POV-Ray : Newsgroups : povray.binaries.images : Moire patterns when trying to create isosurface sphere Server Time: 19 Jun 2019 07:01:38 GMT
  Moire patterns when trying to create isosurface sphere (Message 1 to 10 of 26)  
Goto Latest 10 Messages Next 10 Messages >>>
From: COMPATT
Subject: Moire patterns when trying to create isosurface sphere
Date: 3 Jan 2019 05:30:01
Message: <web.5c2d9dae5e758c193008c61f0@news.povray.org>
The sphere should be solid right up to the edge but I get "Moire Patterns"
instead


Post a reply to this message


Attachments:
Download 'moire problem.png' (39 KB)

Preview of image 'moire problem.png'
moire problem.png


 

From: Dave Blandston
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 3 Jan 2019 06:05:01
Message: <web.5c2da53746f01a8179416a1f0@news.povray.org>
"COMPATT" <com### [at] hotmailcom> wrote:
> The sphere should be solid right up to the edge but I get "Moire Patterns"
> instead

Hi there,

I don't know what those lines are but they do not look like moire patterns to
me. I could be wrong, of course, but maybe considering other possibilities might
help you troubleshoot your problem.

Regards,
Dave Blandston


Post a reply to this message

From: COMPATT
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 3 Jan 2019 06:20:00
Message: <web.5c2da94246f01a813008c61f0@news.povray.org>
"Dave Blandston" <nomail@nomail> wrote:
> "COMPATT" <com### [at] hotmailcom> wrote:
> > The sphere should be solid right up to the edge but I get "Moire Patterns"
> > instead
>
> Hi there,
>
> I don't know what those lines are but they do not look like moire patterns to
> me. I could be wrong, of course, but maybe considering other possibilities might
> help you troubleshoot your problem.
>
> Regards,
> Dave Blandston

This is the same image file just using a different anti-aliasing (method 3)
always shows up at the edge of the illuminated part of the sphere. Thanks for
the quick response.


Post a reply to this message


Attachments:
Download 'moire problem.png' (62 KB)

Preview of image 'moire problem.png'
moire problem.png


 

From: Dave Blandston
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 3 Jan 2019 06:45:00
Message: <web.5c2daeea46f01a8179416a1f0@news.povray.org>
"COMPATT" <com### [at] hotmailcom> wrote:
> This is the same image file just using a different anti-aliasing (method 3)
> always shows up at the edge of the illuminated part of the sphere. Thanks for
> the quick response.

Yep, those are moire patterns for sure! I will have to defer to the experts from
this point on...

Regards,
Dave Blandston


Post a reply to this message

From: jr
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 4 Jan 2019 23:55:00
Message: <web.5c2ff1e346f01a8148892b50@news.povray.org>
with 'polarity on'


Post a reply to this message


Attachments:
Download 'compatt.png' (39 KB)

Preview of image 'compatt.png'
compatt.png


 

From: Dave Blandston
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 5 Jan 2019 04:05:00
Message: <web.5c302cb046f01a8179416a1f0@news.povray.org>
"jr" <cre### [at] gmailcom> wrote:
> with 'polarity on'

Glad you found a solution!

Regards,
Dave Blandston


Post a reply to this message

From: jr
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 5 Jan 2019 20:25:00
Message: <web.5c31118446f01a8148892b50@news.povray.org>
"Dave Blandston" <nomail@nomail> wrote:
> Glad you found a solution!

cheers Dave.  too late, it seems, to be of use to COMPATT.


regards, jr.


Post a reply to this message

From: Kenneth
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 6 Jan 2019 18:10:00
Message: <web.5c32438746f01a81cd98345b0@news.povray.org>
"jr" <cre### [at] gmailcom> wrote:
> with 'polarity on'

??

What's that? I must have missed a new feature(?) somehow...


Post a reply to this message

From: jr
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 6 Jan 2019 18:45:00
Message: <web.5c324c5646f01a8148892b50@news.povray.org>
hi,

"Kenneth" <kdw### [at] gmailcom> wrote:
> "jr" <cre### [at] gmailcom> wrote:
> > with 'polarity on'
> ??
> What's that? I must have missed a new feature(?) somehow...

looks like you did.  :-)  the last paragraph in section "3.5.1.1.6 Isosurface"
in the 3.8 docs reads:

By default, the inside of an isosurface is defined as the set of all points
inside the contained_by shape where the function values are below the threshold.
New in version 3.8 this can be changed via the polarity keyword. Specifying a
positive setting or on will instead cause function values above the threshold to
be considered inside. Specifying a negative setting or off will give the default
behavior.


regards, jr.


Post a reply to this message

From: Kenneth
Subject: Re: Moire patterns when trying to create isosurface sphere
Date: 6 Jan 2019 22:50:00
Message: <web.5c3284ff46f01a81cd98345b0@news.povray.org>
"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> "Kenneth" <kdw### [at] gmailcom> wrote:
> > "jr" <cre### [at] gmailcom> wrote:
> > > with 'polarity on'
> > ??
> > What's that? I must have missed a new feature(?) somehow...
>
> looks like you did.  :-)  the last paragraph in section "3.5.1.1.6 Isosurface"
> in the 3.8 docs reads: ...
>

Thanks! Yep, it's new to me. (And I was wondering where those moire patterns
were coming from-- thinking that the planet was just a simple sphere object, not
an isosurface.)


Post a reply to this message

Goto Latest 10 Messages Next 10 Messages >>>

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.