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From: Tom Melly
Subject: megapov bug
Date: 7 Feb 2001 12:32:27
Message: <3a8186ab$1@news.povray.org>
The following code fails in both pov and megapov (list too long) - but
megapov crashes. Sometimes (well, with varients of this - this version
always seems to crash immediately), the crash occurs straight away,
sometimes I get the standard error message, but them mp crashes on the next
attempt to render (even when I have corrected the fault by increasing the
increment of n to 0.1)

I'm using mp 6a

#declare n = 0;
#declare TestPigment =
pigment{
  bozo
  pigment_map{
    #while(n<=1)
      [n rgb 1]
      #declare n = n + 0.000001;
    #end
  }
}


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From: Christophe Bouffartigue
Subject: Re: megapov bug
Date: 7 Feb 2001 12:41:28
Message: <3A8188C7.4208CEE6@nanterre.marelli.fr>
Tom Melly wrote:

(something)

It's because of the 256 map entries limitations....

Bouf.


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From: Ken
Subject: Re: megapov bug
Date: 7 Feb 2001 12:43:40
Message: <3A8189F6.4937A03A@pacbell.net>
Tom Melly wrote:
> 
> The following code fails in both pov and megapov (list too long) - but
> megapov crashes.

You are not allowed more than 256 entries in a color map which explains
the warning message in the official version. You are correct however in
assuming that MP should not crash as a result.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/


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From: Warp
Subject: Re: megapov bug
Date: 7 Feb 2001 12:48:32
Message: <3a818a70@news.povray.org>
Christophe Bouffartigue <Chr### [at] nanterremarellifr> wrote:
: It's because of the 256 map entries limitations....

  That's right, but crashing is still a bug.

-- 
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/


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From: Christoph Hormann
Subject: Re: megapov bug
Date: 7 Feb 2001 13:59:44
Message: <3A819B20.178355ED@gmx.de>
Ken wrote:
> 
> You are not allowed more than 256 entries in a color map which explains
> the warning message in the official version. You are correct however in
> assuming that MP should not crash as a result.
> 

I think Chris Huff was working on removing that limitation, or was it
someone else?

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/


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From: Ken
Subject: Re: megapov bug
Date: 7 Feb 2001 14:14:16
Message: <3A819F31.8892A310@pacbell.net>
Christoph Hormann wrote:
> 
> Ken wrote:
> >
> > You are not allowed more than 256 entries in a color map which explains
> > the warning message in the official version. You are correct however in
> > assuming that MP should not crash as a result.
> >
> 
> I think Chris Huff was working on removing that limitation, or was it
> someone else?

What would be gained by it ?

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/


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From: Nicolas Calimet
Subject: Re: megapov bug
Date: 7 Feb 2001 16:17:37
Message: <3A81CC82.DB3B2CF@free.fr>
> > I think Chris Huff was working on removing that limitation, or was it
> > someone else?
> 
> What would be gained by it ?

	The delightful idea that no software should contain size limitations
of any kind. Especially since today's home computers may accept several Gbytes
of onboard memory. I personnaly don't think that (again nowadays) memory size,
as disk space, is a "good reason" compared to CPU time. But even the last becomes
smaller day after day for the same jobs. So why bother with limitations ?

	[Well, sorry for that, but I'm currently enjoying supercomputers for
my research calculations, and once I ran a "small" job using 96 processors in
parallel. Was just for fun since 8 are much more efficient in my case... the
device has something like 256 R12000 MIPS processors though]


*** Nicolas Calimet
*** http://pov4grasp.free.fr


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From: Chris Huff
Subject: Re: megapov bug
Date: 7 Feb 2001 16:43:23
Message: <chrishuff-1EB4D0.16442407022001@news.povray.org>
In article <3A819B20.178355ED@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> I think Chris Huff was working on removing that limitation, or was it
> someone else?

I was, but haven't gotten it working right yet. If my code got stuck in 
0.7, that might explain the crash...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><


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From: Chris Huff
Subject: Re: megapov bug
Date: 7 Feb 2001 16:45:32
Message: <chrishuff-C8DEEF.16463307022001@news.povray.org>
In article <3A819F31.8892A310@pacbell.net>, lin### [at] povrayorg 
wrote:

> What would be gained by it ?

Simple: the ability to have more than 255 elements in blend maps.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><


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From: Warp
Subject: Re: megapov bug
Date: 8 Feb 2001 07:42:33
Message: <3a829438@news.povray.org>
The problem with dynamic data containers is that they usually take extra
memory (at least temporarily) and are sometimes slower than fixed-sized
data containers.

  Of course this shouldn't matter in this case since the required size can
be calculated first, then a proper array allocated and initialized from the
input.

-- 
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/


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