|05 May 2013||#1|
Join Date: May 2013
Shading lesson. Wet asphalt in Vray and 3ds max
I create wet asphalt shader. It's my first serious experince and I want to ask you for evaluation of my work, what I did right and waht I did wrong. I apologize for wrong renders, my machine is very weak...
This is the test scene - https://www.dropbox.com/s/s3l0r3xs3tdiwh6/Studio.zip
This is one of renders - http://www.render.ru/forum/images/upload/3104025.jpg (the white spot is a vray light on the back)
This is the scheme of setup http://www.render.ru/forum/images/upload/3104022.jpg
First I want to ask - is my approach correct? I try to use just a few procedural maps and apply adjustment to them as needed. Is this good? Does this approach decreases or increases render time and quality, may be better to use pitmaps, and get rid of color correction nodes? Sorry for (maybe) stupid questions, there's a lot information about basics and advanced technics, but just a few examples of complex shading. Will it flicker if use it in animation? I can't verify it...
Also there's a problem. When I was really close to result I needed I noticed huge trouble - this material does not work correct with VraySun for some reason. Instead of light spot I recive white overbrighted pixels.
There's a lot of topicts about this problem, I tried everything I could. Only Sub-pixel mapping and Clamp otput help, but when they are on the reflection of the Sun dissapperars at all. How to solve it? Why does this problem appears?
I have one more thing to ask. When Fresnel reflections is locked (I still don't know what vray does when it's locked) in Material editor I can see shader like it will look in rendered image. When I unlock fresnel reflection material starts to reflect background in unusual and very strange way, you just can't understand how it will look on render. Is this normal?
Also when I use fresnel reflection a strange artifacts appear, like a pothole or a gap. It increases as I increase IOR. It also can't be produced by geometry or maps. What is this?
I hope you'll answer me, I tired to try to solve this issues so much, a few days already, and no results, just new problems...
Sorry for bad English, I'm not a native speaker.
|05 May 2013||#2|
Join Date: Feb 2004
You're working on too many things at once. Try to work on it 1 aspect at a time.
First I would try to get the pattern right. And just the pattern. From your render I can't tell if the pattern looks right, there are too many distractions (and it certainly doesn't look like asphalt right now.)
Turn off reflection, render straight from above to get it looking something like this
Next you'd want to get the bump and displacement right. Reflection and fresnel would come way after that.
|05 May 2013||#3|
Join Date: Apr 2011
About that, I think I could be interested to know more about your shading workflow.. if you don't mind. When you work shading, what are your steps?
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