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From: Marc-Hendrik Bremer
Subject: How do I make a Hightfield with an Isosurface?
Date: 6 Jan 2001 08:36:44
Message: <3a571f6c@news.povray.org>
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Hi!
I'm trying to make sort of an relief from a picture. It works okay as an
Hightfield, but I want to give it some additional structures. So I try to
make an Isosurface out of the image using a pigment-function with an
image_map. For some reason it does not work.
It is probably nothing difficult, but I can't get it. I bet it's one of
those "orientation in 3D"-mistakes, but I tried quiet a few things and get
This is my pigment:
#declare HundFN=
function{
pigment{
image_map{
png "Hund-Hf.png" // the file to read (iff/gif/tga/png/sys)
map_type 0 // 0=planar, 1=spherical, 2=cylindrical, 5=torus
interpolate 2 // 0=none, 1=linear, 2=bilinear, 4=normalized
distance
once
} // image_map
rotate x*-90
}
}
and my function-call in the isosurface:
isosurface {
function { z
-0.5*(HundFN((x)/20,(y)/20,0))
}
method 2
eval
accuracy 0.001
contained_by{box {<-10.1,-10.1,-1.5>,<10.1,10.1,1.5>}}
texture{
pigment{rgb 1}
}
}
What am I doing wrong?
Thanks,
Marc-Hendrik
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From: Marc-Hendrik Bremer
Subject: Re: How do I make a Hightfield with an Isosurface?
Date: 6 Jan 2001 08:55:20
Message: <3a5723c8@news.povray.org>
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Sorry , got it myself. I won my bet :-)
Thanks anyway,
Marc-Hendrik
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Marc-Hendrik Bremer wrote:
> What am I doing wrong?
The rotation is wrong (your hf is pointing downwards) and the base function
should be y instead of z.
Try this instead :
#declare HundFN=function{pigment{image_map{png "Hund-Hf.png"}rotate x*90}}
isosurface {
function { y - 0.5*HundFN(x,y,z)}
contained_by{box {0,1}}
pigment{rgb 1}
translate <-0.5,0,-0.5>
scale <3,1,3>
}
G.
--
**********************
http://www.oyonale.com
**********************
Graphic experiments
Pov-ray gallery
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From: Christoph Hormann
Subject: Re: How do I make a Hightfield with an Isosurface?
Date: 6 Jan 2001 09:11:34
Message: <3A572795.7668A0B2@gmx.de>
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Marc-Hendrik Bremer wrote:
>
> Sorry , got it myself. I won my bet :-)
>
> Thanks anyway,
>
> Marc-Hendrik
Well, in such cases it often helps me to use the same pigment for the
texture, you immediately get a better idea of the problem.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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From: Marc-Hendrik Bremer
Subject: Re: How do I make a Hightfield with an Isosurface?
Date: 6 Jan 2001 09:14:02
Message: <3a57282a@news.povray.org>
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Thanks Gilles!
You are faster than light :-)
I removed my rotation, left the base function the way it is and added the
image-function, cause I want the HF in the z plane. But that makes no real
difference, I think.
Marc-Hendrik
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