Hi.

Somehow I don't come close to where I want to go. Who can help me?

The series of vintage airplanes of the first hour is all made of convas and 
wood. With the help of Tim Attwood and many others, I created some sort of 
canvas texture. It works if you look from the lightened side onto the 
canvas. But when looking from below, you would expect some transluscent 
light but it is like a big block of shadow. Please see the three pictures I 
have attached, they show my canvas from atop, from below, and a real photo 
of canvas how it actually should be when watching it from below. NOT a plain 
transparency I need. Also, when recognizing structures below the canvas, 
they appear kinda smooth, blurred.

I am not too experienced if it comes to create materials which are 
"light-proof". Therefore, I need your help. Bear in mind, canvas allows to 
recognize, somehow, elements below the canvas, like parts of the wooden 
frame of the airplane. Who can help me to create a light-proof canvas 
material?

Here's the current canvas code:

#declare Wing3 = texture
{
 pigment
 {
  image_map
  {
   png "Canvas.png"
   transmit all 0.15
  }
  rotate 90*x
 }
 normal
 {
  bump_map
  {
   png "canvas.png"
   interpolate 2
  }
  rotate 90*x
  scale 4
 }
 finish { specular 0.3 roughness 0.05 }
}


Plenty thanks!

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Attachments:
Download 'SL Crazy Wings - The Run - Top.jpg' (40 KB) Download 'SL Crazy Wings - The Run - Bottom.jpg' (49 KB) Download 'Sikorsky S-2.jpg' (67 KB)

Preview of image 'SL Crazy Wings - The Run - Top.jpg'

Preview of image 'SL Crazy Wings - The Run - Bottom.jpg'

Preview of image 'Sikorsky S-2.jpg'

Sven Littkowski wrote:
What you are trying for is something of a POV grail.  There is no pat 
solution.  There are
a few other attributes you can play with though.  You can also add 
'filter all' which adds the fabric color to the light 'coming through'. 
  Filter was actually the intended POV answer to translucence I believe. 
  To lighten the undershadow you need to add radiosity and boost the 
diffuse.  If you boost the specular you will also increase the 
difference between the apparent translucence when viewed from the 
lighted side verses the shadowed side.  Finally I also implemented (I 
think) the idea suggested by Jan Dvorak.  By boosting the scale and 
bump_size excessively You can see what he was suggesting you could play 
with.

[Note, for ease of testing I left the image_map in the z plane, applied 
it to a box then rotated the object rather than rotating the image_map 
into the x plane before applying it like you have.  This was tested 
using the radiosity scene template provide in the insert menu.]


#declare Wing3 =
material {

   texture
   {
    pigment
    {
      rgbt 1
    }
    normal
    {  bumps 1
     //bump_map
     //{
     // png "canvas.png"
     // interpolate 2
     // bump_size 2
     //}
     scale <10,1,1>/1000
    }
    rotate z*60
   }
   texture
   {
    pigment
    {
      rgbt 1
    }
    normal
    {  bumps 1
     //bump_map
     //{
     // png "canvas.png"
     // interpolate 2
     // bump_size 2
     //}
     scale <10,1,1>/1000
    }
    rotate z*120
   }
   texture
   {
    pigment
    {
     image_map
     {
      png "Canvas.png"
      transmit all .3
      filter all .4
     }
     scale 4
    }
    normal
    { bumps 1
    // bump_map
    // {
    //  png "canvas.png"
    //  interpolate 2
    //  bump_size 2
    // }
     scale <10,1,1>/1000
    }
    finish {
     diffuse .8
     specular 0.45
     roughness 0.5
    }
   }
   interior { ior 2.5 }
};

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Attachments:
Download '2.jpg' (21 KB)

Preview of image '2.jpg'

The following pictures attached to this posting show the progress with the 
texture, but all the fame goes to Jim Charter who provided my with his very 
useful canvas material.

While this model of a vintage airplane is still incomplete (I am working on 
the proper positioning of the wheels among other things), the canvas 
material is probably nearly the way it could be. The noise on the color is a 
bit too strong, I thing. I welcome your feedbacks!

I am working on a scene resembling the atmosphere at the start location of 
the London-Paris air race in 1911 (movie: "Those Magnificent Men in their 
Flying Machines") and the famous "Round Britain Air Race" in 1911!

