[Radiance-general] modeling trees in Radiance

[Germán Molina Larrain]

Ok, so I can think of two ways... one sort of show "random leaves", and the
other is just continuous. HERE
<https://drive.google.com/open?id=0B2NfkTSl19hQNjZUOGZzTkZSTjA&authuser=0>
is a picture of both. I guess the one that shows leaves is better, and
allows more interesting stuff... also, since it is random, I assume its is
also more realistic.

HERE IS THE FOLDER
<https://drive.google.com/open?id=0B2NfkTSl19hQVHpKSmFRSFdNcXc&authuser=0>
with the files... just run the "run" file, and you will get everyting done.

Best,

Germán



2015-02-06 5:55 GMT-03:00 Joe Smith <the.oat.cracker at gmail.com>:

> Dear all, thank you very much!
>
> To Greg: May I ask, if I also want to consider reflection or scattering of
> the sphere surface, how should I specify the parameters for the trans type
> of material? and what does the "trans" parameter for trans material means?
>
> To German: Thank you for the tip of using a mixfunc! Can you advise on how
> to specify the funcfile to define the pattern and proportion of mixing of
> void and plastic materials?
>
> To Compagnon: Thank you for the square-root reminder!
>
> To Christopher and Greg: Thanks for the tip on mist! Can we imagine the
> tree object modeled in this way as a hollowed sphere whose surface is
> composed of a texture with an "alternating void and plastic" pattern, and
> the inside of the sphere is filled with a lump of "mysterious" fog ...?
>
>
> On Fri, Feb 6, 2015 at 8:14 AM, Greg Ward <gregoryjward at gmail.com> wrote:
>
>> Yes, I should have thought about the square root -- good catch!
>>
>> The trans type doesn't change with incident angle (unlike glass or
>> dielectric), which is part of why I suggested it.  I don't know what's
>> happening in Germán's case, but using a mixfunc with void and plastic is a
>> perfectly acceptable approach.
>>
>> As for varying the absorption using mist, a ball of mist might indeed
>> have the desired behavior, as the absorption is an exponential function of
>> the volume traversed using the mist material.
>>
>> Cheers,
>> -Greg
>>
>> *From: *Christopher Rush <Christopher.Rush at arup.com>
>>
>> *Subject: *Re: [Radiance-general] modeling trees in Radiance
>>
>> *Date: *February 5, 2015 7:05:02 AM PST
>>
>>
>>    I see Raphaël just pointed out what I was in the middle of typing
>> about the square root transmittance correction. Also, keep in mind this
>> will only be a very rough approximation for any measurements very near the
>> tree, where rays passing through all parts of the tree get the same
>> reduction even if they just glance the fringe of the sphere or other shape.
>> In reality, rays passing through the outer fringes of a tree canopy would
>> intersect with fewer leaves than those passing through the more substantial
>> core of the tree (also depending on tree species).
>>
>> I would love to here if anyone has a more ideal solution for modeling
>> trees that is relatively accurate, and reasonable in terms of rendering
>> time and use of RAM – in other words without modeling every single leaf. If
>> it looked nice that would be a bonus. Is this a possible application for
>> something exotic like mist? I’ve never even investigated mist so apologies
>> if that’s a ridiculous suggestion.
>>
>>
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