Corona Renderer Forum

General Category => I need help => Topic started by: zules on 2018-03-26, 11:25:23

Title: Real Snow shader
Post by: zules on 2018-03-26, 11:25:23
Hi !
I'm trying to re create this shader, made into Maya...

I'm working with 3DSMAX & Corona, and can't get the same result, just the step 2....

Any idea to get the 3 last steps working ? With Max procedural maps of course ;)
Title: Re: Real Snow shader
Post by: maru on 2018-03-26, 14:27:39
Looks like the only thing needed here is the noise map.
All the rest also seems perfectly possible to do in Corona + 3ds Max.
They used the displacement noise map to drive reflectivity (so that the small sparkles appear). You can do the same thing using a layered mtl (another layer of reflective material, then masked with the noise map) or by just mapping the reflection glossiness.
Title: Re: Real Snow shader
Post by: gpz on 2018-03-26, 14:52:58
can you post your result and also a screenshot of your material set up in slatemode?

thx
Title: Re: Real Snow shader
Post by: NicolasC on 2018-03-26, 15:36:12
Ludvik made a pretty nice one here some time ago: https://corona-renderer.com/forum/index.php?topic=9691.0 (https://corona-renderer.com/forum/index.php?topic=9691.0)
Title: Re: Real Snow shader
Post by: zules on 2018-03-26, 19:13:34
can you post your result and also a screenshot of your material set up in slatemode?

thx

hey guys !

Actually, just a simple noise map in displacement slot, and some volumetric scattering.
It does the job pretty good, even in long distance. It uses 16 Gb of RAM in 4K x 3K rendering.

I will lokk tho nico's link, it looks badass ! :)
Title: Re: Real Snow shader
Post by: Christa Noel on 2018-03-27, 05:12:05
sorry, a little bit off-topic. Maru, do you have a plan to add snow material and some of related mtls (sand) to Corona Material Library?
Title: Re: Real Snow shader
Post by: zules on 2018-03-27, 11:46:05
Ludvik made a pretty nice one here some time ago: https://corona-renderer.com/forum/index.php?topic=9691.0 (https://corona-renderer.com/forum/index.php?topic=9691.0)

Ok great for this shader, except I want to do it full procedural with max or Bercon maps...

Main problem is to get an efficient very fine noise map. I also tried with Speckle one, but it doesnt work.
When Main large noise (my example) is mixed with a tiny one, it take over the large one even when playing with the High and Low parameters...
Title: Re: Real Snow shader
Post by: Eddoron on 2018-03-28, 06:33:49
The skin shader seems to be a really good choice for this as it comes closest to the Arnold standard shader. Multiple spec channels and direct control of color lengths.

edd: did a quick test. Some things still have to be adjusted. However, it's much simpler than layering either inside the channels or using the layer shader, + the three scattering options are pretty good to define the low and high-frequency noises. It's easier to change the look, from icy or powdery to wet while maintaining details that might change too drastically with only one scatter channel.
Title: Re: Real Snow shader
Post by: maru on 2018-03-28, 10:41:27
sorry, a little bit off-topic. Maru, do you have a plan to add snow material and some of related mtls (sand) to Corona Material Library?
I remember there was a plan for the snow material, not sure about sand, but it is a good idea.
Title: Re: Real Snow shader
Post by: zules on 2018-04-03, 11:18:31
The skin shader seems to be a really good choice for this as it comes closest to the Arnold standard shader. Multiple spec channels and direct control of color lengths.

edd: did a quick test. Some things still have to be adjusted. However, it's much simpler than layering either inside the channels or using the layer shader, + the three scattering options are pretty good to define the low and high-frequency noises. It's easier to change the look, from icy or powdery to wet while maintaining details that might change too drastically with only one scatter channel.

Hi ! Can you share it plz ? :)