Maxwell Render | Official public forum

Why is the orange peel so difficult to render ... ???

There's like one that looks decent to me ..... have a look.

http://www.3drender.com/challenges/fruitbowl/index.htm


What is it about fruits in general that makes them so damn tough to pull off in cg .. ??

and which one is it to you?

My guess would be non-uniformity, so it requires very good textures for diffuse and roughness. No apple is perfectly shiny like a metal coa.. oh w8

I though this treadwas going to be about car paint shaders

Anyway, I like #6 the best

I think #7 has the most natural lighting, ..and for a brief moment it can kind of make you think it's real.


hey Adrian, I have a question...

I think that orange peels, like human skin, get a lot of character from the SSS component.

Also like with all other CG the more familiar the subject matter the more difficult to fool the viewer... It's much easier to create convincing spaceships than oranges...

One might think the orange has an SSS component, ...it's not much if it does. I have to believe the X factor must lie somewhere else !

I believe the SSS contributes but is obscured by the strong specular component of the peel and this is spread out due to the surface structure. The shadow areas get a warm orange glow that makes them look so appetizing...

Look at this section to see how transparent the peel really is:
http://www.istockphoto.com/file_closeup ... 82&Lang=en

Peder

Nice points ... ..good illustration pic too....

So, ..with such a strong specular, .. don't you think a very close proximity could be achieved w/out an SSS ... ?

Also: ..because the peel is so dense and without actually slicing an orange and backlighting it, ... I'm not sure how much absorbtion actually occurs, ...it has to be very low.

Just my opinion but I think the difference you see between a close approximation and the real thing can be seen from the images you linked to.

The thing is with this object we know exactly how they should look, after all we have to make a decision -potentially fatally -about wether to eat them or not.

With human skin it's the same. The health (the status of the bloodvessels under the skin) is very important to our social interactions. A healthy partner is vitally important to our genes for reproduction purposes, why do you think the makeup industry is such a huge market...

Peder

tough one to render nicely that orangepeel. So many variables need to be taken into account for it to look good. Some of those examples you linked to Chris look like metaloranges, not the most tasty one's i ever seen.

Also keep in mind most oranges you can buy in the stores have a thin wax cover to make them shiny and protect them during transport so that adds to the shinyness even more.

It's alot like humanskin.. multilayered scattering within the skin itself so stacked layers of SSS with various densities and thicknesses are probably necessary to make them more real looking.

/ Max

Ahhh, ... I think a solid displacement map and a plastic shader and I'm good.

The orange model itself looks like that of one that should have been in the compost a few days before. An orange you would want to eat is not that nubby or shriveled looking.

I think Holger did the best job on the orange and he gets my vote for best overall.

Points will only be given for dumpster oranges.

#4 looks like the virgin mary should appear to the right
#2 gets me craving Jello
#5 looks like the decorative produce you can purchase over the border (mexico)
#6.......again, a holy spirit kind of event
#7 i agree with ivox
#9 makes me want to become strictly carnivor
#10 left the bananas out too long
#13 easy on the grease buddy!!! the orange looks like a krispy creme
#14 electronic

dammit ivox, now i'm going to have to waste some time and download the scene.