Challenge 01: Snow

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mikiramos

@cesco Really good job! One of the best!

raju

Hi All, Today I have tested .my first render

kayvonlanthen

great stuff in here question: do i need to degamma the hdr in maya? can i just use the srgb color profile within the file node? should i switch to raw? raw means its degamma'd?

zeno

@kayvonlanthen, the checker/chart are srgb, hdri is linear (/raw in Maya)

kayvonlanthen

@zeno perfect, thanks setting up my scene as we speak. i really appreciate all the maya users in here. Normally max users doimate the rendering scene, i feel. maybe just me :p

markus

@Thomas Harle nice, curious how UE4 is doing that!

xavier

Hi everyone ! There is already some pretty nice snowball here ! Here is my snow shader : challenge_01_snow_1k_v005 I'm using Arnold and Maya 2016 I tried to keep it really simple so only 1ball, 1shader and rayDepth at 1-1-1-2 For the displacement right now I'm using: -a fractal for large scale variation -a texture that bring some small blocks -a texture that bring some sharper breakup -a fractal for high frequency noise on top For the shader itself : -I added a fractal to make some SSS distance variation to have area more melting/softer than other -a fractal to add some area using transmission for the icy effect (the hard part was to find a good attenuation value to blend properly with the SSS) -some fractal for the small dot and dirt area in diffuse -a fractal to get really high contrast/glint in spec intensity, I didn't used flake because I find that sometime it can be hard to control and make some not wanted effects (glint in shadow area) and the surface is already bumpy so it should glint too in movement -I'm using directional sss with 2 level but 1 might be enough shading_network_snow_v005 It's taking 29min on a 2 x Xeon E5 2670 2.5Â Ghz No post process except defocus For my next submission I will try to remove my 2 displacement textures and make everything procedural I'm pretty excited to see this new shading community growing ! Cheers !

markus

xavier Lafarge wow, thats an amazing good looking shader! Thx for the explanation, great inputs.

tharlevfx

Here's my attempt using Unreal 4 - it's about 240 instructions and using 2 texture inputs - a Clouds Noise and some Dots for the fakeÂ Highlights. Â Had to do some hacks for the Subsurface and Lighting but Render times are about 15ms. Unreal 4 Snow Render Network Project Link if you want to download and have a look at the shader in closer detail: https://www.dropbox.com/sh/87mo6oq5inprea3/AACAqDUjW3_4XQ1Qgh-loV0aa?dl=0Cheers

herbst

I'm gonna continue the realtime rendering part of this - here is my attempt using Unity3D, DX11 tesselation, HDR, faked SSS, screenspace reflections, some ambient occlusion and some depth of field. All in-engine, running on my old Notebook without dedicated graphics card . I didn't get to the "lighting hacks" that Thomas Harle mentioned yet - that's why the right side and bottom look so bright, that's all coming from theÂ IBL. Snow Rendering Shading in ShaderForge, lots of triplanar calculations: ShaderForge Triplanar Snow Shader Aaand a scene view with the Material settings (messy). Material Settings and Scene View Unity3D

pimhendriks

@xavier, that is probably the best one yet. Really good stuff man. Every time I come back to post my own, there's someone getting a better result than I am haha. I can't keep going back to this.. anyway. I'm struggling a bit with the specular response. Setup:

For displacement I'm using 3 layered volume noises (one set to whispy, the other two to combined with 2 cloud nodes with a reduced depth.
Then for color I use 2 stucco's, combined to give off some big dirt stain and light dirt stain.
Roughness, an alFlake to get high frequency data, though I was pretty conservative with that.
I'm feeding in a little bit of transmission for the edges using a sampler info.

arimao

Seems like all the cool kids are doing this now, so I'll chuck in my WIP (procedural, VRay) too.

I still need to add the glossy flakes (it's kind of looking v. dry right now) and some dirt and stuff, and touch up that v. awk displacement map, but you know, not that bad for a couple of hours of lobbing things together. I'm loving all of the amazing Unreal shaders!

Quick snow render

Welp, I think it still needs a ton more work. I'm still not that pleased with the SSS yet, there are parts where it's much too crusty & icy, and I think it's something to do with the transmission depth, but I can't really figure it out yet. Will keep having at it.

[deleted]

Updating, the bug is only slightly visible now.. Are we generally going for physically behaviour like caustics and transmission so penetrating objects look correct?

hendrikkramer

Hey guys, I also played with it for an hour or so. Did it in Arnold for Maya with the alshader library. Regards Hendrik

caiopimentel

Hi guys, here is my snowball until now. I'm using Arnold and alShaders. Maybe I'll still make some adjustments, gonna wait to see it with fresh eyes, and will soon post the details behind it! For some rough breakdown and better quality: https://www.artstation.com/artwork/d6l5A Keep up! Caio

markus

@caiopimentel crazy, looks real! The little breakdown is excelent, very good to understand how you Displacement looks like. Thx! btw, how do you guys do these "@name" thing? My "@name" is so poor

zeno

@caiopimentel - I like your breakdown dude, very helpful to see the displacement like that. Amazing shader too! What's the shader setup for the small icy bits? It seems like there aren't any dark spots like in mine due to it, but I already disabled casting shadows on that geo piece. You are using a duplicated piece of geometry, right?

caiopimentel

Thanks @markus and @zeno ! Nice to know you guys liked the result and that the breakdown was useful! So, I will post the full setup soon, but yes duplicated mesh! I also disabled casting shadows, I'm almost sure about it. The black spots you see are in the SSS pass, and are probably like that because they are been 'calculated only' in the refraction pass (the pass you see 'white' blobs over black). But, I can check it if you like! And dude, what an awesome idea and effort you had putting up this site, I'm psyched about. Cheers!

markus

@caiopimentel yea man, post it would like to understand your setup. why does it look better with two meshes? whats the trick behind that technique?

[deleted]

Lots of cool results here, good job everyone Decided to take a swing at it, Im using C4d and rendering in vray Set up was pretty simple just alot of experimenting. I layered noise for the displacement and then used the new vray 3.4 AlSurface material which was my first time using it. In the the diffuse Map is where I added small dirt spots also using two reflections inside the material. I then layered another material with some specs and flakes for the glimmer effect. Did little post just to get rid of some of the noise left behind. Overall was something fun to play around with while watching some netflix not really satisfied and gonna play some more this week, best of the luck to everyone trying this out!

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