Hello,

Is there a way to do this in Povray? With curling edges?

Thanks...
Wijnand Nijs

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> Is there a way to do this in Povray? With curling edges?


The best way would probably be to make an object (height field or maybe
bicubic patch or even a mesh) with regular edges, and then use an image to
texture_map it; have it transition between two textures, one transparent
(for the areas of paper which are ripped off around the edges) and one with
a paper texture.

 - Slime
 [ http://www.slimeland.com/ ]

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I'd say

 a mesh with normals that matches the stains: I
did something quite similar for my dominos. It's
supposed to be like dried paint.

For the edge, I'd do as Slime suggested.


Best,

    S.


--
Steven Pigeon, Ph. D.
ste### [at] stevenpigeoncom
ste### [at] videotronca
"Wijnand Nijs" <w.j### [at] alf4alldemonnl> wrote in message
news:40f04bcc@news.povray.org...
> Hello,
>
> Is there a way to do this in Povray? With curling edges?
>
> Thanks...
> Wijnand Nijs
>

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Slime wrote:
>>Is there a way to do this in Povray? With curling edges?
> The best way would probably be to make an object (height field or maybe
> bicubic patch or even a mesh) with regular edges, and then use an image to
> texture_map it; have it transition between two textures, one transparent
> (for the areas of paper which are ripped off around the edges) and one with
> a paper texture.

Well, call me a masochist, but it should be able to be done somewhat
easily (conceptually, at least) with an isosurface.  And the texture
could be done as POV-texture, too, but would take some planning...;)

I'll avoid saying what I'm working on at the moment lest you think I'm
excessively bizarre (it can wait 'til I'm done, if I ever figure it
out...)

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------

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Wijnand Nijs wrote:
> Hello,
> 
> Is there a way to do this in Povray? With curling edges?
> 
> Thanks...
> Wijnand Nijs
> 
> ------------------------------------------------------------------------
> 
Hello,

Height field, mesh or isosurface? Because I always wanted to start to do 
something with isosurfaces, I started with the advice of Tom Cook.

Pov-help and the isosurface tutorial was a great help, but I have still 
some problems. How to make the image transparent for the areas of paper 
which are ripped off around the edges (advice of Slime)?

The source is:
#declare F = function {z+f_noise3d(x*5, y*5, 0)*0.3}

isosurface {
   function { abs(F(x,y,z))-0.05 }
     max_gradient 2
     pigment {
       image_map {gif "parchment.gif"}
       translate <0.5,0.5,0.5>
       scale 2
     }
}

Some parameters must be tuned, first the big problems.

Thanks in advance...
Wijnand Nijs

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Wijnand Nijs wrote:
> Pov-help and the isosurface tutorial was a great help, but I have still 
> some problems. How to make the image transparent for the areas of paper 
> which are ripped off around the edges (advice of Slime)?

Actually, I was thinking more of having the edges be part of the
isosurface, eliminating need for a transparency mask...I'm sure
some creatively applied noise to the perimeter would do the trick?

But if you want a transparency mask, example code would be

#declare Tex0    =texture{pigment{image_map{gif "parchment.gif"}}}
#declare Tex1    =texture{pigment{rgbt 1}}
#declare ParchTex=texture{image_pattern{gif "ParchmentMask.gif"} 
texture_map{[0 Tex0][1 Tex1]}}


-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------

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Timothy Cook wrote:
> Wijnand Nijs wrote:
> 
>> Pov-help and the isosurface tutorial was a great help, but I have 
>> still some problems. How to make the image transparent for the areas 
>> of paper which are ripped off around the edges (advice of Slime)?
> 
> 
> Actually, I was thinking more of having the edges be part of the
> isosurface, eliminating need for a transparency mask...I'm sure
> some creatively applied noise to the perimeter would do the trick?
> 
> But if you want a transparency mask, example code would be
> 
> #declare Tex0    =texture{pigment{image_map{gif "parchment.gif"}}}
> #declare Tex1    =texture{pigment{rgbt 1}}
> #declare ParchTex=texture{image_pattern{gif "ParchmentMask.gif"} 
> texture_map{[0 Tex0][1 Tex1]}}
> 

Hai Tim,

Nice not? The edges as part of the isosurface is for the future. Thank 
for the help, also to the others.

Greetings...
Wijnand Nijs

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