POV-Ray : Newsgroups : povray.binaries.images : Test your PovRay knowledge! Server Time
18 Nov 2024 14:25:49 EST (-0500)
  Test your PovRay knowledge! (Message 1 to 6 of 6)  
From: Felbrigg
Subject: Test your PovRay knowledge!
Date: 22 Apr 2004 12:15:56
Message: <4087efbc$1@news.povray.org>
Heres a test for you.  I've pasted extracts from two scenes into the
attached image.

I changed two things in the scene file to get the two differnt looks.

First I changed the light color from red to white.

Then I changed a single numeric value, can you guess what it was?

Clue : its a radiosity scene.

Good luck.


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Attachments:
Download 'WhatsTheDifference.jpg' (20 KB)

Preview of image 'WhatsTheDifference.jpg'
WhatsTheDifference.jpg


 

From: Roberto Amorim
Subject: Re: Test your PovRay knowledge!
Date: 22 Apr 2004 12:40:43
Message: <4087f58b@news.povray.org>
> I changed two things in the scene file to get the two differnt looks.
>
> First I changed the light color from red to white.
>
> Then I changed a single numeric value, can you guess what it was?

42.

And don't tell me I'm wrong. :-)


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From: St 
Subject: Re: Test your PovRay knowledge!
Date: 22 Apr 2004 14:31:12
Message: <40880f70@news.povray.org>
"Roberto Amorim" <wol### [at] hotmailcom> wrote in message
news:4087f58b@news.povray.org...


> > Then I changed a single numeric value, can you guess what it was?
>
> 42.
>
> And don't tell me I'm wrong. :-)

    You're wrong! (Heh, someone had to say it...)

    It's 37.55784748595765, and I'm RIGHT!!  I think...    ;)

     ~Steve~


>
>


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From: Edward Coffey
Subject: Re: Test your PovRay knowledge!
Date: 22 Apr 2004 18:11:52
Message: <40884328$1@news.povray.org>
Ambient?


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From: Dan P
Subject: Re: Test your PovRay knowledge!
Date: 22 Apr 2004 19:38:42
Message: <40885782$1@news.povray.org>
Felbrigg wrote:
> Heres a test for you.  I've pasted extracts from two scenes into the
> attached image.
> 
> I changed two things in the scene file to get the two differnt looks.
> 
> First I changed the light color from red to white.
> 
> Then I changed a single numeric value, can you guess what it was?
> 
> Clue : its a radiosity scene.
> 
> Good luck.

Here's my guess:
You are using a crackles density pattern.
You changed the scale of the density:

scale <1, 1, 1>*n
where n is the number you changed (can be /n as well)

Wild guess, really :-)
-- 
Respectfully,
Dan P
http://<broken link>


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From: Felbrigg
Subject: Re: Test your PovRay knowledge!
Date: 23 Apr 2004 04:32:13
Message: <4088d48d$1@news.povray.org>
And the Answer is....

error_bound in the radiosity settings was reduced from 1.2 to 0.1

The intresting thing is that the lower the value the more accurate.  If you
look at the image on the left you can see that swathes of "radiosity" are
pasted across the front of the text, which strictly speaking is wrong
because its the back of the text that is giving off the light.  So the
higher setting of 1.2 was putting light when it should not been.

You may actually have to be a PovRay weenie like me to find that
interesting.


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