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Don't ask me why, but I've been a bit caught up trying to get a decent grape thing happening...........these are the current multilight tests:



the SSS is ABS 0.01 and Scat is 0.99...........please what am I doing wrong here anyone?
There's transmission, dispersion is 'on' and Nd is 1.42....
If I can nail the sub-surface I can finally move onto the mapping!

Those are too transparent. I think they should be more diffuse on surface and sss needs more absorption. And some seeds inside would do well to realism.

Good luck.

A bad reference image:

Hey Glebe. Its looking promising mate, but as Fernando said, somethings off. It might just be that there's no mapping yet - its been a while since I studied grapes to be fair

I found this link though, and thought it might be of interest. Its a really good Mental Ray SSS tutorial from Gnomon, all about grapes! You might be able to compare....something, or use it.....in some way

http://forums.cgsociety.org/showthread.php?t=399493

Cheers,
Dr Merman

Stuart, ... let's make wine!

I think you've taken on a particularly difficult challenge here.. If you think accurately about the composition of a grape, ..we'd have 3 areas of density. It goes from a denser interior and fades to something lighter near the skin and of course the skin itself. I believe you've come nearly as close as you can in trying to nail it all in one shot.

I guess what I'm basically saying is that perhaps this would ideally be treated as 2 objects, ...but maybe that's a bit messy. and of course, ...maybe I'm wrong as hell.

I'd say just map it and see what you get.

A reference shot I found for you.

Hey thanks guys, really appreciate the input.

Fernando, yes I'll ramp the absorbtion [for the inner core] and yeah, seeds would be a worthwhile addition.
Matt, really appreciate that Gnomon link, Gonna see what ideas I can nick from it.
Chris, Yes maybe I'll just have a glass or two and forget the render! But yes, you're right mate, two objects minimum [for the 'pedantic' mxm] and just the map for the deadline.

Guys, you're all great.

How's it going glebe digital?

Any luck with the grapes?

blueplanetdesign wrote:
Any luck with the grapes?

or has it all turned to wine?

Yeah it soured!
still on my to-do list, but such is the life of a freelancer..........

I am working on a material with similar properties. And i haven't got the results i expected until i added another channel with sss off, where you should work with transmission. I would suggest to add a 20% weighted layer, whose transmission channel could be a very saturated and bright warm green, with a short absorption distance. Set the reflections to a low value of brightness (not to interact too much with the behaviour of the external surface) and set the roughness to 20 or so. This way you should get a more vivid and bright colour. At least, this worked for me even if the material is slightly different (jelly)

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Anyway, i would move this topic into the MXM section, the A-team guys are quick, kind and exhaustive. Tom and Thomas, thanx again for help.

Thanks Mattia, those are great tips for when/if I get back to this.
Great crocs BTW.......

these are indeed great crocs.... hehe