|
 |
/*
This file shows a bug in the spotted pattern. The bug manifests in
a visible square grid in the spotted pattern. It is also visible
in the bozo pattern.
The bumps normal does not show such a problem.
The bug does not show up when the patterns bozo, spotted and bumps
are used as pigments
Reference:
Message-ID: <38323B08.E75DD458@enst.fr>
Date: Tue, 16 Nov 1999 21:20:08 -0800
From: "Jerome M. BERGER" <jbe### [at] enst fr>
Newsgroups: povray.binaries.images
This bug has been verified by myself. System details follow:
CPU: AuthenticAMD AMD-K6tm w/ multimedia extensions, clock 193 MHz
RAM: 96 MB
OS : Microsoft Windows 98 4.10.1998
POV: Version 3.1g.watcom.win32 [Pentium II Optimised]
Peter Popov
pet### [at] usanet
*/
union
{
sphere { y+x, 1 }
box { -1, 1 translate y-x }
texture
{
pigment { color rgb 1 }
finish { phong 1 }
normal { spotted 0.5 scale 1 }
}
}
light_source { <500,0,-100> color rgb 1 }
light_source { <0,500,-100> color rgb 1 }
camera
{
location <0.0 , 0.0 ,-2.25>
up y
right x
look_at <0.0 , 0.0 , 0.0>
orthographic
}
Peter Popov
ICQ: 15002700
Post a reply to this message
|
|
|
|
Peter Popov <pet### [at] usanet> wrote...
> /*
> This file shows a bug in the spotted pattern. The bug manifests in
> a visible square grid in the spotted pattern. It is also visible
> in the bozo pattern.
>
> The bumps normal does not show such a problem.
>
> The bug does not show up when the patterns bozo, spotted and bumps
> are used as pigments
>
Actually, the bozo/spotted pattern _does_ show this bug when used as a
pigment (it is just very subtle). Below is a scene (modified from the one
provided by Peter), that puts the bozo bumps on a plane. It will also
create contour lines in the pigment. If you look closely, you can see how
the contour lines in the pigment match the grid-like pattern.
Therefore, this is most likely a bug in the bozo pattern itself, and is
probably related to what Xander posted a week or so ago.
-Nathan
// begin POV scene
plane{
z,0
texture
{
#declare pig=yes;
#if (pig)
pigment { bozo color_map{
// s is delta for the contour lines
#declare s=.05
#declare a=0;
#while(a<=1)
[a rgb 1]
[a+s/4 rgb 1]
[a+s/4 rgb .5]
[a+s/4*2 rgb .5]
[a+s/4*2 rgb 1]
#declare a=a+s;
#end
}
scale 1}
finish { specular 1 }
#else
pigment { color rgb 1 }
finish { specular 1 }
#end
normal { bozo 0.5*5
slope_map{[0 <0,0>][1 <1,0>]}
scale 1 }
}
}
light_source { <500,0,-100> color rgb 1 }
// light_source { <0,500,-100> color rgb 1 }
camera
{
location <0.0 , 0.0 ,-2.25>*2
up y
right x
look_at <0.0 , 0.0 , 0.0>
orthographic
}
Post a reply to this message
|
|
