Tracing method

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djegoo
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Tracing method

Post by djegoo » Thu Oct 15, 2009 11:19 pm

heylow!

i am testing the new materials wax and orange juice in the skindigo preset materials, but i don t know which way fits better? because when i watch in the forum it seems that noone uses the same so i m a bit lost :(

so my question is : for this Wax sss material, which way is the more suitable? PT?MLT? and bidir? or not bidir? or is it the same and i choose what i prefer?

i rarely render with such cmplex materials but i would like to!!
here are ma tests
Attachments
im1255546616.png
this is simple PT, really fast 2 hours i think but see the fireflies :(
im1255546616.png (1.04 MiB) Viewed 3850 times
im1255477380.png
this is 16hours of bidit mlt. the reslut is cool but still at 900sample/pixel:!:
im1255477380.png (866.59 KiB) Viewed 3851 times

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PureSpider
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Re: Tracing method

Post by PureSpider » Thu Oct 15, 2009 11:27 pm

For SSS i'd go for MLT (with or without BiDir) cause the rays paths in SSS are rather complex.
I think MLT is best here... correct me if I'm wrong :)

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djegoo
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Re: Tracing method

Post by djegoo » Thu Oct 15, 2009 11:34 pm

cool thanks, it is what intuitionally i would have chosen, but it is sooo long! but i guess it is normal.

the horse on this scene is 10cm big, this is why i think on his legs it has caustics since it is maybe something like 5millimeter thin. i was a bit surprised becaus wax rarely do caustics in real life, but at this scale i think it is normal.

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djegoo
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Re: Tracing method

Post by djegoo » Fri Oct 16, 2009 12:53 am

haha purespider you re the man!
here it is at 19 minute, only simple mlt.
hope this post will help others newbinoobs like me who don t always know which method fits better to each situation :D
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mlt 19minute 175 sample.png
mlt 19minute 175 sample.png (1.17 MiB) Viewed 3805 times

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CTZn
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Re: Tracing method

Post by CTZn » Fri Oct 16, 2009 3:47 am

Not sure that's a tip, but when using backwards PT alone activating hybrid may help reducing nuked pixels a bit...

e: myself am bound to empirical use of rendering settings :/
obsolete asset

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djegoo
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Re: Tracing method

Post by djegoo » Fri Oct 16, 2009 5:20 am

here it is after 4 hours of rendering. soo fast, but te caustics at the legs aren there.

CTzn : ok, i ll try this, haven t had time yet. Your post makes me feel less ashame to render and stop and try another render method to see if it is better or not and the restart again, and etc... :D


PS: i like lmy little horsie!so cute! think i ll use it to preview my materials :p if anyone wants it too, tell me.
Attachments
mlt4h442300 sample.png
mlt4h442300 sample.png (818.96 KiB) Viewed 3719 times

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CTZn
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Re: Tracing method

Post by CTZn » Sat Oct 17, 2009 8:08 am

Your post makes me feel less ashame to render and stop and try another render method to see if it is better or not and the restart again, and etc...
There is no reason to feel ashamed at all, if you are inclined to dig into the topic just go for it, I did that a lot and still was some days ago :)

I can see a few reasons why sampling methods are not exposed much:

- First and above all, it's easy to screw'em up and complain all over the planet about how terrible were your results with Indigo. Newbies happen... Indeed they can be used for the good;) or for the bad.

- Their response is scene dependent. Most often the Indigo factory settings will do great, sometimes tweaks may help.

- Not many people are understanding them fully (and I'm not amongst them). I for one believe that it would be usefull to have the concepts beneath exposed trivially, since sampling methods are tools that may be used at some point for a good purpose.
obsolete asset

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djegoo
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Joined: Thu Jul 16, 2009 10:19 pm

Re: Tracing method

Post by djegoo » Sat Oct 17, 2009 10:05 pm

YES. It is extremely scene dependant. this is my biggest difficulty, but i m sure it is the big advantage of indigo : having the choice.

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