Tim McMurdo nous apporta ses lumieres ainsi en ce 2004-12-08 15:33... :

>I have finally gotten to the point where I can create a decent media cloud.
>What I want is a single cloud with  a column of rain coming from underneath
>it.
>
>The problems I am facing:
>
>1. Due to the turbulance of the media, I never know how big the cloud will
>be inside of the container. So what should the diameter of my rain column
>be so that if fits the size of the media cloud and not the media container?
>
>2. I don't know exactly where the media cloud shows up inside of the media
>container, so how do I insure that the rain column is under an acutal cloud
>and not just under the media container?
>
>3. I am thinking of using media for the column of rain. So, won't I have
>problems with overlapping media containers?
>
>I would welcome any suggestions including...am I even heading in the right
>direction? Is there a better approach?
>
>Thanks for any help you can give me,
>
>Tim
>
Your 2 containers will inevitably overlap. The rain column is never as 
large as the cloud it originate from, and actualy start inside the 
cloud. Make the rain container reatch inside the cloud and adjust it's 
horizontal size by trial and error. Between two renders, the turbulance 
will remain the same, so will the shape of the cloud. If you need to 
move it around, do the translation *after* the media is applied, this 
will preserve the shape.
You can merge both containers, just use a cylindrical pattern for the 
rain with a dencity_map that is mostly constant everywhere and drop 
sharply near the zero value (1 at the center, 0 at 1 unit radius scale 
it as needed).

Alain

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