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Follow ups to .general.
"mr.art" wrote:
>
> What was causing me problems went like this:
> #declare texturename = texture{...}
> object{... texture{texturename turbulence value}}
> It had worked in one of the old pre povwin versions.
> When I dug out an old scene file, this started giving
> me problems. I had used a different turbulence value
> for different objects.
Art,
Ok. I tested the following in POV-Ray v2.2 and it did render as you said
it would. It would not render in POV-Ray for windows v3.1g watcom. Perhaps
it is a bug or was dropped to facilitate some other preferable funcionality
when POV-Ray v3.x was introduced. It might be related to the way the
turbulence modifier is not allowed in a patterned texture except after
all other modifiers are presented (illustrated at bottom of this message).
Either way lets see what the Gurus have to say about it.
Example:
light_source{< 0,0,-5>color rgb<1,1,1>}
camera{location<0,0,-3>look_at<0,0,0>}
#declare T1 =
texture
{
pigment
{ bozo
color_map { [0 color rgb<.5,0,0>][1 color rgb<1,1,1>]}
}
finish
{
ambient .4
diffuse .4
}
}
sphere{<0,1,5>,1 texture{ T1 scale .5 turbulence .5 }}
> Ken wrote:
> >
> > "mr.art" wrote:
> > >
> > > I know that this is a new user sort of question, but
> > > I haven't found the answer in the FAQ section. (yet)
> > > The Docs say that turbulence can be used in a texture.
> > > When I try, I get an error. What's up?
> >
> > It is dependent upon location in the texture.
> >
> > This will not work
> >
> > texture { bozo turbulence .5
> > texture_map{
> > [0 T1]
> > [1 T2]
> > }
> > }
> >
> > This will work
> >
> > texture { bozo
> > texture_map{
> > [0 T1]
> > [1 T2]
> > }
> > turbulence .5
> > }
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Ken wrote:
> It would not render in POV-Ray for windows v3.1g watcom.
For the record it will render in POV-Ray for windows v3.1g watcom
if you use the #version directive i.e. #version 2.0.
--
Ken Tyler - 1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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Ken wrote:
>
> Follow ups to .general.
>
> "mr.art" wrote:
> >
> > What was causing me problems went like this:
> > #declare texturename = texture{...}
> > object{... texture{texturename turbulence value}}
> > It had worked in one of the old pre povwin versions.
> > When I dug out an old scene file, this started giving
> > me problems. I had used a different turbulence value
> > for different objects.
>
> Art,
>
> Ok. I tested the following in POV-Ray v2.2 and it did render as you said
> it would. It would not render in POV-Ray for windows v3.1g watcom. Perhaps
> it is a bug or was dropped to facilitate some other preferable funcionality
> when POV-Ray v3.x was introduced. It might be related to the way the
> turbulence modifier is not allowed in a patterned texture except after
> all other modifiers are presented (illustrated at bottom of this message).
>
> Either way lets see what the Gurus have to say about it.
>
> Example:
>
> light_source{< 0,0,-5>color rgb<1,1,1>}
> camera{location<0,0,-3>look_at<0,0,0>}
>
> #declare T1 =
> texture
> {
> pigment
> { bozo
> color_map { [0 color rgb<.5,0,0>][1 color rgb<1,1,1>]}
> }
> finish
> {
> ambient .4
> diffuse .4
> }
> }
>
> sphere{<0,1,5>,1 texture{ T1 scale .5 turbulence .5 }}
>
>
> > Ken wrote:
> > >
> > > "mr.art" wrote:
> > > >
> > > > I know that this is a new user sort of question, but
> > > > I haven't found the answer in the FAQ section. (yet)
> > > > The Docs say that turbulence can be used in a texture.
> > > > When I try, I get an error. What's up?
> > >
> > > It is dependent upon location in the texture.
