Caustics, refraction, glass questions.

[AnubisMe]

Hi all. I am trying to design a perfume bottle and wondering a couple things. Does Corona support caustics yet? And if so how do I go about activating them. Also whats the best way to give glass that thickness look, I am still confused about when to use solid face vs thin faces. Also in vray there was the fog setting in material to change colour settings of say water ect. is there anything like that in corona that I am overlooking?

thanks in advanced.

[Ondra]

hi,
caustics are always there, only sometimes they get clamped. You can set maximal sample intensity to 0 to get unbiased result, but you will probably get some fireflies. There are other algorithms for rendering caustics, but not in public beta, you'll have to wait for alpha 4 (1-2 weeks).

Use solid glass, thin is for windows.

There is absorption parameter in coronamtl working like vray fog

[AnubisMe]

This is about how far I have got playing around with the glass. I am not sure what I am missing so far, but I have seen a lot stronger results in the gallery.

My aim is to make something like this: http://www.jarrold.co.uk/UserData/root/Images/Beauty%20Images/Perfumery/L'Artisan/seville-a-l'aube.jpg

[Polymax]

At this stage, only the GI caustics possible. Use IBL!

[AnubisMe]

IBL? From reading a lot of the posts people seem to mention a lot of things that I have not seen with the Corona render? are they hidden?

[Polymax]

IBL? From reading a lot of the posts people seem to mention a lot of things that I have not seen with the Corona render? are they hidden?

Put HDRI texture in enviroment and no more light.

[AnubisMe]

yeah I already had a HDRI in the scene under Corona environment, so your saying its best not to use Corona lights with HDRI then?

[Polymax]

yes, only HDRI! My work form the gallery, there is only HDRI:
http://forum.corona-renderer.com/index.php?action=dlattach;topic=452.0;attach=1779;image

[AnubisMe]

that looks incredible! Yes that is the type of quality, and look I am going for.

[AnubisMe]

Also I am curious to what you guys use for brushed metal? do you use a high IOR or low?

[Jahman]

high ior + a bit of reflection gloss randomness + brushed bump map + right mult of anisotropy
brushed steel = steel so material ior (reflectance) mostly constant.
my test in attachment

[ecximer]

Jahman, can you show me wire?

[Jahman]

Ecximer, I'll post the result in a new topic some time later
there's my previous steel test. sorry for the img size

[ecximer]

0_o
Very high quality stuff out - well done!
Hdri can share?

[AnubisMe]

Okay, I made some progress. I am still having a hard time getting the glass just right, but even more so I am not sure how I can give the illusion that their is a yellow perfume liquid inside. The Absorption is giving me really strange results when I try it.