"Kirk Andrews" <kir### [at] hotmailcom> wrote:

> Pov is looking for "function {GateF(x,y,z).gray}"  It will always require
> ..gray or .red etc. if you are using a pigment function (including a
> bitmap).

DOH!  I re-read the section in the manual for isosurface at least three
times today and still did not get that little item about the function
looking for the .gray color component.  Now it renders perfectly.  Thank
you, Kirk for providing a very useful example!  Examples like this should
be in the manual!

-Allan

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"Allan" <all### [at] WholeCheesecom> schreef in bericht 
news:web.4675eaff753da72387a47510@news.povray.org...
> "Kirk Andrews" <kir### [at] hotmailcom> wrote:
>
>> Pov is looking for "function {GateF(x,y,z).gray}"  It will always require
>> ..gray or .red etc. if you are using a pigment function (including a
>> bitmap).
>
> DOH!  I re-read the section in the manual for isosurface at least three
> times today and still did not get that little item about the function
> looking for the .gray color component.  Now it renders perfectly.  Thank
> you, Kirk for providing a very useful example!  Examples like this should
> be in the manual!
>

If I remember well, somebody once said that, to gain a little bit of parse 
(and render?) time, .red (or .green, or .blue) would be preferable to .gray 
as POV-Ray only considers a grey image anyway.

Thomas

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Thomas de Groot nous apporta ses lumieres en ce 2007/06/18 03:43:
> "Allan" <all### [at] WholeCheesecom> schreef in bericht 
> news:web.4675eaff753da72387a47510@news.povray.org...
>> "Kirk Andrews" <kir### [at] hotmailcom> wrote:
>>
>>> Pov is looking for "function {GateF(x,y,z).gray}"  It will always require
>>> ..gray or .red etc. if you are using a pigment function (including a
>>> bitmap).
>> DOH!  I re-read the section in the manual for isosurface at least three
>> times today and still did not get that little item about the function
>> looking for the .gray color component.  Now it renders perfectly.  Thank
>> you, Kirk for providing a very useful example!  Examples like this should
>> be in the manual!
>>
> 
> If I remember well, somebody once said that, to gain a little bit of parse 
> (and render?) time, .red (or .green, or .blue) would be preferable to .gray 
> as POV-Ray only considers a grey image anyway.
> 
> Thomas
> 
> 
You can use .red, .green, .blue, .x, .y or .z when you have a B/W image or 
pattern. This will save you render time (for an isosurface) as you only evaluate 
1 colour component instead of evaluating all 3 and averaging them.
You must use .gray when you have a colour image or pattern.

-- 
Alain
-------------------------------------------------
I find that the harder I work, the more luck I seem to have.
Thomas Jefferson

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"Alain" <ele### [at] netscapenet> schreef in bericht 
news:467656d5$1@news.povray.org...
>>
>>
> You can use .red, .green, .blue, .x, .y or .z when you have a B/W image or 
> pattern. This will save you render time (for an isosurface) as you only 
> evaluate 1 colour component instead of evaluating all 3 and averaging 
> them.
> You must use .gray when you have a colour image or pattern.
>

Yes, of course, that makes sense!  :-)
Thanks Alain.

Thomas

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I like it but the contrast could be even higher: Much of the
scenery behind the gate is made of rather dark trees now, so
the intensity is dominated by the sky, and the gate blends
into the background. Maybe make the trees brighter?

And it could be more magical if the sky looked gloomy over the
wall, but blue through the doorway. And how about some emitting
media streaking out of the gate ;)

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