Hi,

who can consult me? I want to create a scene named "The Magnificent men in 
their Flying Machines", which contains a number of wicked airplanes and 
want-to-be-airplanes. Most of them have canvas over the wooden framework.

While I have already a graphic file I can use for the canvas texture, I am 
still in need of some consulting: the cancvas you get to see on vintage 
airplanes is slightly transluscent, means, if you see such an airplane in 
the air and you're below it, through the sunlight you can get an idea of the 
wooden framework below the canvas. I need your advices how best to achieve 
such an effect. To make it even a bit more difficult, the canvas seems to 
blur the edges of the wooden framwork below it, in its slightly transluscent 
effect. How to achieve that little blur effect?

Thanks,

Sven

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Sven Littkowski napsal(a):
> Hi,
> 
> who can consult me? I want to create a scene named "The Magnificent men in 
> their Flying Machines", which contains a number of wicked airplanes and 
> want-to-be-airplanes. Most of them have canvas over the wooden framework.
> 
> While I have already a graphic file I can use for the canvas texture, I am 
> still in need of some consulting: the cancvas you get to see on vintage 
> airplanes is slightly transluscent, means, if you see such an airplane in 
> the air and you're below it, through the sunlight you can get an idea of the 
> wooden framework below the canvas. I need your advices how best to achieve 
> such an effect. To make it even a bit more difficult, the canvas seems to 
> blur the edges of the wooden framwork below it, in its slightly transluscent 
> effect. How to achieve that little blur effect?
> 
> Thanks,
> 
> Sven 
> 
> 
use a blurred refraction:
-make it solid
-give it IOR
-use multiple pigment{Clear} normal{bumps} layers
-add the canvas itself

It's slow but it might work

Post a reply to this message

Jan Dvorak nous apporta ses lumieres en ce 2008/02/19 07:39:
> Sven Littkowski napsal(a):
>> Hi,
>>
>> who can consult me? I want to create a scene named "The Magnificent 
>> men in their Flying Machines", which contains a number of wicked 
>> airplanes and want-to-be-airplanes. Most of them have canvas over the 
>> wooden framework.
>>
>> While I have already a graphic file I can use for the canvas texture, 
>> I am still in need of some consulting: the cancvas you get to see on 
>> vintage airplanes is slightly transluscent, means, if you see such an 
>> airplane in the air and you're below it, through the sunlight you can 
>> get an idea of the wooden framework below the canvas. I need your 
>> advices how best to achieve such an effect. To make it even a bit more 
>> difficult, the canvas seems to blur the edges of the wooden framwork 
>> below it, in its slightly transluscent effect. How to achieve that 
>> little blur effect?
>>
>> Thanks,
>>
>> Sven
>>
> use a blurred refraction:
> -make it solid
> -give it IOR
> -use multiple pigment{Clear} normal{bumps} layers
Don't use to many, each ray will be affected by two surfaces.
> -add the canvas itself
> 
> It's slow but it might work


-- 
Alain
-------------------------------------------------
But I thought YOU did the backups...

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Thanks, Jan and Alain! I appreciate your help a lot!

I use POV-Ray since around 1993 or so. Long time. But I used, up to now, 
only relatively simple techniques. I would like to ask you two to give me 
some sample code for a basic box, which should have these attributes. The 
reason is, I was reading your suggestions but still don't know, how to 
follow them up.

Let it be a thin sample box, resembling some canvas:

box
{
 < 0.0, 0.0, 0.0 > < 0.0, 0.0, 0.0 >
 ...
}

Let's assume the the name for the canvas texture graphic file would be 
"Canvas.png".

