POV-Ray : Newsgroups : povray.beta-test.binaries : Radiosity POV 3.6 vs. 3.7 vs. MCPov : Got it!: Server Time
23 Feb 2024 21:36:35 EST (-0500)
  Got it!:  
From: Ive
Date: 19 Jan 2009 08:10:15
Message: <49747bb7@news.povray.org>
clipka wrote:

> At the moment I'm suspecting the floor to pick up light from below for some
> reason. What is the floor made of, geometrically speaking?
> 

  Just a box ;)


#declare W = 500.0;
#declare L = 664.6;
#declare H = 323.6;

//==============================================================
// room
//==============================================================

union {
// floor
   box { <0,0, 1> <W,-1,-L-1>  texture {T_Floor} }

  ... and a lot of more stuff


But here is the interesting thing:


#declare T_Floor = texture {
   material_map { png "Floor#2"
     texture {T_FloorMortar}
     texture {T_FloorWhite}
     texture {T_FloorBlack}
     texture {T_FloorBlack translate  79}
     texture {T_FloorBlack translate 255}
   }
   rotate x*90
   rotate y*45
   scale 117.2/2
   translate <-20.0, 0, 0>
}


where each of the separate textures is a quite complicated layered 
texture. Suspicion was that either the heavy layered textures or the 
material_map statement did mess up things.
So a quick simplification:

#declare T_FloorWhite_simple = texture
{
   pigment {rgb 0.55}
   finish {ambient 0  diffuse 1}
}

#declare T_FloorBlack_simple = texture
{
   pigment {rgb 0.05}
   finish {ambient 0  diffuse 1}
}

#declare T_Floor = texture {
   checker
   texture {T_FloorWhite_simple}, texture {T_FloorWhite_simple}
   rotate x*90
   rotate y*45
   scale 117.2/2
   translate <-20.0, 0, 0>
}

and the result is still weird! See picture 1.

But then:

#declare T_Floor = texture {
   texture {T_FloorWhite_simple}
   rotate x*90
   rotate y*45
   scale 117.2/2
   translate <-20.0, 0, 0>
}

works perfectly as expected (low quality aside). Picture 2.

This effect can be easily reproduced in any other scene.


So it seems to me that the problem is maybe not even related to 
radiosity but it is to patterned textures. Maybe it has something to do 
with he post by me to p.beta-test from 4/25/2008 "texture_map vs. 
pigment_map" - that never got a response ;(


-Ive


Post a reply to this message


Attachments:
Download 'musiclesson-simple1.jpg' (50 KB) Download 'musiclesson-simple2.jpg' (77 KB)

Preview of image 'musiclesson-simple1.jpg'
musiclesson-simple1.jpg

Preview of image 'musiclesson-simple2.jpg'
musiclesson-simple2.jpg


 

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