POV-Ray : Newsgroups : povray.beta-test : light doesn't pass transparent parts of image_map Server Time
19 Jun 2024 06:15:09 EDT (-0400)
  light doesn't pass transparent parts of image_map (Message 1 to 3 of 3)  
From: Bob Hughes
Subject: light doesn't pass transparent parts of image_map
Date: 21 Dec 2005 11:01:57
Message: <43a97c75$1@news.povray.org>
3.7.0.beta.11b.icl8.win32

Only did a little checking about this but looks like only image_map is 
affected, not other transparent things using transmit or filter in colors, 
and I didn't find any mention of it after a quick search. The script below 
uses the sample test image included with POV that says POV-Ray on it (in 
white) along with letter pairs in black for each quarter section: TL, TR, 
BL, BR (I'll post similar resulting rendered images from 3.6 and 3.7 at 
beta-test.binaries to show which image file I'm talking about, but others do 
same anyway).

Also, although this uses clipped_by here, I first noticed this in a CSG 
difference used to hollow the sphere so the shell would have thickness but 
it seems to only be about the image_map+transparency+light_source somehow.

camera { location -3*z }

light_source { <10,10,-10>, color rgb <1,1,1> }

sphere { 0,1
 clipped_by {
  box { 0,1 inverse }
 }
  pigment {
   image_map {
    gif "test.gif" // test image
    map_type 1
    transmit 4, 1
   }
  }
 rotate <30,150,0>
}


Post a reply to this message

From: Bob Hughes
Subject: Re: light doesn't pass transparent parts of image_map
Date: 23 Dec 2005 02:41:07
Message: <43abaa13@news.povray.org>
camera { location -3*z }

light_source { <10,10,-10>, color rgb <1,1,1> }

sphere { 0,1
clipped_by {
 box { 0,1 inverse }
}
 pigment {
  image_map {
   png "test.png" // test image
   map_type 1
   transmit 4, 1
  }
 }
rotate <30,150,0>
}

Just realized that GIF should probably be a PNG instead, since file format 
been changed for the more recent POV distributions. Sorry for any confusion 
due to that.


Post a reply to this message

From: Chris Cason
Subject: Re: light doesn't pass transparent parts of image_map
Date: 17 Feb 2006 21:06:45
Message: <43f68135@news.povray.org>
Fixed, thanks for the report.

-- Chris


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.