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1. '|' and '&'
According to POV-Help 6.5.4.4.1&2, the operator '|' means merge
and '&' means intersection.
But these operators don't work properly on beta 8.
For example, following isosurface is not the intersection
of two spheres.
isosurface{
function { f_sphere(x,y,z,1) & f_sphere(x+0.5,y,z,1)}
}
These were ok on beta 7.
2. 'int()'
The function 'int()' does not work in isosurface.
Try the following isosurface.
isosurface{
function { int(0.5)}
threshold 0.5
}
POV-Ray crashes on my PC.
POV-Ray for Windows 3.5 beta 8, Windows Me, Celeron 600MHz
R. Suzuki
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Wasn't it R. Suzuki who wrote:
>1. '|' and '&'
> According to POV-Help 6.5.4.4.1&2, the operator '|' means merge
> and '&' means intersection.
> But these operators don't work properly on beta 8.
> For example, following isosurface is not the intersection
> of two spheres.
> isosurface{
> function { f_sphere(x,y,z,1) & f_sphere(x+0.5,y,z,1)}
> }
>
> These were ok on beta 7.
>
>2. 'int()'
> The function 'int()' does not work in isosurface.
> Try the following isosurface.
> isosurface{
> function { int(0.5)}
> threshold 0.5
> }
>
> POV-Ray crashes on my PC.
> POV-Ray for Windows 3.5 beta 8, Windows Me, Celeron 600MHz
I confirm these, but will entertain suggestions that #1 might be
mathematically correct as long as the intersection and merge of
isosurfaces now get documented this way round.
--
Mike Williams
Gentleman of Leisure
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In article <3c082dbe@news.povray.org> , "R. Suzuki" <r-s### [at] aist gojp>
wrote:
> 1. '|' and '&'
> According to POV-Help 6.5.4.4.1&2, the operator '|' means merge
> and '&' means intersection.
> But these operators don't work properly on beta 8.
> For example, following isosurface is not the intersection
> of two spheres.
The operators work as designed, the documentation hasn't been updated. The
operators don't mean merge or interesection. Unse min and max. Or if there
is demand, I could add a difference and an intersection function (with two
or more arguments!).
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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"Thorsten Froehlich" wrote :
> The operators work as designed, the documentation hasn't been updated.
The
> operators don't mean merge or interesection. Unse min and max. Or if
there
> is demand, I could add a difference and an intersection function (with two
> or more arguments!).
I used these operators as geometric operators in the isosurface patch
because it seems to be common in this field.
See http://wwwcis.k.hosei.ac.jp/~F-rep/HF_oper.html
If those are not allowed, how about "iso_union(A, B, C, D, ...)" and
"iso_intersection(A, B, C, D, ...)".
R. Suzuki
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In article <3c091260@news.povray.org> , "R. Suzuki" <r-s### [at] aistgojp>
wrote:
> I used these operators as geometric operators in the isosurface patch
> because it seems to be common in this field.
> See http://wwwcis.k.hosei.ac.jp/~F-rep/HF_oper.html
I know, but unfortunately POV-Ray defines the same operators to work like
logic in the parser, and as functions can be used anywhere and for
consistency they really have to work as in the parser.
I will look into adding union and intersection (no new keywords). BTW, do
you by any chance know how (if possible at all) to implement a 'difference'?
the link you provided suggests it is possible. SO if it would be a really
simple implementation I might be able to add it as well...
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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Thorsten Froehlich wrote:
>
> I will look into adding union and intersection (no new keywords). BTW, do
> you by any chance know how (if possible at all) to implement a 'difference'?
> the link you provided suggests it is possible. SO if it would be a really
> simple implementation I might be able to add it as well...
>
difference is simply intersection with the inverse (negative in isosurface
if you have threshold 0)
Anyway i think other things are more important. ;-)
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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"Thorsten Froehlich" wrote:
>BTW, do you by any chance know how (if possible at all) to
>implement a 'difference'? the link you provided suggests it is
>possible. SO if it would be a really simple implementation I might
>be able to add it as well...
This is really simple as Christoph pointed out.
See POV Help 3.4.4.5.
(The operators in these documents should be also fixed.)
R. Suzuki.
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"Thorsten Froehlich" wrote:
>I will look into adding union and intersection (no new keywords).
In MATLAB, which is one of the most commonly used mathematical
programing language, there are UNION(A,B) function and
INTERSECT(A,B) function, but the meaning is totally different.
So, those function names will confuse some people.
R. Suzuki
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In article <3c09efee@news.povray.org> , "R. Suzuki" <r-s### [at] aistgojp>
wrote:
> In MATLAB, which is one of the most commonly used mathematical
> programing language, there are UNION(A,B) function and
> INTERSECT(A,B) function, but the meaning is totally different.
> So, those function names will confuse some people.
Maybe I should just leave it as is and only create a min and max function
that take more than two arguments. It would still keep the syntax as simple
as it was with & and | and avoid misunderstandings.
I will also fix the & and | using min/max so they behave like true boolean
operators...
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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"Thorsten Froehlich" wrote
>only create a min and max function that take more than two
>arguments.
This would be nice.
R. Suzuki
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