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Jon Wooldridge wrote in message <388C1D49.F23C00E1@gte.net>...
>Is it possible to create a normal_map (or similar) that does something
>like this, or do I have to resort to adding another cube?
A normal_map or bump_map using negative bump heights should work. (No
guarentees, I've never used bump/normal maps).
Mark
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Mark Wagner wrote:
>
> Jon Wooldridge wrote in message <388C1D49.F23C00E1@gte.net>...
> >Is it possible to create a normal_map (or similar) that does something
> >like this, or do I have to resort to adding another cube?
>
> A normal_map or bump_map using negative bump heights should work. (No
> guarentees, I've never used bump/normal maps).
>
> Mark
Another thing you can do with bump maps images is to use black patterns
on a white background. What this does is leave low areas where the pattern
is and raises the rest of the surface in effect giving you negative bump
mapping. On a two sided object such a sword blade you may have to split
it into two pieces, front and back, to get a different pattern on each
side and then union the two halves back together.
--
Ken Tyler - 1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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Ken wrote:
>
> Mark Wagner wrote:
> >
> > Jon Wooldridge wrote in message <388C1D49.F23C00E1@gte.net>...
> > >Is it possible to create a normal_map (or similar) that does
> something
> > >like this, or do I have to resort to adding another cube?
> >
> > A normal_map or bump_map using negative bump heights should work.
> (No
> > guarentees, I've never used bump/normal maps).
> >
> > Mark
>
> Another thing you can do with bump maps images is to use black
> patterns
> on a white background. What this does is leave low areas where the
> pattern
> is and raises the rest of the surface in effect giving you negative
> bump
> mapping. On a two sided object such a sword blade you may have to
> split
> it into two pieces, front and back, to get a different pattern on each
> side and then union the two halves back together.
>
> --
> Ken Tyler - 1300+ Povray, Graphics, 3D Rendering, and Raytracing
> Links:
> http://home.pacbell.net/tylereng/index.html
> http://www.povray.org/links/
Would it be stupid to use a heightfield for this?
Remco
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Remco de Korte wrote:
>
> Would it be stupid to use a heightfield for this?
>
> Remco
It would be difficult. The effect he wants is engraving rather than raised
areas. HF's would not apply well in this application I do not believe.
--
Ken Tyler - 1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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Remco de Korte wrote in message <388D808E.CEF10360@xs4all.nl>...
>
>Would it be stupid to use a heightfield for this?
>
>Remco
I've used height fields before for cutting pieces out of a surface and it
works quite well.
I do tend to have a problem getting the height field aligned, but that could
be just me.
Gail
*******************************************************************
* gsh### [at] monotix coza * ERROR: COFFEE.COM not found *
* http://www.rucus.ru.ac.za/~gail/ * Insert cup and press any key *
*******************************************************************
* Definition of an upgrade: Take the old bugs out, put new ones in*
*******************************************************************
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On Tue, 25 Jan 2000 03:28:37 -0800, Ken <tyl### [at] pacbellnet> wrote:
>
>
>Remco de Korte wrote:
>
>>
>> Would it be stupid to use a heightfield for this?
>>
>> Remco
>
>It would be difficult. The effect he wants is engraving rather than raised
>areas. HF's would not apply well in this application I do not believe.
Actually a HF is a very good idea for this case. The whole blade (half
of it anyway) can be modelled using a HF. Or, the HF clipping trick
can be used -- make a union of the HF clipped by the blade and the
blade clipped by the HF (see hfclip.pov in the standard demo files).
Peter Popov
pet### [at] usanet
ICQ: 15002700
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Peter Popov wrote:
>
> On Tue, 25 Jan 2000 03:28:37 -0800, Ken <tyl### [at] pacbellnet> wrote:
>
> >
> >
> >Remco de Korte wrote:
> >
> >>
> >> Would it be stupid to use a heightfield for this?
> >>
> >> Remco
> >
See PBI for a quick experiment.
The heightfield was cooked up with PSP, not the best tool for that.
Remco
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Remco de Korte wrote:
> Ken wrote:
> >
> > Mark Wagner wrote:
> > >
> > > Jon Wooldridge wrote in message <388C1D49.F23C00E1@gte.net>...
> > > >Is it possible to create a normal_map (or similar) that does
> > something
> > > >like this, or do I have to resort to adding another cube?
> > >
> > > A normal_map or bump_map using negative bump heights should work.
> > (No
> > > guarentees, I've never used bump/normal maps).
> > >
> > > Mark
> >
> > Another thing you can do with bump maps images is to use black
> > patterns
> > on a white background. What this does is leave low areas where the
> > pattern
> > is and raises the rest of the surface in effect giving you negative
> > bump
> > mapping. On a two sided object such a sword blade you may have to
> > split
> > it into two pieces, front and back, to get a different pattern on each
> > side and then union the two halves back together.
> >
> > --
> > Ken Tyler - 1300+ Povray, Graphics, 3D Rendering, and Raytracing
> > Links:
> > http://home.pacbell.net/tylereng/index.html
> > http://www.povray.org/links/
>
> Would it be stupid to use a heightfield for this?
>
> Remco
I see no reason you couldn't use a HF for this. The reason you wouldn't
want to is that the bump-map should be quite a bit faster than actual
geometry. That's determined by your situation, of course. If the camera is
going to be REALLY close to the sword, the HF will give you better results.
If not, don't bother.
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Despite your attempts to be anonymous, I have determined the following facts
about you:
You appear to live somewhere in the Orlando, Florida area and your ISP
appears to be Gate.net.
You are running Netscape 4.51 for Linux 2.2.6 (you might want to upgrade)
You have a Pentium I/II/III or similar computer
On March 30, your ISP appears to have given you the IP address 199.227.92.57
Your computer's clock is set a day ahead of what it should be
You appear to have a bias against Microsoft
Your first language is English
Big Brother
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Can you do that with anyone??
--
Regards,
Sander
Mark Wagner <mar### [at] gtenet> schreef in berichtnieuws
38e44dbf@news.povray.org...
> Despite your attempts to be anonymous, I have determined the following
facts
> about you:
>
> You appear to live somewhere in the Orlando, Florida area and your ISP
> appears to be Gate.net.
> You are running Netscape 4.51 for Linux 2.2.6 (you might want to upgrade)
> You have a Pentium I/II/III or similar computer
> On March 30, your ISP appears to have given you the IP address
199.227.92.57
> Your computer's clock is set a day ahead of what it should be
> You appear to have a bias against Microsoft
> Your first language is English
>
> Big Brother
>
>
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