Thanks for your help again,

Sven





"Sven Littkowski" <sven [] jamaica-focus [] com> schrieb im Newsbeitrag 
news:47baa43d$1@news.povray.org...
> Hi,
>
> who can consult me? I want to create a scene named "The Magnificent men in 
> their Flying Machines", which contains a number of wicked airplanes and 
> want-to-be-airplanes. Most of them have canvas over the wooden framework.
>
> While I have already a graphic file I can use for the canvas texture, I am 
> still in need of some consulting: the cancvas you get to see on vintage 
> airplanes is slightly transluscent, means, if you see such an airplane in 
> the air and you're below it, through the sunlight you can get an idea of 
> the wooden framework below the canvas. I need your advices how best to 
> achieve such an effect. To make it even a bit more difficult, the canvas 
> seems to blur the edges of the wooden framwork below it, in its slightly 
> transluscent effect. How to achieve that little blur effect?
>
> Thanks,
>
> Sven
>

Post a reply to this message

Sven Littkowski escribió:
> Let it be a thin sample box, resembling some canvas:
> 
> box
> {
>  < 0.0, 0.0, 0.0 > < 0.0, 0.0, 0.0 >
>  ...
 > }

That is a zero-sized box. An invisible point.

Post a reply to this message

Thanks, Jan, Nicolas and Alain! I appreciate your help a lot!

I use POV-Ray since around 1993 or so. Long time. But I used, up to now,
only relatively simple techniques. I would like to ask you two to give me
some sample code for a basic box, which should have these attributes. The
reason is, I was reading your suggestions but still don't know, how to
follow them up.

Let it be a thin sample box, resembling some canvas (corrected version):

box
{
 < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
 ...
}

Let's assume the the name for the canvas texture graphic file would be
"Canvas.png".

Thanks for your help again,

Sven

Post a reply to this message

Sven Littkowski napsal(a):
> Thanks, Jan, Nicolas and Alain! I appreciate your help a lot!
> 
> I use POV-Ray since around 1993 or so. Long time. But I used, up to now,
> only relatively simple techniques. I would like to ask you two to give me
> some sample code for a basic box, which should have these attributes. The
> reason is, I was reading your suggestions but still don't know, how to
> follow them up.
> 
> Let it be a thin sample box, resembling some canvas (corrected version):
> 
> box
> {
>  < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
>  ...
> }
> 
> Let's assume the the name for the canvas texture graphic file would be
> "Canvas.png".
> 
> Thanks for your help again,
> 
> Sven
> 
> 
> 
see http://tag.povray.org/povQandT/languageQandT.html#blurredreflection
I haven't tried it myself but I could if you want me to.

Post a reply to this message

>> -use multiple pigment{Clear} normal{bumps} layers
> Don't use to many, each ray will be affected by two surfaces.
to be exact, the times don't add up. they multiply.

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Jan, it might be I have to ask you to give me a sample canvas. I was reading 
the link you provided, but this all sounds a bit Chinese to me. I never used 
those techniques before, not even the NORMAL feature.

All I know is, that I would go for the small scale (0.001), since I need a 
high antialiasing and a high speed.

Thanks a lot, I appreciate your help very much! Shall I name one of these 
wicked vintage airplanes with your name?

Here the canvas box and a thin wooden board behind.

box
{
  < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
  ...
}

box
{
  < -10.0, -0.025, 0.005 > < 10.0, 0.025, 0.055 >
  ...
}

Greetings,

Sven






"Jan Dvorak" <jan### [at] centrumcz> schrieb im Newsbeitrag 
news:47bb4f1f@news.povray.org...
> Sven Littkowski napsal(a):
>> Thanks, Jan, Nicolas and Alain! I appreciate your help a lot!
>>
>> I use POV-Ray since around 1993 or so. Long time. But I used, up to now,
>> only relatively simple techniques. I would like to ask you two to give me
>> some sample code for a basic box, which should have these attributes. The
>> reason is, I was reading your suggestions but still don't know, how to
>> follow them up.
>>
>> Let it be a thin sample box, resembling some canvas (corrected version):
>>
>> box
>> {
>>  < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
>>  ...
>> }
>>
>> Let's assume the the name for the canvas texture graphic file would be
>> "Canvas.png".
>>
>> Thanks for your help again,
>>
>> Sven
>>
>>
>>
> see http://tag.povray.org/povQandT/languageQandT.html#blurredreflection
> I haven't tried it myself but I could if you want me to.

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Correction: here it is again. Just the upper box needs to be modified.

box   // Canvas
{
  < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
  ...
}

box   // Wooden Frame
{
  < -10.0, -0.025, 0.005 > < 10.0, 0.025, 0.055 >
 pigment {  Brown }
}

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