Opacity Map Rendering Problem

V-Ray V-Ray for 3ds Max Issues
1

Hi there,
I have this fur mesh(as planes opacity mapped). As you can see, opacity map rendering with problems: the light colored areas are rendering wrong. FurBase is a dark grey color (rgb 32).
I made a search and notice that this has been a known bug.
The problem is present both in progressive or bucket mode. I tried stochastic and clip mode as well and unfortunately there is still the problem.
I use 3dsmax 2016 and Vray 3.60.04 and sending my material setup. (very basic mapped diffuse channel and opacity)

Is there any solution for this so far?
​​​​​​​So please help. How can I proceed?

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2

Have you tried setting blur of the diffuse to 1.0, and working with a VrayHDRI map instead of a regular bitmap, with elliptical filtering?

3

Thanks for the reply!
Sorry for forgetting to mention that.
Rendered with a rayHDRI map instead of a regular bitmap, with elliptical filtering (blur=1) and render was still with the same problem unfortunately.

4

Hmmm how about raising the maximum transparency levels in the settings. I don’t know how your geometry looks just a quick guess.

5

Also, the lighter spots, is that visible in the diffuse or in another render element?

6

Yes. But seeing as the spots appear more on the surface rather than inside I don’t think it will change anything, although trying doesn’t hurt.

All things aside, your fur looks quite amazing. I’ve tried messing with Fur and Hair modifier for a day and couldn’t get a result that looked that natural. Care to share a bit of your workflow?

7

No it doesnt.
The spots are not present on DirectLighting pass and LightingPass. Only on GI pass.
Played with LC settings but not solution.
Made a test with BF+BF and the spots are still on GI pass.

8

Thank you very much.
Happy to hear this because tried different methods as well. Finally I modeled the planes in zbrush and mapped as plane so that I can put a opacity map and created the opcaity map in Photoshop.

9

As @Vizioen adviced, I would also suggest raising the Max transparency levels. Did you try it and did it help?

10

I tried and it didn?t help. So the transparency levels setting is not only for are refraction but for opacity as well?

11

To be honest you already tested everything I could think of, but as a last try uncheck GI caustics and see what will happen ..sometimes I get white spots and that remove them .

12

Try change adaptive light to full

13

@pixela Since nothing we suggested helped, could you send us the scene to suppport@chaosgroup.com so we can take a look at it?

14

I just stumbled across this thread here, but maybe my issue is related?: