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Any advice on Fibermesh rendering issue I'm having

ZBrush Usage Questions
#1

Hi out there, I’m hoping one or more of you brilliant people will know how to solve a problem I have always had with BPR rendering of Fibermesh. I’m including an image.

So whenever I render any fibermesh, I get this artifact where the edge of the fibers have a light halo wherever the fibers are in front of another subtool. I can’t get rid of it. I have tried increasing document size, changing the rays and angles of the shadows and AO, increasing the SPix to 7, converting the fibermesh into Geometry, changing the material and polypaint, rendering without any grooming of the fibers, but nothing that I’ve tried seems to do anything. I can’t tell if it is some problem with anti-aliasing, an artifact in the rendering, or what, but it makes it impossible for me to use BPR whenever I have fibermesh on a model.

Any advice to solve this would be very appreciated. Thank you for reading this.

Fibermesh BPR
Fibermesh BPR1771×1252 655 KB

#2

For anyone here who has this issue, I got an email from Pixologic with a workaround for this issue. Here is the text from the email:

  • Apparently, this is a known issue still under investigation. It’s related to the BPR SPix anti-aliasing, and it happens where the fibermesh overlaps rendered shadows. The issue will go away if you turn the BPR SPix to zero, however this will result in a coarser image.

    1. Set SPix to zero. Set the document resolution to double the intended output size, then in the Document palette, press the “AA Half” button. This is the legacy AA effect in ZBrush. Images rendered at half size will recieve an in built anti-aliasing effect, albeit with less control than BPR would normally give you. Now perform your BPR renders. If working with render passes, they must all be performed at this size.
    1. If working with render passes, perform your shadow pass with SPix set to zero, and all other passes as normal. This may result in coarser detail in some of the shadows, but may not be noticeable with skillful compositing.