I was trial-and-erroring the other day with filter and transmit values
in rgbft, so I made this little chart to get an idea of what was going
on. Hope it helps.

Andy

--

--------------------
"There are three men in a boat with four cigarettes but no matches.
How do they smoke??"
  -The Riddler

Andrew Woodfin
UNC Charlotte Center for Precision Metrology
adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
--------------------

Post a reply to this message

Attachments:
Download 'transmit.jpg' (129 KB)

Preview of image 'transmit.jpg'

This is great! But perhaps it would look better if the floor was less brightly
coloured. Try a darker yellow and green, or perhaps a single colour I don't
really know the result. Also perhaps you should change the lighting angle, it
is hard to tell which is the sphere and which is the shadow in the more
translucent objects.

Andrew Woodfin wrote:

> I was trial-and-erroring the other day with filter and transmit values
> in rgbft, so I made this little chart to get an idea of what was going
> on. Hope it helps.
>
> Andy
>
> --
>
> --------------------
> "There are three men in a boat with four cigarettes but no matches.
> How do they smoke??"
>   -The Riddler
>
> Andrew Woodfin
> UNC Charlotte Center for Precision Metrology
> adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
> --------------------
>
>   ------------------------------------------------------------------------
>  [Image]

Post a reply to this message

Or in this case perhaps no shadows would be useful.


--


Mike Metheny
lon### [at] vtedu
mik### [at] loneshepherdcom
http://www.loneshepherd.com/

"When one's words are no better than silence, one should keep silent."

Post a reply to this message

Mike Metheny wrote:

> Or in this case perhaps no shadows would be useful.
>
> --
>
> Mike Metheny
> lon### [at] vtedu
> mik### [at] loneshepherdcom
> http://www.loneshepherd.com/
>
> "When one's words are no better than silence, one should keep silent."

 Here is a revised version, with no shadows and a larger size on the
checker. I left the checker in so that the effect of the transmit variable
would be more discernable than with a single color background.

Andy

--

--------------------
"There are three men in a boat with four cigarettes but no matches.
How do they smoke??"
  -The Riddler

Andrew Woodfin
UNC Charlotte Center for Precision Metrology
adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
--------------------

Post a reply to this message

Attachments:
Download 'transmit.jpg' (132 KB)

Preview of image 'transmit.jpg'

Very cool, indeed. This is such a help, thanks for doing this.   ;-]

KB-

Andrew Woodfin wrote:

> Mike Metheny wrote:
>
> > Or in this case perhaps no shadows would be useful.
> >
> > --
> >
> > Mike Metheny
> > lon### [at] vtedu
> > mik### [at] loneshepherdcom
> > http://www.loneshepherd.com/
> >
> > "When one's words are no better than silence, one should keep silent."
>
>  Here is a revised version, with no shadows and a larger size on the
> checker. I left the checker in so that the effect of the transmit variable
> would be more discernable than with a single color background.
>
> Andy
>
> --
>
> --------------------
> "There are three men in a boat with four cigarettes but no matches.
> How do they smoke??"
>   -The Riddler
>
> Andrew Woodfin
> UNC Charlotte Center for Precision Metrology
> adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
> --------------------
>
>   ------------------------------------------------------------------------
>  [Image]

Post a reply to this message

One more. Sorry about the filesize but tighter jpeg compression really
gummed the image up. This time the background is pure green and pure red, with
pure red spheres (e.g., pure red=rgb<1,0,0>). This helps to show the effect,
note where f=1.0 and t=0.0, the green checks are black since no green is
transmitted, but the red checks are indistinguishable from the rest of those in
the plane.
    Also of interest is the top right corner, where both values = 1.0; the red
value is intensified since the transmission imparted by each value adds.
    I apologize for the pattern's harshness to the eye, but it's more for
instruction than aesthetics. Also, the source is posted in p.t.s-f if anyone is
interested.

Andy

bankspad wrote:

> Very cool, indeed. This is such a help, thanks for doing this.   ;-]
>
> KB-
>


--

--------------------
"There are three men in a boat with four cigarettes but no matches.
How do they smoke??"
  -The Riddler

Andrew Woodfin
UNC Charlotte Center for Precision Metrology
adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
--------------------

Post a reply to this message

Attachments:
Download 'transmit.jpg' (358 KB)

Preview of image 'transmit.jpg'

I think I'm loosing it.  

The last post of yours I put in my NG/Uitls-Crack folder, but
this one totally baffles me.  

Thank you for all the work that you have put into these
experiment's, I'm sure that it will help many of us progress more
steadily than we would have done without this valuable
information.

