Challenge 02: Candy

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dvtwestende

Im in!

juliencrochet

Cool idea ! Can we use some geometry scattering (sugar grains for exemples) or should we restrict to strictly applying a shader?

zeno

I think restricting people in techniques would be counter productive. As long as you consider it's feasible in a production setting, go for it! To clear up the difference: Imagine we'd do some rust material, with chipped paint on top. In that case I don't think it would be right to go off and sculpt a chipped paint layer just for this shader. However, random scattering of objects on another mesh is a scaleable technique that can be applied to many different objects, so I think that would be a valid approach.

lbatek

hi guys, so here is my wip for now....still a lot of issues but presentable wip I guess, not sure if I have time tommorrow so rather sending right now a bit of description: using MtoA and alSurfaces, hdri is a bit darker than refer image +0.5 EV improves it a lot...used rayswitch for combining solid/caustic shadowing using another self emmissive alsurface for diffuse rays and shadow wip 1

muhammet

hi this is gonne be my first attempt to your challenges (or any online challenge really). I was wondering if i can alter the colors or do i have to stick with the ref image ?

kayvonlanthen

well, this is the challenge as well. in production you get a reference image and you have to create this image. anything else is pesonal touch in my opinion. if you have a reference you should recreate it as close as possible hope that helps

muhammet

Yes it does help. Thank you.

kayvonlanthen

im thinking about a way to displace those sugar grains. any ideas? how would it be done in production if adding geo is not an option? can this be done with displacement. isnt that a bit overkill with subdivisions? just thinking about this stuff

muhammet

i don't think high subdiv displacement an overkill these days. ofc it depends on what kind of rendererÂ you're gonna use but Redshift and Arnold are tottaly fine with it IMO. An other option could be generating some geo and baking a normal map but thats not gonna work for a close up object of coure. It's a fair balance i think.

kayvonlanthen

hmm overall i think you get away with fairly low subdivision count. with that low value, i think, you dont get away for creating those fine grains of sugar hmmmm tricky indeed. sure vray and other rederers are fine with those values but i would want to optimize my render and only render what i need. do i create extra geo or bump up the subdivisions in order to get those fine details, is the question on my mind i recently started playing around with vray displacement, so i never did those crazy fine details. also i think you would need a 32bit heightmap from the "original" sculpt, which we dont have. we could look up jpeg(lossy) or png (lossless) pictures, but those 8bit/16bit formats lack detail i think. im looking forward on how you guys tackle it

olemarius

Hi! Here's my WIP done in Redshift for C4D. It's a challenging material for sure edit: Thanks @juliencrochet and @tharlevfx ! My material is really not very complicated. I don't think you need a lot of nodes to recreate it, but all your values need to be spot on. My WIP is a refractive single scatter material driven by vertex color and noises. I think the key is finding the balance between extinction,scattering and the phase. I'm struggling to get the shadows opaque enough while still retaining enough translucency. I may have to find a way to cheat that somehow.

Also, right now all three share the same material (to keep editing faster), but I'll probably have to split them up to fine tune them later. The sugar is created using scattered platonic geometry, and the surface itself is displaced by cell noises.

WIP

tharlevfx

looking sweet olemarius How did you do the grains? Just displacement cos they're looking really nice. Think thats going to be the hardest part to get working in realtime.

juliencrochet

@zeno Alright, thank you ! @olemarius Your WIP looks great ! Can you share some more about how you've done it?

lbatek

@olemarius ...so good man! you pretty nail it from start, esp those sugar chunks are perfect! thanks for kicking my butt so badly, feel like complete noob hehe...getting back to drawingboard ...next time should think twice before sending anything hehe I m pretty motivated right now keep em comming guys

tomhlfld

Hi Guys, this is my current WIP state. I started with the shader of one candy and my final step will be the recreation of the shader for the different colors/candys. I will update this post here with a more detailed explanation when it's really done I made this with C4D and C4DtoA. The one of @olemarius looks great already!

--- LATESTMade a second try withe the new "uber shader" of Arnold 5:

lbatek

another progress pic v02, using MtoA...I guess if not last I ve started to hate this candy, so I guess I need some rest from it ...thinking of trying version 03 without scattered sugar particles just displace and procedural tex for everything ...not sure tho beauty straight from arnold and heres s displaced geo if someone interested lighting aov with displaced geo short info: straight from MtoA no post, I ve tweaked a bit interpenetrating geometry because of shading issues from that (that laying whiteRed on the yellow) all 3 candies together in one alsurface for easy tunning...some time spent to handpaint image masks for those color areas on them...biggest problem was scattering component of the shader...using the attenuation params in transmission part of the shader for single scatter. Basically theres not much info about the way algorithm works nor how to properly use it - correct me if I wrong (speaking of normal end user... I know you coding guys probably know everything about that I ve used some scattered geos for sugar on top of it. Still lot of improvement here and there needed...nothing is perfect as always Cheers guys! Nice work by the way... Libor

arthurgatineau

shaderxyz_2_candy shaderxyz_2_candy_100percent

I didn't have time for the first one but I motivated myself the other night to make this one. I tweaked the candy on the left ( position and inflate a bit ) so it matches a bit more the reference. Broad displacement for silouhette variation, and other layers for the surface detail ( all the displacement made with SigerNoise https://www.sigershop.eu/free-3ds-max-plugins/sigertexmaps-sigernoise/ ) Diffuse painted in mari, VRayMtl with refraction,refraction glossiness, SSS and slightly tinded spec map ( tweaked diffuse map) . Another VRayMtl with less refraction for the white part of the yellow candy ( seems more opaque to me ). I scattered 2 types of grains, some opaques ones and others with refractions ( with random values for scale etc of course ). Chromatic aberration in photoshop (Lens effects in Vray )

kayvonlanthen

@arthurgatineau @lbatek nice displacement, both of you. though your (@lbatek) candy is a tad too dark i think. maybe brighten it up a bit more

lbatek

@kayvonlanthen yeah you are right, I was a bit worried to not overdo it (brighten too much) - will work on that soon. I must say that @olemarius version is still damn good! its not the same as reference image but has the candy tastiness or how to say it! I would call it "hyperreal" in advert style - not mimic reality but overtake it, and those sugar particles simply rocks! I would need to spend more time on them too using instancing/particles or new Mash in 2017 to experiment instantly, now Im using old "spPaint" script to paint geos manually...still rocks btw Im really curious what everyone else come up with! esp using MtoA , considering transmission properties of that thingy....

pannekaka

Here's my take on the challenge! software used: C4D with Redshift Light Challenge And here is my displacement i generated in Photoshop