> > >
> > > This will not work
> > >
> > > texture { bozo turbulence .5
> > > texture_map{
> > > [0 T1]
> > > [1 T2]
> > > }
> > > }
> > >
> > > This will work
> > >
> > > texture { bozo
> > > texture_map{
> > > [0 T1]
> > > [1 T2]
> > > }
> > > turbulence .5
> > > }
Here's the texture syntax from the docs
TEXTURE:
PLAIN_TEXTURE | PATTERNED_TEXTURE | LAYERED_TEXTURE
PLAIN_TEXTURE:
texture { [TEXTURE_IDENTIFIER] [PNF_IDENTIFIER...] [PNF_ITEMS...]
}
PNF_IDENTIFIER:
PIGMENT_IDENTIFIER | NORMAL_IDENTIFIER | FINISH_IDENTIFIER
PNF_ITEMS:
PIGMENT | NORMAL | FINISH | TRANSFORMATION
LAYERED_TEXTURE:
NON_PATTERNED_TEXTURE...
PATTERNED_TEXTURE:
texture { [PATTERNED_TEXTURE_ID] [TRANSFORMATIONS...] } |
texture { PATTERN_TYPE [TEXTURE_PATTERN_MODIFIERS...] } |
texture { tiles TEXTURE tile2 TEXTURE [TRANSFORMATIONS...] } |
texture {
material_map{
BITMAP_TYPE "bitmap.ext" [MATERIAL_MODS...] TEXTURE...
[TRANSFORMATIONS...]
}
}
TEXTURE_PATTERN_MODIFIER:
PATTERN_MODIFIER | TEXTURE_LIST |
texture_map{ TEXTURE_MAP_BODY }
As you can see, a pattern modifier (such as turbulence)can be applied to
a
patterned texture but not to a plain texture. A simple texture
containing a
patterned pigment is still a plain teture.
Did v2.x have patterned textures? I can't remember and I don't have a
Linux
version of any early versions.
Goes to show, all scene files should use the #version directive, you
never
know how long that file will be around.
Cheers, PoD.
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PoD wrote:
> Did v2.x have patterned textures? I can't remember and I don't have a
> Linux version of any early versions.
Pov-Ray v2.2 did not allow for patterned textures.
> Goes to show, all scene files should use the #version directive, you
> never know how long that file will be around.
If anything when something used to work but does not now a version
directive can help isolate when the change occured.
You have to love the backward compatibility that POV-Ray offers !
--
Ken Tyler - 1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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I consider this a bug. An unintended limitation, technically. It's easy
enough (by adding 6 lines of code) to allow all warps (including turbulence
warps) to be applied to textures using texture{texturename modfiers}.
Currently, only transformations can be applied. We probably never want to
allow just plain 'turbulence', but putting turbulence in a warp is easy to
do and should be allowed.
-Nathan
Ken <tyl### [at] pacbell net> wrote...
>
>
> Follow ups to .general.
>
> "mr.art" wrote:
> >
> > What was causing me problems went like this:
> > #declare texturename = texture{...}
> > object{... texture{texturename turbulence value}}
> > It had worked in one of the old pre povwin versions.
> > When I dug out an old scene file, this started giving
> > me problems. I had used a different turbulence value
> > for different objects.
>
> Art,
>
> Ok. I tested the following in POV-Ray v2.2 and it did render as you said
> it would. It would not render in POV-Ray for windows v3.1g watcom. Perhaps
> it is a bug or was dropped to facilitate some other preferable
funcionality
> when POV-Ray v3.x was introduced. It might be related to the way the
> turbulence modifier is not allowed in a patterned texture except after
> all other modifiers are presented (illustrated at bottom of this message).
>
> Either way lets see what the Gurus have to say about it.
>
>
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Nathan Kopp wrote:
>
> I consider this a bug. An unintended limitation, technically. It's easy
> enough (by adding 6 lines of code) to allow all warps (including turbulence
> warps) to be applied to textures using texture{texturename modfiers}.
> Currently, only transformations can be applied. We probably never want to
> allow just plain 'turbulence', but putting turbulence in a warp is easy to
> do and should be allowed.
>
> -Nathan
What problems would be caused if a plain 'turbulence' where allowed ?
It worked nicely in v2.2 and in fact it is still allowed if you use
the #version directive. It seems it is more of an ommision rather
than an intended limitation.
--
Ken Tyler - 1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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