Hi, guys,

Nowadays I have rendered a scene of raindrops on a leaf surface with Pov-Ray for
windows. And now I get a rendering result which you can see at this web page:
http://cid-ad5320bb5424a20c.skydrive.live.com/self.aspx/raindrop%20rendering/raindrops265.png.
(Sorry for that I can put up an attachment for my first time to this newsgroup)

Generally speacking, this result of raindrop rendering has a long distance from
the realistical appearence. You can see the raindrops on the leaf has an ugly
reflection and they are not transparent enough. However many papermeters of drop
material have been modified several times, but I can't get a satisfying result.

Therefore, here I ask for your help for how to render this scene for a
realistical result? How to set the papemeters for drops meterial?


--------------------------------------------------------------------------------
The following is my parameter setting for drop:

material {
      texture{
           pigment{Clear}
           finish{
                reflection {0.1,0.3}
                conserve_energy
                ambient 0 diffuse 0
                specular 0.8 roughness 1/1000
                  }
       }
       interior {
        ior 1.33
     }
  }

--------------------------------------------------------------------------------

Expect your answer sincerely.

Thank you.

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On 05/27/2010 07:35 AM, Dream wrote:
> material {
>       texture{
>            pigment{Clear}
>            finish{
>                 reflection {0.1,0.3}
>                 conserve_energy
>                 ambient 0 diffuse 0
>                 specular 0.8 roughness 1/1000
>                   }
>        }
>        interior {
>         ior 1.33
>      }
>   }
> 

I think diffuse 0 is part of your problem and perhaps roughness. larger
value for roughness makes the the specular bloom more (wider) and
smaller roughness makes it more like pinpoint. once you get that
straightened out be aware of the problem that co-incident surfaces can
cause.

Post a reply to this message

On 05/27/2010 08:06 AM, Jim Holsenback wrote:

> be aware of the problem that co-incident surfaces can
> cause.
> 

oops ... forgot to add this:
http://wiki.povray.org/content/Knowledgebase:Language_Questions_and_Tips#Topic_20

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On 5/27/2010 7:06 AM, Jim Holsenback wrote:
>
> I think diffuse 0 is part of your problem and perhaps roughness. larger
> value for roughness makes the the specular bloom more (wider) and
> smaller roughness makes it more like pinpoint. once you get that
> straightened out be aware of the problem that co-incident surfaces can
> cause.
>

Coincident surfaces was my first thought as well.  Something else I see 
are the harsh shadows from the raindrops.  A dark shadow underneath the 
raindrop could cause a similar effect.

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Le 27/05/2010 12:35, Dream a écrit :
> Hi, guys,
> 

> Therefore, here I ask for your help for how to render this scene for a
> realistical result? How to set the papemeters for drops meterial?
> 
What about the max trace level (global at scene level) ?

-- 
A: Because it messes up the order in which people normally read text.<br/>
Q: Why is it such a bad thing?<br/>
A: Top-posting.<br/>
Q: What is the most annoying thing on usenet and in e-mail?

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Le_Forgeron <lef### [at] freefr> wrote:
> Le 27/05/2010 12:35, Dream a écrit :
> > Hi, guys,
> >
>
> > Therefore, here I ask for your help for how to render this scene for a
> > realistical result? How to set the papemeters for drops meterial?
> >
> What about the max trace level (global at scene level) ?
>
> --
> A: Because it messes up the order in which people normally read text.<br/>
> Q: Why is it such a bad thing?<br/>
> A: Top-posting.<br/>
> Q: What is the most annoying thing on usenet and in e-mail?

Hi, the max trace level  is 50, and the "reflection" and "refraction" are both
"on".

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Thank you all for your kindly reply.

The problem has been fixed by mainly two adjustment:

1. Make the raindrop nether surface a bit higher than leaf upper surface. Before
this operation I had made a mistake for an opposite direction.

2. Remove the shadow of raindrop.

Thank you all again.

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