Ken wrote:
> The following example shows how you can phase from white
> to light yellow and change the intensity of the spot
> colors without changing the shade of the colors
> choosen:

    ===>    [1.00 rgb<1.00,1.00,9.00>*1.35]

Ken let a typo creep in :)

Change that 9.00 to .900

-- 
Ken Tyler

tyl### [at] pacbellnet

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On Thu, 04 Feb 1999 13:06:00 -0800, Jason Scheuerman <mt### [at] nullnet>
wrote:

>I've been trying to figure out how to create a scene in which there is a
>light shining through a white linen cloth. For example, if you were to
>take a white bedsheet and hold it up near a lightbulb, you wouldn't see
>the exact outline of the bulb but you would see the light being
>dispersed through the sheet in a fuzzy outline.  (Am I making myself
>clear?)  Anyone know how to accoplish this in POV?
>
>Jason Scheuerman
>mt### [at] nullnet

Well, if you a hardcoding-only POV-Ray nutcake (my ICQ nick is
pov-nut) you could  try using the SuperPatch to create a function for
an isosurface and use it as 1) an ithersection of two isosurfaces
situated closely to make the sheet and 2) a density pattern for a
scattering media in the sheet to do the fuzzy light effect you are
after.

Just a thought.

Peter

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Hey, you _are_ a nut :)
I'd just make the sheet out of bezier patches and use a simple constant
scattering media inside. Probably not too dense, so that a little bit of
non-diffuse transparency would remain.

Margus

Peter Popov wrote:
> 
> Well, if you a hardcoding-only POV-Ray nutcake (my ICQ nick is
> pov-nut) you could  try using the SuperPatch to create a function for
> an isosurface and use it as 1) an ithersection of two isosurfaces
> situated closely to make the sheet and 2) a density pattern for a
> scattering media in the sheet to do the fuzzy light effect you are
> after.
> 
> Just a thought.
> 
> Peter

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Didn't try it and don't know if it works, but a texture map using the
spherical pattern could do the trick. The outer texture would have the
regular bedsheet texture while the inner texture would have a high ambient
value and some filter or transmit value. The spherical pattern is centered
at <0,0,0> so it's easy to position.

Gilles Tran

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Margus Ramst wrote
> 
> Hey, you _are_ a nut :)
> I'd just make the sheet out of bezier patches and use a simple constant
> scattering media inside. Probably not too dense, so that a little bit of
> non-diffuse transparency would remain.

the buzzer says : Wrooooong !
since a bezier hav no inside/outside, you can't put a media in it...

now, maybe an ordinary container with a dense marble media,
where a thin vein (in 3D) plays the piece of clothe...

Fabien.

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Yes you can. Just checked. Worked just fine. The patches simply have to make
up a closed volume. I'm not sure if it works well with very complicated
patches, but in principle, it works.
Your idea isn't too bad, but you have very little control over the shape of
the sheet.

Margus

Fabien Mosen <101### [at] compuservecom> wrote in message
<36BB3F4F.3463DBD0@compuserve.com>...

>the buzzer says : Wrooooong !
>since a bezier hav no inside/outside, you can't put a media in it...
>
>now, maybe an ordinary container with a dense marble media,
>where a thin vein (in 3D) plays the piece of clothe...
>
>Fabien.

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On Fri, 05 Feb 1999 13:49:30 +0200, Margus Ramst <mar### [at] peakeduee>
wrote:

>Hey, you _are_ a nut :)

>I'd just make the sheet out of bezier patches and use a simple constant
>scattering media inside. Probably not too dense, so that a little bit of
>non-diffuse transparency would remain.
>
>Margus
>
>Peter Popov wrote:
>> 
>> Well, if you a hardcoding-only POV-Ray nutcake (my ICQ nick is
>> pov-nut) you could  try using the SuperPatch to create a function for
>> an isosurface and use it as 1) an ithersection of two isosurfaces
>> situated closely to make the sheet and 2) a density pattern for a
>> scattering media in the sheet to do the fuzzy light effect you are
>> after.
>> 
>> Just a thought.
>> 
>> Peter

Excerpt from an ICQ chat I had recently, quoted without permission,
but I don't care. I didn't save this chat for obvious reasons but this
one I cut'n'pasted. The chatter's name is changed (he/she was random
anyway)

--------------------
<chatter> What the f&^% is this s*&$$# name pov-nut?

<pov-nut> Well, POV stands for "Persistence of Vision" which is my
favourite program for three-dimensional art, and nut... well, I'm a
nutcake

<chatter> &^%$, a geek! *&^( u, I'm leaving u, u r scaring me
--------------------

So tell me guys, is it really that bad, being a pov-nut?

Peter

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Peter Popov wrote:

> So tell me guys, is it really that bad, being a pov-nut?
> 
> Peter

It is good to be bad !

-- 
Ken Tyler

tyl### [at] pacbellnet

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This is rather hilarious and enlightening.
I often encounter people in the offline world who would only have made
out that word "art" there; I know, hard to believe isn't that. But
seeing that was a chat me-thinks there could have even been an ignorance
of that word as well. Maybe the person thought it was "fart" or
something typo'd. (never fear, read between the lines here and you'll
see I'm making fun of "chatter".
In answer to your question, from my point of view, you better not be or
we're all in trouble! LOL

Peter Popov wrote:
> 
> Excerpt from an ICQ chat I had recently, quoted without permission,
> but I don't care. I didn't save this chat for obvious reasons but this
> one I cut'n'pasted. The chatter's name is changed (he/she was random
> anyway)
> 
> --------------------
> <chatter> What the f&^% is this s*&$$# name pov-nut?
> 
> <pov-nut> Well, POV stands for "Persistence of Vision" which is my
> favourite program for three-dimensional art, and nut... well, I'm a
> nutcake
> 
> <chatter> &^%$, a geek! *&^( u, I'm leaving u, u r scaring me
> --------------------
> 
> So tell me guys, is it really that bad, being a pov-nut?
> 
> Peter

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.htm
=Bob

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Are you talking about a light on one side of the sheet illuminating the
the opposite side (the sheet is between you and the light, and you can
see light on the sheet)?  If this is what you want, try using a bezier
patch or a mesh of smooth triangles.  With these objects, light illuminates
both sides of the object.

-Nathan

Jason Scheuerman wrote:
> 
> I've been trying to figure out how to create a scene in which there is a
> light shining through a white linen cloth. For example, if you were to
> take a white bedsheet and hold it up near a lightbulb, you wouldn't see
> the exact outline of the bulb but you would see the light being
> dispersed through the sheet in a fuzzy outline.  (Am I making myself
> clear?)  Anyone know how to accoplish this in POV?
> 
> Jason Scheuerman
> mt### [at] nullnet

Post a reply to this message