6ish hours on 1.8 GHz/512 DDR

Wanted to do spherical heightfield.  No specific info in docs.
Isosurface hmm, it can use pigments, la la l...hey wait, you
can use images in pigments.  Go my thinking process!

Mars bump is 16k x 8k, texture half that.  Not high enough res
to make out 'face'...oh well :P

-- 
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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Attachments:
Download 'bluemars.jpg' (63 KB)

Preview of image 'bluemars.jpg'

Awww... that's preeeeety :-)

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Timothy Cook <z99### [at] bellsouthnet> wrote:
> 6ish hours on 1.8 GHz/512 DDR
>
> Wanted to do spherical heightfield.  No specific info in docs.
> Isosurface hmm, it can use pigments, la la l...hey wait, you
> can use images in pigments.  Go my thinking process!
>
> Mars bump is 16k x 8k, texture half that.  Not high enough res
> to make out 'face'...oh well :P
>
> --
> 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------

Your Blue Mars effort inspired me.  I had been wanting to create a spherical
height field for analyses that I was doing on Mars' surface features.  I
created an isosurface based on a Mars topo map as pigment.  The attached
image is the result so far (without the ocean sphere).  I can't seem to get
a complete map of the surface in spherical form.  Weird.  Is your map
complete?

Rick Smith

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Attachments:
Download 'isosurface.jpg' (27 KB)

Preview of image 'isosurface.jpg'

"Richard Smith" <rms### [at] penet> wrote in message
news:web.40bb5389f72d05f9a14125e90@news.povray.org...
>
> Your Blue Mars effort inspired me.  I had been wanting to create a
spherical
> height field for analyses that I was doing on Mars' surface features.  I
> created an isosurface based on a Mars topo map as pigment.  The attached
> image is the result so far (without the ocean sphere).  I can't seem to
get
> a complete map of the surface in spherical form.  Weird.  Is your map
> complete?

Seeing as you haven't gotten a reply here yet, looks like the median pigment
value is at the threshold. Meaning, maybe you could change 'threshold' to
something other than 0 (greater than) and get the rest to show up. Either
that or a max_gradient being too low, but that usually doesn't appear so
clean in my experiences.

So if this was done by adding the function to a sphere the black parts are
probably ending up less than zero and so below the container sphere's
surface, if I'm thinking of all this correctly. I might be way off.

To Timothy Cook:  Wow! That's a beautiful view from space!

Bob H.

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"Hughes, B." <omn### [at] charternet> wrote:
> "Richard Smith" <rms### [at] penet> wrote in message
> news:web.40bb5389f72d05f9a14125e90@news.povray.org...
> >
> > Your Blue Mars effort inspired me.  I had been wanting to create a
> spherical
> > height field for analyses that I was doing on Mars' surface features.  I
> > created an isosurface based on a Mars topo map as pigment.  The attached
> > image is the result so far (without the ocean sphere).  I can't seem to
> get
> > a complete map of the surface in spherical form.  Weird.  Is your map
> > complete?
>
> Seeing as you haven't gotten a reply here yet, looks like the median pigment
> value is at the threshold. Meaning, maybe you could change 'threshold' to
> something other than 0 (greater than) and get the rest to show up. Either
> that or a max_gradient being too low, but that usually doesn't appear so
> clean in my experiences.
>
> So if this was done by adding the function to a sphere the black parts are
> probably ending up less than zero and so below the container sphere's
> surface, if I'm thinking of all this correctly. I might be way off.
>
> To Timothy Cook:  Wow! That's a beautiful view from space!
>
> Bob H.

I'll check the things you mentioned.  I'm not entirely sure I am using
isosurface correctly.
Thanks for the suggestions.

Rick Smith

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Richard Smith wrote:
> "Hughes, B." <omn### [at] charternet> wrote:
>>"Richard Smith" <rms### [at] penet> wrote:
>>>Your Blue Mars effort inspired me.  I had been wanting to create a
>>>spherical height field for analyses that I was doing on Mars' surface features.  I
>>>created an isosurface based on a Mars topo map as pigment.  The attached
>>>image is the result so far (without the ocean sphere).  I can't seem to
>>>get a complete map of the surface in spherical form.  Weird.  Is your map
>>>complete?
>>Seeing as you haven't gotten a reply here yet, looks like the median pigment
>>value is at the threshold. Meaning, maybe you could change 'threshold' to
>>something other than 0 (greater than) and get the rest to show up. Either
>>that or a max_gradient being too low, but that usually doesn't appear so
>>clean in my experiences.
>>
>>So if this was done by adding the function to a sphere the black parts are
>>probably ending up less than zero and so below the container sphere's
>>surface, if I'm thinking of all this correctly. I might be way off.
>>
>>To Timothy Cook:  Wow! That's a beautiful view from space!
> I'll check the things you mentioned.  I'm not entirely sure I am using
> isosurface correctly.
> Thanks for the suggestions.

