 | | Re: Thanks to all the parts developers
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(...) thx to you kevin for makin' pov-rendering a piece of cake. toying around with all this cryptic pov-code was never easier. w. (waiting to see his space parts certified, especially the crater plate - reviewers please!) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) I don't actually do any transformations in LDView to get the logos right. I just detect the mirroring (by tracking negative determinants and flipping the mirrored bit every time I see one) and modify my texture coordinates to un-mirror (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) Yeah, I did a search for determinant and found your note. I tried the on-the-fly fix in ldglite with the L3 structs and it seems to work, although I'm not sure I'm applying the fix correctly. Is it really as simple as multiplying some matrix (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) We definitely don't want to do this. It's unnecessary, because the sign of the determinant in the matrix specifying the sub-part tells you whether the sub-part is mirrored. The above might allow the program to do less math, but that's not an (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) Yes. That's what LDView does. --Travis Cobbs (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) Umm, my math is really rusty. Can the sign of the determinant also be used to detect mirroring? That could be handy. Don (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Thanks to all the parts developers
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I just wanted to say thanks to Steve, Chris and all else that are involved with the developent, review and approval of the parts in the parts library. Programs can come and go, but without the parts library we'd have nothing. I think that the parts (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) Wait a minute. Doesn't L3Input.cpp build a threaded tree structure before outputting a single POV part? I would think you could traverse the array Parts[0...nParts] and look for toplevel parts from the PARTS directory. Then for each toplevel (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) My view is that there is nothing _serious_ wrong, but that a fix should be welcome. Anyway. Since we are only talking about studs, the rendering programs _could_ simply remember to fix any mirrored studs (can be done by multiplying the (...) (21 years ago, 1-Jul-03, to lugnet.cad.dev)
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| | Re: Mirrored parts and studs
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(...) My only concern about letting the rendering programs do this is "how they know which way to orientate the logo". Coding this within the .dat file (either with a correctly orientated stud.dat or with metadata) is preferable to storing this (...) (21 years ago, 2-Jul-03, to lugnet.cad.dev)
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