Jaime Vives Piqueres wrote:

>   In a related point, when creating an image, I usually get too accustomed
> to my own creation, and don't really see how well I'm doing... reversing 
> the image horizontally helps there, as you see the image as if it were a new,
> never seen image. 

Many moons ago I was taught to look photographs upside down. That is the 
photograph is upside down not me standing on my head. ;)

-- 

Best Regards,
	Stephen

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Stephen wrote:

> Many moons ago I was taught to look photographs upside down. 

Like this one? ;)

http://www.moillusions.com/2006/09/margaret-thatcher-illusion.html

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Christian Froeschlin wrote:
> Stephen wrote:
> 
>> Many moons ago I was taught to look photographs upside down. 
> 
> Like this one? ;)
> 
> http://www.moillusions.com/2006/09/margaret-thatcher-illusion.html

Yes and no. looking at the modified, upside photo, it only takes a 
second or two for the mouth and eyes to jump out at you as being 

No, because the images are too small to look at properly. I had been 
thinking of seeing dust marks, hairs and scratches on the negatives that 
were reproduced on the positives.
Well found though :D


-- 

Best Regards,
	Stephen

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"Stephen" <mca### [at] aolDOTcom> schreef in bericht 
news:4b294423$1@news.povray.org...
>
> And write a tutorial? :twisted:

Well, there starts to be a need for some tutorials indeed.  :)
Did I promise one? I have a number of notes that should be turned into a 
tutorial. Maybe Christmas will be a good time to round that up...

Thomas

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"Stephen" <mca### [at] aolDOTcom> schreef in bericht 
news:4b294510$1@news.povray.org...
>
> Many moons ago I was taught to look photographs upside down. That is the 
> photograph is upside down not me standing on my head. ;)


I was on the point of suggesting that technique too.... :)

Thomas

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I have started to play with Ive's skin techniques and come up - for the time 
being - with the following ideas, illustrated by the attached image.

First of all, defining a skin color means that you need to define separate 
basic image_maps for the different skin features, e.g. one for the face 
skin, one for the lips, one for the eye sockets, one for the skull maybe, 
etc, depending on the details you want to show. This is not impossible to do 
using the basic image template but it is a delicate work.

That said, for most purposes, the skin image maps provided by Poser are of 
enough quality for direct use. What is often needed though is a better 
control of the apparent texture of the skin, the gloss, the transparancy. 
This last one could certainly be obtained by SSS but I do not want to go 
into that right now. I think that others are better qualified than me to 
give advice there.

The shininess or gloss of the skin can be improved however quite easily by 
applying a correct finish to the skin texture. You can do this in Poseray, 
by manipulating the finish box in the material section, fine-tuning later in 
POV-Ray itself. Alternatively, you can define your own finish code in 
Poseray or in POV-Ray. Ive's finish code with the SkinOil parameter is very 
interesting for that purpose and I have modified his texture code in order 
to be ablt to fully apply it to the standard skin textures of Poser.

The three images (Poser 8, Alyson figure; morphed to unique facial 
characteristics)  below, all with 16bps png image maps, have the following 
characteristics (only the heads have been modified):

1. Original figure with minimal finish improvements (specular 0.05 roughness 
0.005 for the gloss)

2. A skin material derived fro Ive's have been used, with SkinOil value 
0.01. The code for the texture here is:

//the different image maps:
#declare PP_Head = pigment{p_map4}
#declare S_Head  = pigment{p_map6}
#declare N_Head  = normal {p_map5}

#local N_Face =
normal {
   uv_mapping N_Head
   bump_size 1
}

#local F_Skin_S0 =
finish {
   ambient 0  diffuse 1
   specular 0.01 roughness 0.11
   phong 0.01  phong_size 2
   brilliance 1
}

#local F_Skin_S1 =
finish {
   ambient 0  diffuse 1 - 0.1 * SkinOil
   specular 0.01 + 0.75 * SkinOil roughness 0.06
   phong 0.01 + 0.5 * SkinOil  phong_size 5
   metallic 0.4 brilliance 1.05
}

#local T_Head_S0 =
texture {
   pigment {uv_mapping PP_Head}
   normal {N_Face}
   finish {F_Skin_S0}
}

#local T_Head_S1 =
texture {
   pigment {uv_mapping PP_Head}
   normal {N_Face}
   finish {F_Skin_S1}
}

#local M_Head =
material {
   texture {
     pigment_pattern {uv_mapping S_Head}
     texture_map{
       [0 T_Head_S0]
       [1 T_Head_S1]
     }
   }
}

3. Same as 2 but with SkinOil value 0.1.


The results show that Ive's finish is giving a more natural aspect to the 
face imo.

For the eye's cornea (the transparant outer layer), I use a material I 
developed myself:

#declare F_EyeTrans=
finish {
  specular 1
  roughness 0.001
  ambient 0
  diffuse 0
  reflection 0.05
}

#declare I_EyeTrans =
interior { ior 1.5 }

#declare T_EyeTrans =
texture {
  pigment { rgbf<1.0, 1.0, 1.0, 0.7> }
  finish  { F_EyeTrans }
}
#declare M_EyeTrans =
material {
  texture { T_EyeTrans }
  interior { I_EyeTrans }
}



Thomas

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Attachments:
Download 'PoserFiguretest_comb.jpg' (114 KB)

Preview of image 'PoserFiguretest_comb.jpg'

Thomas de Groot wrote:
> "Stephen" <mca### [at] aolDOTcom> schreef in bericht 
> news:4b294423$1@news.povray.org...
>> And write a tutorial? :twisted:
> 
> Well, there starts to be a need for some tutorials indeed.  :)
> Did I promise one? I have a number of notes that should be turned into a 
> tutorial. Maybe Christmas will be a good time to round that up...
> 

Great Thomas, you have promised now ;)

-- 

Best Regards,
	Stephen

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Thomas de Groot wrote:
> I have started to play with Ive's skin techniques and come up - for the time 
> being - with the following ideas, illustrated by the attached image.
> ...

I'm glad my hastily written explanation full of typos (I was interrupted
multiple times) is already of help. And I'm in a hurry again as we are
going to see the brand new James Cameron movie this evening, I'm already
sooo curious...

-Ive

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Ive escreveu:
> Thomas de Groot wrote:
>> I have started to play with Ive's skin techniques and come up - for 
>> the time being - with the following ideas, illustrated by the attached 
>> image.
>> ...
> 
> I'm glad my hastily written explanation full of typos (I was interrupted
> multiple times) is already of help. And I'm in a hurry again as we are
> going to see the brand new James Cameron movie this evening, I'm already
> sooo curious...

I take that to mean your next skin texture will be blue? ;)

-- 
a game sig: http://tinyurl.com/d3rxz9

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Really nice to see more people characters being used in Povray! Always great.

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