 | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | John VanZwieten wrote in message ... (...) primitive (...) the (...) ray (...) A hypothetical batch dat fixer program could examine the primitives first and flag the ones that were not closed volumes, since those would be the only ones that would (...) (25 years ago, 30-Sep-99, to lugnet.cad.dev)
| | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Steve Bliss
| | | | | (...) It wouldn't matter if they were closed-volume or not--they could still be turned inside out accidently. And an inside-out closed-volume primitive wouldn't do anybody any good. (...) Why? Steve (25 years ago, 1-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | Steve Bliss wrote in message <37f4ab7d.64002272@l...et.com>... (...) Doh'! You're right. (...) I'm having a difficult time picturing in my mind how an asymmetrical part can have its orientation matrix in the parent dat file mirrored and rotated (to (...) (25 years ago, 1-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | | Gary Williams wrote in message ... (...) *a lightbulb appears above my head* Nevermind, I understand now. For some reason I was imagining inverting all three axes, but now I realize only two would need to be inverted, before the part is rotated 180 (...) (25 years ago, 1-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Steve Bliss
| | | | | (...) OIC now. I think. If an asymmetrical part is mirrored, it keeps the same shape, but is turned inside out. To get it right-side-out again, it must be re-mirrored. In other words, there's no way to produce left- and right-handed pairs of (...) (25 years ago, 3-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | Steve Bliss wrote in message <37f4edd7.8510607@lu...et.com>... (...) are (...) rotated (...) thinking. (...) Possibly. I'm not to great when it comes to expressing myself. I think if an even number of mirror operations are performed on a part, its (...) (25 years ago, 3-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Bram Lambrecht
| | | | | (...) I mirror sub-parts often in my models (for hoses, wings, etc.). Would this require an INVERT? --Bram Bram Lambrecht / o o \ BramL@juno.com ---...---oooo-----(_...o---...--- WWW: (URL) (25 years ago, 3-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | Bram Lambrecht wrote in message <19991003.083644.509...no.com>... (...) No. Our software will detect mirror operations and correct for them. -Gary (25 years ago, 3-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Steve Bliss
| | | | | (...) I've been thinking the exact opposite -- mirroring should be a valid method for turning subfiles inside-out, and the software doesn't need to do anything special to deal with it (except to notice the inversion, and pass that info on to the (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | Steve Bliss wrote in message <37f8c86b.239282689@...et.com>... (...) But more often than not, when mirroring an element or subassembly, it's not the intent of the author to turn it inside out. Typical model builders shouldn't concern themselves (...) (25 years ago, 4-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Steve Bliss
| | | | | | (...) True. But mirroring is an advanced technique. Well, maybe intermediate-level. Anyway, it's not for beginners. (...) True. Allowing mirroring/inversion for parts authors allows them to use a single set of primitives, while keeping part-files (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Gary Williams
| | | | | | | Steve Bliss wrote in message <37f9f5c6.74291430@l...et.com>... (...) not (...) inversion. (...) For WizardCAD I was intending to change the behavior of the mirror functions depending on what type of file the user opened the file as. If they open a (...) (25 years ago, 5-Oct-99, to lugnet.cad.dev)
| | | | | | | | | | | | | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB) —Lars C. Hassing
| | | | | Gary Williams wrote in message ... (...) I agree with Gary that mirroring should not turn subfiles inside-out. The rendering program should correct (C)CW-ness by looking at the transformation. Part authors should use the INVERT for explicitly (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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