/*
Please reply to the group povray.general (and povray.bugreports if you
can confirm this is a genuine certified 100% bug).

I find the following texture renders markedly differently in 3.5 compared
with both 3.0.20-10 debian and megapovplus 0.5.0.2.5a-1 (3.1 equivalent),
which both render the images similarly to each other.

It looks to me like the grade between 0 and 1.0 in the texture map of the
older versions is quite different to the grade in 3.5 .. for example as
if one used a linear gradient and the other an exponential one. I hope
someone understand what I mean.

I don't see this mentioned in the documentation or in the bugs so far 
listed in povray.general or povray.bugreports, or by googling old usenet 
postings.

I haven't played much with 3.5, but have checked that if I use a plain
pigment it is the same color.

Can someone tell me this is a bug, or is expected behaviour and why? If
so, how do i figure out how to translate an old-style texture into a new
one?

Images attached to this message -- see beneath the scene data below:

Simeon
*/

#include "colors.inc"
#version 3.0

//test.pov                  
//bah there is some bug in the 3.5 textures i think         
//Simeon Scott 2003-02-01 ////////////////////////
//Something like a blue agate.
/////////////////////////////


background
  { color White }

global_settings
{
  ambient_light 0.05
  assumed_gamma 1
}

camera
{
  location <0, 0, -3>
  look_at <0, 0, 0>
  scale 0.2
}

light_source
  {  <2, 4, -3> color White scale 0.4 }

#declare Sim_Blue_Agate = texture
{
  waves
  texture_map	
  {
    [  0.15 pigment { color White }        ]
    [  1.0  pigment { color <0, 0, 0.3> }  ]
  }
  turbulence <10, 10, 0.3>
  scale 0.1
}

sphere
  {  <0, 0, 0>, 0.3	texture {  Sim_Blue_Agate } }



// end of scene data .. image data follows (3 images)

/*

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Attachments:
Download 'test_3.0.jpg' (11 KB) Download 'test_3.5.jpg' (8 KB) Download 'test_mega0.5.jpg' (11 KB)

Preview of image 'test_3.0.jpg'

Preview of image 'test_3.5.jpg'

Preview of image 'test_mega0.5.jpg'