POV-Ray : Newsgroups : povray.unix : FYI. Watch out for bad color to grey value conversions. : Re: FYI. Watch out for bad color to grey value conversions. Server Time
6 Dec 2021 06:11:01 EST (-0500)
  Re: FYI. Watch out for bad color to grey value conversions.  
From: Cousin Ricky
Date: 31 Jan 2021 10:50:00
Message: <6016d1a8$1@news.povray.org>
On 2021-01-31 2:06 AM (-4), William F Pokorny wrote:
> On 1/31/21 12:44 AM, William F Pokorny wrote:
>> On 1/30/21 1:46 PM, Le_Forgeron wrote:
> ...
>> The block at the top is acting like there are only 4 color channels 
>> moving 't' to the fourth channel and not supporting 'f'. The bottom 
>> block with the longer names is acting like there are 5 color channels 
>> still with both filter and transmit.
>>
>> How is this code consistent? Seems to me only one or the other can be 
>> right - meaning one set is wrong. Am I missing something?
>>
> ...
> 
> And I am missing something. Just popped into my head. The t doesn't 
> stand for transmit. It's just a character index into the last entry of a 
> 4D vector (time?). I shouldn't post on getting up in the middle of the 
> night - no coffee at all in my system. :-|

That's one of the more confusing aspects of POV-Ray.  For clarity, I 
only use .t when I'm dealing with non-color 4-D vectors; for colors, I 
spell out .filter and .transmit.

Maybe it should be spelled out in the docs in Impact or Arial Black: .t 
DOES NOT STAND FOR TRANSMIT!


Post a reply to this message

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.