Cheers
Steve 

Andrew Woodfin wrote:
> 
>     One more. Sorry about the filesize but tighter jpeg compression really
> gummed the image up. This time the background is pure green and pure red, with
> pure red spheres (e.g., pure red=rgb<1,0,0>). This helps to show the effect,
> note where f=1.0 and t=0.0, the green checks are black since no green is
> transmitted, but the red checks are indistinguishable from the rest of those in
> the plane.
>     Also of interest is the top right corner, where both values = 1.0; the red
> value is intensified since the transmission imparted by each value adds.
>     I apologize for the pattern's harshness to the eye, but it's more for
> instruction than aesthetics. Also, the source is posted in p.t.s-f if anyone is
> interested.
> 
> Andy
> 
> bankspad wrote:
> 
> > Very cool, indeed. This is such a help, thanks for doing this.   ;-]
> >
> > KB-
> >
> 
> --
> 
> --------------------
> "There are three men in a boat with four cigarettes but no matches.
> How do they smoke??"
>   -The Riddler
> 
> Andrew Woodfin
> UNC Charlotte Center for Precision Metrology
> adw### [at] unccedu | http://www.coe.uncc.edu/+AH4-adwoodfi
> --------------------
> 
>   -----------------------------------------------------------------
>  [Image]

Post a reply to this message

If someone ever asks about textures in POV-Ray these images would be a
great asset to help explain the difficulty in getting desired results in
such textures as those which contain filter and/or transmit.
Problem is that there are so many combinations, graphing them all would be
tedious if not impossible. Have you considered animating these? Then a
range of base colors could be seen incrementaly on a frame by frame basis,
essentially producing dozens of charts in a single animation.


Steve wrote:
> 
> I think I'm loosing it.
> 
> The last post of yours I put in my NG/Uitls-Crack folder, but
> this one totally baffles me.
> 
> Thank you for all the work that you have put into these
> experiment's, I'm sure that it will help many of us progress more
> steadily than we would have done without this valuable
> information.
> 
> Cheers
> Steve
> 
> Andrew Woodfin wrote:
> >
> >     One more. Sorry about the filesize but tighter jpeg compression really
> > gummed the image up. This time the background is pure green and pure red, with
> > pure red spheres (e.g., pure red=rgb<1,0,0>). This helps to show the effect,
> > note where f=1.0 and t=0.0, the green checks are black since no green is
> > transmitted, but the red checks are indistinguishable from the rest of those in
> > the plane.
> >     Also of interest is the top right corner, where both values = 1.0; the red
> > value is intensified since the transmission imparted by each value adds.
> >     I apologize for the pattern's harshness to the eye, but it's more for
> > instruction than aesthetics. Also, the source is posted in p.t.s-f if anyone is
> > interested.
> >
> > Andy
> >
> > bankspad wrote:
> >
> > > Very cool, indeed. This is such a help, thanks for doing this.   ;-]
> > >
> > > KB-
> > >
> >
> > --
> >
> > --------------------
> > "There are three men in a boat with four cigarettes but no matches.
> > How do they smoke??"
> >   -The Riddler
> >
> > Andrew Woodfin
> > UNC Charlotte Center for Precision Metrology
> > adw### [at] unccedu | http://www.coe.uncc.edu/+AH4-adwoodfi
> > --------------------
> >
> >   -----------------------------------------------------------------
> >  [Image]

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/homepage.htm
 mailto://inversez@aol.com?Subject=PoV-News

Post a reply to this message

Andrew Woodfin wrote:
> 
>     One more. Sorry about the filesize but tighter jpeg compression really
> gummed the image up. This time the background is pure green and pure red, with

When posting HUGE pictures like that, it's wise to type the imagesize in
the header or such. I don't care, because I'm on an ethernetconnection
at no cost at all, but there are modemusers (*g*) out there.


-- 
// Rikard Bosnjakovic - http://a214.ryd.student.liu.se/ - ICQ: 1158217

----------------------------------------------------------------------
     Before you criticize someone, walk a mile in his shoes. That
     way, if he gets angry, he'll be a mile away - and barefoot.
----------------------------------------------------------------------

Post a reply to this message

Bob Hughes wrote:

> If someone ever asks about textures in POV-Ray these images would be a
> great asset to help explain the difficulty in getting desired results in
> such textures as those which contain filter and/or transmit.
> Problem is that there are so many combinations, graphing them all would be
> tedious if not impossible. Have you considered animating these?

I have now! Thanks, Bob.


> Then a
> range of base colors could be seen incrementaly on a frame by frame basis,
> essentially producing dozens of charts in a single animation.
>

Andy
--

--------------------
"There are three men in a boat with four cigarettes but no matches.
How do they smoke??"
  -The Riddler

Andrew Woodfin
UNC Charlotte Center for Precision Metrology
adw### [at] unccedu | http://www.coe.uncc.edu/~adwoodfi
--------------------

Post a reply to this message