Subject:
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Re: Primitives and quads/triangles
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 17 Oct 2002 10:51:32 GMT
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Viewed:
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456 times
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In lugnet.cad, Lars C. Hassing writes:
> "Niels Karsdorp" wrote...
> > Which technique shall I use on my wheels?
>
> I will strongly recommend to use primitives whenever possible.
> Note that L3P v1.3 only supports the 1-4conN.dat primitives,
> not the 4-4conN.dat. I'll add this to the next version...
> So, until then use 4 1-4conN.dat primitives to see the effect in POV.
>
> Type "l3p -pp" to see a list of currently supported primitives.
>
> BTW, has the unfortunate 4-4con12.dat been deleted officially?
> The 4-4con1.dat says:
> 0 19990819 SEB Renamed 4-4con12.dat to 4-4con1.dat
> Should I delete my 4-4con12.dat?
>
> Combining three or more cones to achieve the right cone may look good in POV
> but doesn't it create unnecessarily many triangles in other renderers?
> The same goes for combining multiple rings.
>
> A solution could be something similar to the tori primitives:
> cnIIIOOO.dat
> where III is inner radius and OOO the outer, e.g. cn016019.dat
> And rnIIIOOO.dat for rings.
> For quarter cones and rings, well, can we sneak in a '4' somewhere?
> It will result in more primitives, but renderers can benefit from fewer
> (and larger) triangles.
Sounds great, the wheels have several unusual sized rings
(inner radius 8, outer radius 22 or 28)
(inner radius 19, outer radius 22)
No I have to use two or three rings,
or use quads and POV ring:
0 L3P IFNOTPOV
ldraw quads (and optional lines for cones)
0 L3P ELSEPOV
0 pov disc (or cone)
0 L3P ENDPOV
A suggestion for quarter cones and rings, replace the n in above
names with 4? r4IIIOOO cq c4IIIOOO ??
> > (I also planned to create more wheels:
> > * old train locomotive wheel with spokes
> > (same as the one above, but a more cone shape,
> > used to prevent the anti-slip tyres from falling off)
>
> I have some very old (1966) train wheels with four studs and with grooves
> (matching the tracks), http://guide.lugnet.com/set/117
> The locomotive version is conical and smooth and supposed to hold
> an anti-slip tyre, http://guide.lugnet.com/set/112_2
It seems that I have the locomotive version then, smooth and conical.
/Niels
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Message is in Reply To:
 | | Re: Primitives and quads/triangles
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| "Niels Karsdorp" wrote... (...) I will strongly recommend to use primitives whenever possible. Note that L3P v1.3 only supports the 1-4conN.dat primitives, not the 4-4conN.dat. I'll add this to the next version... So, until then use 4 1-4conN.dat (...) (22 years ago, 17-Oct-02, to lugnet.cad)
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