ZBrushCentral

materials - little help with wax problems? (pic included)

ZBrush Usage Questions
#1

hi all,
i love the fast results delivered with wax, but im having some problems
picture (i enhanced the wax effect in order to highlight the problems):

  1. even though the dark/red wax area comes out great, the bright white side of the wax comes out more intense than i would like it (keep in mind that the picture above is enhanced and is not accurate)
    in my attempt to keep the dark/red wax area while getting rid of the bright white area, im trying to make a filter for the bright white (green-blue actually) area
    but nothing seems to match the area, does anyone know how it is calculated?
    i 've tried everything, fresnel/sss/shadow/ao/cavity filters but nothing seems to be matching it correctly

  2. i get an unwanted transparency effect probably caused because of the hardness where the wax back-scattering meets the wax forward-scattering
    in other words, the back/forward scattering intersection is so hard that it reflects the silouette of the geometry behind the surface almost as if it was transparent

please, do you have any suggestions or tips?
thank you very much

Attachments

forumpost.jpg

#2

I’m guessing that you have the latest version of the software (4R7) as well as the P3 patch ?
It’s usually all about the settings. You don’t have the Material : Modifiers panel open to see, I don’t recognize it.
Is that a 'real time ’ screen grab or a rendered grab?
BPR Settings all set to your liking? Were you trying to use the BPR filters?

#3

hi, thank you for the reply
well obviously it’s all about the settings but the question is, which filter can match the wax highlights, and which setting controls the sharpness of the intersection between the back and the forward scattering areas created by the wax? settings, yes ofc, but are there settings for that?
i’ve tried all the filter techniques (either bpr filters or shading mixer) and they can’t isolate the wax highlights area
im open to suggestions

no im not on the latest version bcz i first want to backup everything just in case but i haven’t done this yet so i haven’t updated
i took a look at the 4r7 features though and im not sure about whether there should be any changes affecting this in any way

also, it’s a bpr render but various things have been disabled in order to highlight the problematic areas, and there is also a bpr filter used for highlighting the wax as well

#4

You should have a look at this Tutorial, a little reading but great results.

http://www.zbrushcentral.com/showthread.php?178047-Dynamesh-sketchbook/page19&p=1117365&infinite=1#post1117365

#5

hi, thank you for the reply
as far as i can see, the renders on the tutorial suffer from the same problems, i can even see it at the final renders with full texture and lights
remember there are no textures/additional lights/sss and shadows are almost disabled in my render and that i have enhanced the wax effect with photoshop to make the problem colourful and clearly visible - so the image looks like preview
but other than that, it’s the same problem and in fact if you go through the tutorial you will find it that it indirectly recognises the problem but doesn’t suggest a way around it except for lowering the wax strength which eventually adds this wooden look to the final render even though specularity is over the roof
nice tutorial in any case but it doesn’t address the wax problem