Margus Ramst wrote:
> 
> Here's a little scene to demonstrate using media to simulate translucency
> (diffuse transmission). Dont' tell me the wallpaper, table etc. suck. I know
> and right now I don't care. Just concentrate your gaze upon the lamp shade
> and tell me what you think.

The table mearly sucks. The wall paper sucks immaculate. I will let it go
since it is a proof of concept image.
 
> I had to use very dense media to get only diffuse light transmission (rgb
> 1500). This posed a bit of a problem, understandable when you read my post
> about media_interaction (in .general). So there are actually 2 lamp shades:
> one, the media container, with a clear filter and no_shadow to avoid the
> shadow of the media (which would be nearly opaque in this scene); and
> another, slightly thicker, using a yellowish filter to create the shadow you
> see.
> 
> In the process, I encountered other quirks. Using a area light changes the
> appearance of the media radically (much brighter and horribly grainy). Using
> transmit also makes the media very grainy. I'm still exploring these
> problems.
> 
> Margus


Hi Margus,

  I think you are on the right track if media is the choice you
prefer to model translucency with. I still think there are other
alternatives but I am not going to say what until I get a chance
to test my own theories. Your rgb values sound a bit whacko and
I don't understand why you would have to go so high with them.
In this business whatever works I suppose.


Ken's tip of the week:

   An interesting thing happens to media used inside a container if you
add an ior value to the interior statement that also contains the density
statement. I don't understand exactly what happens but it has a tendency
to polarize(?) the grain structure of the media providing a somewhat
smoother appearance. It might be worth trying with the media in this model
to see how different it is and if it behaves better or worse. I tried this
with a color list patterns study I did about a month ago and there was a
noticeable difference in how the density appeared. In the case of where I
used it the difference was better as it both smoothed the density of the
media as well as giving it better visibility in the lighting conditions
that were used.
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 Have a nice day :)

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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