Er...whoah, I didn't even see these replies originally...sorry!  ^_^;;

Hang on, let's see if your post is still there...

-- 
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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Richard Smith wrote:
> Your Blue Mars effort inspired me.  I had been wanting to create a spherical
> height field for analyses that I was doing on Mars' surface features.  I
> created an isosurface based on a Mars topo map as pigment.  The attached
> image is the result so far (without the ocean sphere).  I can't seem to get
> a complete map of the surface in spherical form.  Weird.  Is your map
> complete?

Hmm ok, here 'tis...yeah, as B. Hughes noted, looks like you have some
values extending byeond some boundary and being clipped.

-- 
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 <z99### [at] bellsouthnet> wrote:
> Richard Smith wrote:
> > Your Blue Mars effort inspired me.  I had been wanting to create a spherical
> > height field for analyses that I was doing on Mars' surface features.  I
> > created an isosurface based on a Mars topo map as pigment.  The attached
> > image is the result so far (without the ocean sphere).  I can't seem to get
> > a complete map of the surface in spherical form.  Weird.  Is your map
> > complete?
>
> Hmm ok, here 'tis...yeah, as B. Hughes noted, looks like you have some
> values extending byeond some boundary and being clipped.
>
> --
> Tim Cook
> http://home.bellsouth.net/p/PWP-empyrean
>
I've tried changing all the parameters but am unable to make the image any
more complete than it is.

Rick Smith

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Richard Smith wrote:
> I've tried changing all the parameters but am unable to make the image any
> more complete than it is.

humm...well, here's my code for the isosurface...with commentary

#include "functions.inc"
#declare fn_MarsPigm=function{
   pigment{
     image_map{
       tga "D:\3D\Textures\Mars\RMv3_Bump16K.tga"
       map_type 1
       once
       interpolate 4
     }
     scale  <-1,1,1>   // right-hand rule; makes more sense to me,
     rotate 90*x       // since i started out doing autosketch/cad
   }
}
isosurface{
   function{f_sphere(x, y, z, 3375)-fn_MarsPigm(x, y, z).red*30}
   // mars mean diam 3375 km, topo range 30 km...the image is greyscale
   // but pov's 'gray' function is weighted...? so i used red component
   contained_by{sphere{0,5000}}  // probably a bit much O.o;;
   pigment{
     image_map{
       jpeg "D:\3D\Textures\Mars\RMv3_FlatColor4K.jpg"
       map_type 1
       once
       interpolate 4
     }
     scale  <-1,1,1>
     rotate 90*x
   }
}
EOF

i included it in a moray document with some other stuff, and voila!

-- 
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------

Post a reply to this message

Timothy Cook <z99### [at] bellsouthnet> wrote:
> Richard Smith wrote:
> > I've tried changing all the parameters but am unable to make the image any
> > more complete than it is.
>
> humm...well, here's my code for the isosurface...with commentary
>
> #include "functions.inc"
> #declare fn_MarsPigm=function{
>    pigment{
>      image_map{
>        tga "D:3DTexturesMarsRMv3_Bump16K.tga"
>        map_type 1
>        once
>        interpolate 4
>      }
>      scale  <-1,1,1>   // right-hand rule; makes more sense to me,
>      rotate 90*x       // since i started out doing autosketch/cad
>    }
> }
> isosurface{
>    function{f_sphere(x, y, z, 3375)-fn_MarsPigm(x, y, z).red*30}
>    // mars mean diam 3375 km, topo range 30 km...the image is greyscale
>    // but pov's 'gray' function is weighted...? so i used red component
>    contained_by{sphere{0,5000}}  // probably a bit much O.o;;
>    pigment{
>      image_map{
>        jpeg "D:3DTexturesMarsRMv3_FlatColor4K.jpg"
>        map_type 1
>        once
>        interpolate 4
>      }
>      scale  <-1,1,1>
>      rotate 90*x
>    }
> }
> EOF
>
> i included it in a moray document with some other stuff, and voila!
>
> --
> Tim Cook
> http://home.bellsouth.net/p/PWP-empyrean
>
Thenks Tim.  I'll compare your code to mine and see if I've muffed it.

Rick Smith

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