Subject:
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Re: Problem with L3P
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Newsgroups:
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lugnet.cad
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Date:
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Sat, 13 Mar 1999 04:54:46 GMT
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Viewed:
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1120 times
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On Fri, 12 Mar 1999 10:16:13 GMT, "Lars C. Hassing" <lch@ccieurope.com> wrote:
> The Color7 is a "fallback" color. If no colors are defined in a model
> (which then most likely is a part) POV would use a DEFAULT black
> texture. I therefore used the grey (Color7) as LDraw does.
>
> Normally this is not a problem since a model typically specifies colors
> for all of its parts, and then it doesn't matter if the model object
> itself is colored grey. The color settings (texture/material) for each
> part overrides this. Exactly as for patterned parts, where a portion of
> the part is not colored 16, but specific colors.
>
> However, as Terry found out, it seems that there are some side effects.
> I have investigated some scenarios:
>
> First Terry's problem:
> 0 FILE test4073.dat
> 1 33 0 0 0 1 0 0 0 1 0 0 0 1 4073.dat
> which L3P translates into:
> #declare test4073_dot_dat = object {
> object { _4073_dot_dat matrix <1,0,0,0,1,0,0,0,1,0,0,0> material {
> Color33 } }
> }
> object { test4073_dot_dat material { Color7 } }
>
> As you have noticed, Color7 overrides Color33.
> And changing "object" to "union" in the declaration of test4073_dot_dat
> will solve the problem. However, you get a warning from POV: "Should
> have at least 2 objects in csg".
True. But warning or no, changing it to "union" still works. :-)
> Unless we use hard-coloring of parts (e.g. chrome antenna),
> which I generally find a bad idea.
Which is going to happen eventually. Does it make a difference if the actual
part is _not_ hard-colored? As in, the chrome colored part is a "shortcut"
that calls the original #16 colored part and colors it chrome?
Because that is how it will happen.
> So the problem will probably only arise when trying to render a
> part in another color as Terry did.
>
> There are two possible solutions to Terry's the problem:
> 1) I could use POV's #default directive in stead of Color7. However,
> the #default directive only allows texture and not material (I
> wonder why?), so this will not help Terry with his trans-blue.
>
> 2) I will add an -c<color> option to let you specify the default
> drawing color. This also eliminates the need of the temporary file,
> you created only to apply a color.
Third solution: Stop rendering single parts! :-)
> Expect 2) to appear in the forthcoming release.
> /Lars
Thanks, Lars.
-- Terry K --
> > -----Original Message-----
> > From: legoverse@geocities.com [mailto:legoverse@geocities.com]
> > Sent: 11. marts 1999 01:45
> > To: lugnet.cad@lugnet.com
> > Subject: Problem with L3P
> >
> >
> > Lars,
> >
> > I have found what appears to be a flaw in L3P.
> > When rendering a single piece, the renderings always come out
> > in a grey (#7)
> > color. (1)
> >
> > For instance, make a dat file containing only a single 4073
> > 1x1 round stud.
> > Color it 33 for trans-blue. Then process it with L3P.
> >
> > What seems to happen is that, when processing only a single
> > piece, L3P writes
> > the #Declare line as equaling an "object" using the proper 33
> > color code.
> > But then Object line calls the declared item and gives it a
> > default color of
> > #7.
> >
> > When processing _more_ than one piece, L2P writes the
> > #Declare line as a
> > "Union". Which works properly.
> >
> > Changing the single part #Declare to = union fixes the problem.
> > But is it proper to have a single item declared a union?
> >
> > ---------
> > #declare 1x1round_dot_dat = object {
> > object { _4073_dot_dat matrix <snip> matrix <snip> #if
> > (version >= 3.1)
> > material #else texture #end { Color33 } }
> > }
> >
> > object { 1x1round_dot_dat #if (version >= 3.1) material #else
> > texture #end {
> > Color7 } }
> > ----------
> > Changing that first line like so to fix:
> > #declare 1x1round_dot_dat = union {
> >
> >
> > -- Terry K --
> > (1) Why the heck am I rendering single pieces? :-)
>
>
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Message is in Reply To:
 | | RE: Problem with L3P [DAT]
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| The Color7 is a "fallback" color. If no colors are defined in a model (which then most likely is a part) POV would use a DEFAULT black texture. I therefore used the grey (Color7) as LDraw does. Normally this is not a problem since a model typically (...) (26 years ago, 12-Mar-99, to lugnet.cad)
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