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Request for Enhancement
I would like to be able to make real hollow objects. I know you
can specify an object to be "hollow" but you can't put a light
inside it and have it shine through windows you have cut out of
the object.
A real hollow object, like a cube, would be differenced with a
cube slightly smaller than itself (say 1% smaller in each
direction).
--
See my Free stuff page. It compares free website providers, and
lists free internet access providers.
http://www.crosswinds.net/~robertsc/free.htm
Win98 help file loaded with hints and tips, including securing a
Win 95/98 PC in a classroom setting. VB4 help file with lots of
code and hints.
At http://www.crosswinds.net/~robertsc/
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Chuck Roberts wrote:
>
> Request for Enhancement
>
> I would like to be able to make real hollow objects. I know you
> can specify an object to be "hollow" but you can't put a light
> inside it and have it shine through windows you have cut out of
> the object.
>
> A real hollow object, like a cube, would be differenced with a
> cube slightly smaller than itself (say 1% smaller in each
> direction).
You are now requesting a feature change/addition that would have
to be implemented in POV-Ray itself which has nothing to do with
the functionality of Moray.
http://www.students.tut.fi/~warp/povVFAQ/languageVFAQ.html#hollowobjects
--
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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Not really. Moray would just do the few steps for me.
1. Create shape. (shape 1)
2. Create cutout of shape which is slightly smaller. (shape 2)
3. Make a difference group, subtract cutout from shape 1.
Ken wrote:
>
> Chuck Roberts wrote:
> >
> > Request for Enhancement
> >
> > I would like to be able to make real hollow objects. I know you
> > can specify an object to be "hollow" but you can't put a light
> > inside it and have it shine through windows you have cut out of
> > the object.
> >
> > A real hollow object, like a cube, would be differenced with a
> > cube slightly smaller than itself (say 1% smaller in each
> > direction).
>
> You are now requesting a feature change/addition that would have
> to be implemented in POV-Ray itself which has nothing to do with
> the functionality of Moray.
>
> http://www.students.tut.fi/~warp/povVFAQ/languageVFAQ.html#hollowobjects
>
> --
> Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
> http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
--
See my Free stuff page. It compares free website providers, and
lists free internet access providers.
http://www.crosswinds.net/~robertsc/free.htm
Win98 help file loaded with hints and tips, including securing a
Win 95/98 PC in a classroom setting. VB4 help file with lots of
code and hints.
At http://www.crosswinds.net/~robertsc/
Post a reply to this message
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Hi Chuck Roberts, you recently wrote in moray.win:
> A real hollow object, like a cube, would be differenced with a
> cube slightly smaller than itself (say 1% smaller in each
> direction).
You need to do this with CSG. Moray is a Solid Geometry modeller and
POV-Ray is a solids renderer (for the most part).
- Lutz
email : lut### [at] stmuc com
Web : http://www.stmuc.com/moray
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What dou you mean by cut away? Do you cut within the object (not visible
from the outside) or do you drill holes from the outside to the inside
(or vice versa) that are visible?
If you do the first, be sure to make the texture transparent by adding a
bit of filter or transmit so that the light can shine through. Please
note that the lightsource itself will not become visible!
If you do the second, the cutaway texture has to be completely clear
(filter and transmit set to 1).
If I still missed the thing, let me know.
Karl
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the problem with that idea is thickness. how will moray know what to
make it? and should the thickness be even or irregular? besides, the
need for purely hollow objects just doesn't come up often enough for
lutz to spend time adding a feature like that. however, he has made a
plugin sdk available, and if you would like to, you can make such a
plugin yourself. as for myself i don't mind the 6 or 8 clicks it takes
to make a hollow object.
Chuck Roberts wrote:
>
> Not really. Moray would just do the few steps for me.
> 1. Create shape. (shape 1)
> 2. Create cutout of shape which is slightly smaller. (shape 2)
> 3. Make a difference group, subtract cutout from shape 1.
>
> Ken wrote:
> >
> > Chuck Roberts wrote:
> > >
> > > Request for Enhancement
> > >
> > > I would like to be able to make real hollow objects. I know you
> > > can specify an object to be "hollow" but you can't put a light
> > > inside it and have it shine through windows you have cut out of
> > > the object.
> > >
> > > A real hollow object, like a cube, would be differenced with a
> > > cube slightly smaller than itself (say 1% smaller in each
> > > direction).
> >
> > You are now requesting a feature change/addition that would have
> > to be implemented in POV-Ray itself which has nothing to do with
> > the functionality of Moray.
> >
> > http://www.students.tut.fi/~warp/povVFAQ/languageVFAQ.html#hollowobjects
> >
> > --
> > Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
> > http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
>
> --
> See my Free stuff page. It compares free website providers, and
> lists free internet access providers.
> http://www.crosswinds.net/~robertsc/free.htm
>
> Win98 help file loaded with hints and tips, including securing a
> Win 95/98 PC in a classroom setting. VB4 help file with lots of
> code and hints.
> At http://www.crosswinds.net/~robertsc/
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Chuck Roberts wrote:
> Request for Enhancement
>
> I would like to be able to make real hollow objects. I know you
> can specify an object to be "hollow" but you can't put a light
> inside it and have it shine through windows you have cut out of
> the object.
>
> A real hollow object, like a cube, would be differenced with a
> cube slightly smaller than itself (say 1% smaller in each
> direction).
Well, for good cutouts, why not use a CSG with scaling? That way, you
don't really have to create anything new; just scale the object down a
bit and subtract from the original. Seems easy enough.
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"Chuck Roberts" <rob### [at] accnorg> wrote in message
news:399182CA.48BA17CE@accn.org...
|
| I would like to be able to make real hollow objects. I know you
| can specify an object to be "hollow" but you can't put a light
| inside it and have it shine through windows you have cut out of
| the object.
Using 'clipped_by' in POV-Ray is how you would do that, I don't know if
Moray has that ability or not.
Everything is hollow actually (not media hollow though) since all objects
are only a surface with inside and outside (well, most everything is). So
what is going wrong when you try it is the 'difference' of one object from
another which leaves behind another surface at the cutaway. Clipping
doesn't leave a surface where it is done, only a missing section of surface,
with the remaining object essentially hollowed out.
I didn't understand this was what you were talking about at first until I
realized you were thinking of differencing away a object with another. That
is why lights or camera inside a box with little boxes cutting into the
outside walls don't open into the interior. Only problem with clipped_by is
that there is no thickness to the clipped object.
Bob
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Chuck Roberts <rob### [at] accnorg> wrote:
> Not really. Moray would just do the few steps for me.
> 1. Create shape. (shape 1)
> 2. Create cutout of shape which is slightly smaller. (shape 2)
> 3. Make a difference group, subtract cutout from shape 1.
But how much smaller is smaller? It should be specified, and is there some
skew (thicker on one side or another)? What about non-primatives? Can they
be hollowed too? Really, this is easy to do with a CSG, and there are
enough variables that doing it that way gives more flexibility.
If you're making lots of similar shapes, just create one, copy and translate
it so you don't have to go through it lots of times.
If you really want it, you could make a plugin for it, but I really don't
see the need.
Geoff
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