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From: Jörg 'Yadgar' Bleimann
Subject: MyMaglev: C++ automation (almost) finished
Date: 2 Jul 2009 20:22:06
Message: <4a4d4f2e@news.povray.org>
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High!
As announced, I wrote a C++ routine to generate animated camera rides
along the tracks of the developing MyMaglev Personal Rail Cabin
System... the program (details see p.b.s-f) runs quite well, except for
some odd artifact, probably a coincident surfaces issue (see attached
images).
Currently, I hardly have an idea why these black squares show up... it
seems to have something to do with the CSG construction of the ground
cutouts!
See you in Khyberspace!
Yadgar
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Attachments:
Download 'cabinrailway_new4_101.png' (27 KB)
Download 'cabinrailway_new4_309.png' (21 KB)
Preview of image 'cabinrailway_new4_101.png'
Preview of image 'cabinrailway_new4_309.png'
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> High!
>
> As announced, I wrote a C++ routine to generate animated camera rides
> along the tracks of the developing MyMaglev Personal Rail Cabin
> System... the program (details see p.b.s-f) runs quite well, except for
> some odd artifact, probably a coincident surfaces issue (see attached
> images).
>
> Currently, I hardly have an idea why these black squares show up... it
> seems to have something to do with the CSG construction of the ground
> cutouts!
>
> See you in Khyberspace!
>
> Yadgar
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
How do you model the grove in the track? Is it a difference? If so, make
the cutting object red, ambient 0.5. Does the problems areas turn red?
Alain
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From: Jörg 'Yadgar' Bleimann
Subject: Re: MyMaglev: C++ automation (almost) finished
Date: 5 Jul 2009 09:14:51
Message: <4a50a74b@news.povray.org>
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High!
Alain wrote:
> How do you model the grove in the track? Is it a difference? If so, make
> the cutting object red, ambient 0.5. Does the problems areas turn red?
No, the whole track profile is a lathe object! When I removed the ground
plane with the cutout, the black squares disappeared, but another
strange effect showed up (see attached images). In the oblique view it
looks as the side parts of the track profile extend much further than
its bottom, although the overhead view shows that this is not the
case... strange!
See you in Khyberspace!
Yadgar
Post a reply to this message
Attachments:
Download '2009-07-05 port whatmough personal rail cabin system test track, take 1.jpg' (13 KB)
Download '2009-07-05 port whatmough personal rail cabin system test track, take 2.jpg' (13 KB)
Preview of image '2009-07-05 port whatmough personal rail cabin system test track, take 1.jpg'
Preview of image '2009-07-05 port whatmough personal rail cabin system test track, take 2.jpg'
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> High!
>
> Alain wrote:
>
>> How do you model the grove in the track? Is it a difference? If so,
>> make the cutting object red, ambient 0.5. Does the problems areas turn
>> red?
>
> No, the whole track profile is a lathe object! When I removed the ground
> plane with the cutout, the black squares disappeared, but another
> strange effect showed up (see attached images). In the oblique view it
> looks as the side parts of the track profile extend much further than
> its bottom, although the overhead view shows that this is not the
> case... strange!
>
> See you in Khyberspace!
>
> Yadgar
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
It looks like the botton is to low. Look closely at the top view. there
is a gap near the end of the track
Try a lateral view.
Alain
Post a reply to this message
Attachments:
Download '2009-07-05 port whatmough personal rail cabin system test track, take 2.jpg' (5 KB)
Preview of image '2009-07-05 port whatmough personal rail cabin system test track, take 2.jpg'
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From: Jörg 'Yadgar' Bleimann
Subject: Re: MyMaglev: C++ automation (almost) finished
Date: 6 Jul 2009 05:13:57
Message: <4a51c055$1@news.povray.org>
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High!
> No, the whole track profile is a lathe object! When I removed the ground
> plane with the cutout, the black squares disappeared, but another
> strange effect showed up (see attached images). In the oblique view it
> looks as the side parts of the track profile extend much further than
> its bottom, although the overhead view shows that this is not the
> case... strange!
Obviously it is because the profile contains a hollow shaped like an
upside-down "T" (which was intended!), so that the vertical side parts
do not connect with the ground immediately.
The black squares disappeared when I corrected my original precaution
against coincident surfaces problems: in the cutout definition, I
originally rotated the subtracting box 0.0001 degrees more than given in
the angle parameter from the segment definition file, but forgot that in
case of a left turn this tiny amount must be subtracted from the
original value rather than added!
object
{
Bend_Subtraction_Block
#if (ang >=0)
rotate y*(ang+0.0001)
#else
rotate y*(ang-0.0001)
#end
}
See you in Khyberspace!
Yadgar
Now playing: To The Shore (Duran Duran)
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