rotary propeller. Russian planes use this system, and helicopters too. Note: I use a rubber belt for fixing the red propeller on the gear (6542.dat) (URL) (21 years ago, 14-Feb-04, to lugnet.technic)
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marc
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Yup, oh well. I guess the mirror specification could always translate it with no rotation, or add a comment to the LDraw file saying that this part needs to be checked for proper placement. (...) Thanks! I put a 2 x 2 red brick by a 1 x 6 x 5 (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | 12cyl. radial engine ... ready
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| The engine is ready for take off. The new construction give more stability and looks good. It's like a P&W?? No adjusting necessery like the old version. Each cylinder keep his position. The radial engine can be powered with a 2838 motor and turns (...) (21 years ago, 14-Feb-04, to lugnet.technic)
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marc
(score: 0.471)
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marc
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Unreflect is a better word--just undo the X coordinate swap that -1 0 0 0 1 0 0 0 1 does. I believe they're equivalent things--I'm doing a clockwise rotation, then negating the X coordinate swap, you're doing the opposite rotation. I think (...) (20 years ago, 23-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Steve, Don--thanks for the explanations; this now makes complete sense to me (finally!). For a reflection about the plane containing the Z & Y axes (left-to-right), the reflection matrix (Mp) should be: -1 0 0 0 1 0 0 0 1 Then Mp * (part-file (...) (20 years ago, 22-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Is there any documentation about what functionality needs to be exposed to make an MLCAD plugin? I've been playing with this in a class-based architecture, that has an LMirrorExceptionList that contains an array of LMirrorExceptionPart. I've (...) (20 years ago, 21-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | Re: LegoRoy - European Tour
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| (...) Greetings Eric and everyone, I was going to do a posting on my pictures when I checked brickshelf and saw that it had 1800 hits so I figured someone must have beat me to it...thanks Eric. My wife and I fulfilled a dream by doing a six week (...) (20 years ago, 21-Jun-04, to lugnet.general, FTX)
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nelson
(score: 0.471)
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| | Re: Quick way to mirror-image a model?
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| (...) Now that I've done that, I agree with you. The true proper thing to do is to adjust the rotation matrix of all parts by -a d -g (x, y, z) * -b e -h = (-ax-by-cz, dx+ey+fz, -gx-hy-iz) -c f -i and create a list of exceptions that would be a (...) (20 years ago, 18-Jun-04, to lugnet.cad)
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nelson
(score: 0.471)
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| | LMirror 1.0
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| In response to my question earlier, about mirroring a model, I wrote a little app that I oh-so-creatively call LMirror to do a left-to-right and/or front-to-back reflection, or a top-to-bottom reordering. You can download it at: (URL) at your own (...) (20 years ago, 18-Jun-04, to lugnet.cad)
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nelson
(score: 0.470)
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nelson
(score: 0.470)
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nelson
(score: 0.470)
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| | Re: Quick way to mirror-image a model?
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| (...) Wouldn't that still be a 180 degree rotation rather than a flip, since -1 0 0 (x y z) * 0 1 0 = (-x y -z) 0 0 -1 ? Or am I laying out my rotation matrix incorrectly (is the first line a b c or a d g)? Sorry for all the stupid questions, I'm (...) (20 years ago, 18-Jun-04, to lugnet.cad)
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nelson
(score: 0.470)
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