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Subject:	Re: Non-BFC primitives (was: Primitives with different BFC winding)
Newsgroups:	lugnet.cad
Date:	Fri, 2 May 2003 19:16:27 GMT
Viewed:	614 times

Oops forgot to get the primitives from Ldraw027.exe. Please forget my previous post and read this one ;-) In lugnet.cad, Steve Bliss writes: > In lugnet.cad, Niels Karsdorp wrote: > > Making my parts BFC compliant I noticed that several > > primitives of the same class have different BFC winding. > > Compare 2-4ring1.dat and 2-4ring2.dat > > But more primitives are involved, mostly rings > > and ring segments. > > Different winding should not be a big deal. > The BFC standard requires renders to > keep track of the winding direction and cull correctly. I just found out what caused my notice. I had several non-bfc'd primitives overwritten with unofficial bfc'd versions. Now I have deleted all files from my P-folder and extracted all primitives from ldraw027.exe and the current complete.zip (inlcuding update 0301). Now I end op with 30 non-bfc'd primitives: (leaving edge primitives out of the count) 1-4ccyli 1-4con1 1-4con2 1-4con3 1-4rin10 1-4ring3 1-4ring4 2-4ring1 2-4ring4 2-8sphe 3-8cyls 4-4con1 4-8sphe arm1 arm2 bushloc2 bushloc3 bushloc4 bushlock box3#8p box4t clip3 clip4 connect5 h1 h2 steerend stud3a stu26a tri3 How can I make my parts bfc certified if it uses any of these primitives ? I don't know if anyone has made these parts correct bfc certified, since the PT is offline for a while. Are the next 'rules' for making primitives bfc certified correct ? * rect/disc/ndis/ring: top = frontface * cyli/cyls/cyls2: outside = frontface * cone: outside/bottom = frontface * other: outside = frontface with frontface i mean the faces that are drawn when back face culling is activated (or shown in green with L3Lab's MyTest6 applied) when the primitive is used as follows: 1 color 1 0 0 0 1 0 0 0 1 primitive.dat Niels

Message has 1 Reply:

		Re: Non-BFC primitives (was: Primitives with different BFC winding)
(...) (don't use box3#8p - use box3u8p) (...) The only thing your part files have to deal with is whether the primitive files are being used in their default orientation, or do they need to be inverted (turned inside-out). (...) Yes, those all look (...) (22 years ago, 10-May-03, to lugnet.cad)

Message is in Reply To:

		Non-BFC primitives (was: Primitives with different BFC winding)
(...) I just found out what caused my notice. I had several non-bfc'd primitives overwritten with unofficial bfc'd versions. Now I have deleted all files from my P-folder and extracted all primitives from the current complete.zip (inlcuding update (...) (22 years ago, 2-May-03, to lugnet.cad)

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