Here a link, if you want to see a video of the ORIGINAL air race of 1911!!!
http://youtube.com/watch?v=93UdIgU3_sA

Help welcome for the following related side projects:
- Hangar Constructions (see the movie)
- Large Tents (see movie) for persons
- Large Tents (see movie) as hangars for the smaller airplanes
- Vintage Oldtimer Cars as seen in the movie, from that time: English and 
French cars (due the two possible locations)
- Persons dressed as seen in the movie and in the video clip: standing, 
walking, running, sitting (pioneer pilots), riding etc. Obey the dress code 
of 1911.
- Landscape (with a simplified English village or a simplified castle in the 
distance?)
- other constructins as seen on the air field in the movie

All has to be converted into POV-Ray scene code. 1 meter = 1 POV unit




"Jim Charter" <jrc### [at] msncom> schrieb im Newsbeitrag 
news:47d49b01@news.povray.org...
> Sven Littkowski wrote:
> What you are trying for is something of a POV grail.  There is no pat
> solution.  There are
> a few other attributes you can play with though.  You can also add
> 'filter all' which adds the fabric color to the light 'coming through'.
>  Filter was actually the intended POV answer to translucence I believe.
>  To lighten the undershadow you need to add radiosity and boost the
> diffuse.  If you boost the specular you will also increase the
> difference between the apparent translucence when viewed from the
> lighted side verses the shadowed side.  Finally I also implemented (I
> think) the idea suggested by Jan Dvorak.  By boosting the scale and
> bump_size excessively You can see what he was suggesting you could play
> with.
>
> [Note, for ease of testing I left the image_map in the z plane, applied
> it to a box then rotated the object rather than rotating the image_map
> into the x plane before applying it like you have.  This was tested
> using the radiosity scene template provide in the insert menu.]
>
>
> #declare Wing3 =
> material {
>
>   texture
>   {
>    pigment
>    {
>      rgbt 1
>    }
>    normal
>    {  bumps 1
>     //bump_map
>     //{
>     // png "canvas.png"
>     // interpolate 2
>     // bump_size 2
>     //}
>     scale <10,1,1>/1000
>    }
>    rotate z*60
>   }
>   texture
>   {
>    pigment
>    {
>      rgbt 1
>    }
>    normal
>    {  bumps 1
>     //bump_map
>     //{
>     // png "canvas.png"
>     // interpolate 2
>     // bump_size 2
>     //}
>     scale <10,1,1>/1000
>    }
>    rotate z*120
>   }
>   texture
>   {
>    pigment
>    {
>     image_map
>     {
>      png "Canvas.png"
>      transmit all .3
>      filter all .4
>     }
>     scale 4
>    }
>    normal
>    { bumps 1
>    // bump_map
>    // {
>    //  png "canvas.png"
>    //  interpolate 2
>    //  bump_size 2
>    // }
>     scale <10,1,1>/1000
>    }
>    finish {
>     diffuse .8
>     specular 0.45
>     roughness 0.5
>    }
>   }
>   interior { ior 2.5 }
> };
>
>

Post a reply to this message

Attachments:
Download 'SL Crazy Wings - The Run - Top.jpg' (62 KB) Download 'SL Crazy Wings - The Run - Bottom.jpg' (68 KB)

Preview of image 'SL Crazy Wings - The Run - Top.jpg'

Preview of image 'SL Crazy Wings - The Run - Bottom.jpg'

I am working on a scene resembling the atmosphere at the start location of 
the London-Paris air race in 1911 (movie: "Those Magnificent Men in their 
Flying Machines") and the famous "Round Britain Air Race" in 1911!

Here a link, if you want to see a video of the ORIGINAL air race of 1911!!!
http://youtube.com/watch?v=93UdIgU3_sA

Help welcome for the following related side projects:
- Hangar Constructions (see the movie)
- Large Tents (see movie) for persons
- Large Tents (see movie) as hangars for the smaller airplanes
- Vintage Oldtimer Cars as seen in the movie, from that time: English and 
French cars (due the two possible locations)
- Persons dressed as seen in the movie and in the video clip: standing, 
walking, running, sitting (pioneer pilots), riding etc. Obey the dress code 
of 1911.
- Landscape (with a simplified English village or a simplified castle in the 
distance?)
- other constructins as seen on the air field in the movie

All has to be converted into POV-Ray scene code. 1 meter = 1 POV unit

Post a reply to this message

Update. See the image for the individual vintage air planes of the scene. 
Many more planes to come!

I am working on a scene resembling the atmosphere at the start location of
the London-Paris air race in 1911 (movie: "Those Magnificent Men in their
Flying Machines") and the famous "Round Britain Air Race" in 1911!

Here a link, if you want to see a video of the ORIGINAL air race of 1911!!!
http://youtube.com/watch?v=93UdIgU3_sA

Help welcome for the following related side projects:
- Hangar Constructions (see the movie)
- Large Tents (see movie) for persons
- Large Tents (see movie) as hangars for the smaller airplanes
- Vintage Oldtimer Cars as seen in the movie, from that time: English and 
French cars (due the two possible locations)
- Persons dressed as seen in the movie and in the video clip: standing, 
walking, running, sitting (pioneer pilots), riding etc. Obey the dress code 
of 1911.
- Landscape (with a simplified English village or a simplified castle in the 
distance?)
- other constructins as seen on the air field in the movie

All has to be converted into POV-Ray scene code. 1 meter = 1 POV unit

Post a reply to this message

Attachments:
Download 'SL Crazy Wings - The Run - Sample.jpg' (119 KB)

Preview of image 'SL Crazy Wings - The Run - Sample.jpg'