Not sure if this is an issue with Zbrush or me the user. Most likely me!
I am currently experimenting with materials but have come across an issue with reflectivity. Environment reflection slider works and renders correctly in BPR but if I use Reflectivity, no matter how much I tweak the sliders I end up with yellowing in the render it looks dreadful. I’m using monochrome colours no yellows.
As far as I can tell I’ve got the right textures in the correct boxes for reflections, which look fine until I hit bpr? I’m at a loss as to what’s going on, just wondered if anyone knew what I was doing wrong.
Any help would be appreciated.
First off, thank you for posting the screenshots with your material settings. Information is always useful.
Unfortunately, there are just a ton of variables that go into render issues, from environmental, to lighting, to material settings. For instance, you’ve got a second shader on that material. What’s going on in that one? Is there another reflective image contributing in the other shader?
However, since the issue persists into Keyshot, it seems likely that your material is the culprit. Assign another stock reflective material from Zbrush. If the issue goes away, there’s your answer. Rather than play guessing games, consider just scrapping it then rebuilding it from scratch. If the issue re-occurs, then you’ll know what you just did to make it happen.
You may not have done anything to make it happen. The program changes over time. If you downloaded that material from someplace and it was created in an earlier version of ZBrush, it might just be broken or corrupted-- especially if it’s a matcap.
One last tip about overlapping geometry--click to read
One thing to check in addition is to make sure you dont have any overlapping geometry causing an issue. I didn’t get a good look at your mesh here, but if multiple subtools are present, make sure only the active subtool is visible. Solo mode can be useful here. Also, examine your topology closely to make sure there isnt any overlapping geometry in the active subtool either–that can happen sometimes. If there are overlapping pieces of geometry present, it’s possible that they have different material settings, and can confuse the look of the mesh.
Hi
Thanks for the response, it appears if I use reflectivity with any material new or old it creates the yellow in BPR. I am really just fumbling through trying things out so there’s no complex geometry just a polysphere with some lumps and bumps, drawn using the standard brush to help see effects . I’m keeping it simple for swifter rendering whilst I explore what Zbrush can do, as I rarely use anything other than toyplastic and skinshade in my work. I’ll continue to try options and build a material from scratch to see if I can resolve the issue. Any other ideas would be welcome.
It’s impossible for me to say what kind of changes you may have made in your file between rendering and material variables, or what sort of issues there may be with your geometry, especially if you were just experimenting as part of a learning process.
Don’t attempt to render this in your existing file. Quit the program, start a new session, and attempt to render a reflective material on the polysphere tool that comes with Lightbox, not one you create yourself–there could be an issue there as well. Render at the default BPR settings.
I think your issues may be coming from the Reflectivity-associated material values you’ve assigned. They may not work the way you might think they do. Note that many of the stock reflective materials don’t use these settings or even that shader. Mimic those materials instead.
Assuming all goes well from there, now start to build your material and take note of where any issues start when you make changes, either in your material or the BPR settings.
