 | | LDDP Coplaner Checks
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Now that the coplaner quad is defined in the LDraw spec by planer normals, the dist and det checks used by LDDP (and L3P) are now outdated. I think these checks should be removed, are there any users out there that would like to see them stay? (...) (15 years ago, 16-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(...) --snip-- (...) You are right here. In 3D it gets a bit more complicated and, as far as I know, a mirror and rotation corresponds to a mirroring on a plane and a rotation within that plane. I'm sure there is a way to unravel it all but it's (...) (15 years ago, 16-Jun-09, to lugnet.cad)
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| | LD4DStudio 1.1 Beta 1 Available
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I finally completed LD4DStudio 1.1 Beta 1, You will find it on (URL) version introduces a whole boatload of changes and additions, see the release notes section for a complete overview. (URL) also updated the manual and added some technical (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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Hi Kevin, Here's the problem. A mirror plus a rotation can look just like a mirror across another axis. Ugly 2D ASCII art example: .|b --- .|. Mirror the b to the left. d|. --- .|. Rotate 180 degrees. .|. --- .|p That looks just like you mirrored (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(...) Hi Tim, Thanks. Math is not my specialty, so all help is appreciated. If the user has rotated the mirrored submodel, doesn't the vector normal then also get rotated? The hope was there was a way to separate the mirrored aspect of the rotation (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(...) You can also use SR 3D Builder to build your mirrored/symmetric models. You build a side and the program will build the other, mirrored one. It automatically substitute and rotate non symmetric parts and is compatible with lDraw/MLCad file (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(...) Not sure if this helps but... If you solve (M11+1) x + M12 y = - M13 M21 x + (M22+1) y = - M23 and then normalise the vector (x,y,1) the result will be a vector normal to the mirroring plane. To test that you indeed have a rotation/mirror you (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: LPub Bad results with LDView
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(...) Way back in olden times we created some programs to automate the mirroring process. (URL) anyone feel like testing the programs out to see how well they hold up with all the new parts available today? Don (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(This should probably have been in lugnet.cad.dev, and I almost put it there, but decided that it wouldn't make much difference.) I don't know the answer to this question. I'm responding any, just to let you know that I did read the question, since (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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| | Re: Mirror matrix question
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(...) I don't think so. (...) What if you mirror it again to get back to an unmirrored state, then run the code in mirwiz to create a submodel that only looks mirrored (but actually just flips pieces to look mirrored and substitutes opposite wedges, (...) (15 years ago, 15-Jun-09, to lugnet.cad)
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