"Vladimir" <nomail@nomail> wrote in message
news:web.412f9cde347225dd302903ba0@news.povray.org...
> Is there an easy way to cover everything in your scene with a thin layer
of
> dust. oh and also without taking up huge amounts of memory and slowing the
> render speed down too much- ive been thinkink of trying a mesh with a
> single triangle to take advantage of mesh instantiation(sp?) but is this
> the best answer?
> Thanks
> Peter
>
>

i can't suggest any concrete sollutions, but i'll post a few links. first to
a paper i've been meaning to read about metallic patinas, which can look
sort of like dust, in that it's very thin, and "changes" the finish of the
object it is on.

http://graphics.csail.mit.edu/~dorsey/papers/patina/

one question i have is this, where is your dust? airborne? resting on
objects, if so, does it need a thickness to it?

also, another paper i have read, and have been spinning my wheels on when i
have spare cycles up there is this, which deals with covering everything in
your scene with snow. a dust particle and a snowflake might have some
similar properties, such as how it can manage to get slightly under things
even if the path is blocked from straight above. the problem with the
analogy is that dust rarely is built up to a significant thickness like
snow. so maybe dust-as-snow isn't a reasonable match. still an interesting
read.

website:
http://www.cs.ubc.ca/nest/imager/contributions/fearing/snow/snow.html
paper in pdf:
http://graphics.stanford.edu/courses/cs448-01-spring/papers/fearing.pdf

for fun i just searched "computer modeling and rendering of dust" and came
across a paper that cites the above snow paper and patina paper. so maybe
i'm not too far off. that paper can be found here:
http://www.cse.cuhk.edu.hk/~ttwong/papers/dust/dust.html

off to read it now... i've not yet been able to translate any of these or
other things like them into povray use (most of it is over my head though i
intend to try someday), but i'd be curious if anyone has.

good luck, maybe someone will offer real help :)
ross

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