Single lines in a refractic/reflectiv material

[benjaminshpigler]

Hi folks, my first post to this forum .... yeahh..

I have a problem with a refractiv material. I got single lines in my render, so the image flicker on the videomonitor. when the camera rotes its very hard to ignore ... How can I avoid such flickering.

other refractiv settings or anti aliasing? I have to keep in mind that I have to render thousends of images.. rendertimes matters.

anti aliasing settings are adaptiv subdivision, min 0 max 3, treshold 0.1, multipass rand, material refract/reflection white, other settings are default values, HDRI as evironment, 1.09.03g

thank you for any comment

benjamin

[RErender]

Maybe a smoothing problem or double faces?

[benjaminshpigler]

thank you for your hint.

no double faces.

I checked smoothing, I found some and removed the smoothing.
Then I removed my "loved" little bevels. And the "noise" was gone. That is not the expected "help-button", but I can render without flickering.

Especially the strange lines came from the "field"-rendering, sorry I forgot to mention.

I can live without the bevels and I hope my customer too.

Just to finish the discussion. What should I do if I really need the bevels ? Am I lost in this case?

thank you very much for your push in the right direction.

benjamin

[RErender]

I don't really know why having the bevels would cause the problem, although for some details AA needs to be a little higher. Bump maps work very well with a direct light. Maybe just try modeling it again in a different fashion, if it is from Archicad or Autocad or ? they can create some weird edges.

[benjaminshpigler]

I removed "RAND", because of the small pixel at the edge.
I used AA with max Value 4, but the noise still there.
Rendertimes goes up. hmmmm.

I didnt import it. Its a rotated spline. No Bump.

I think its the same with reflection and a Reflection Map that is too detailed.
And the refraction part double the error, because it can be seen at multiple places in the object.

No Bevel or big Bevel. Small bevels create problems.
In Still Picture it can be ignored, but in the animation and made for video it can't be ignored.

cu benjamin

[GoncaloP]

Do you have lights with "smoth surfcaces" option applied, if so uncheck it, it usualy doesnt work with detailed geometry.

Gonçalo

[benjaminshpigler]

Sorry I cant find that option.
I use standard spots...Did I missed someting ?

cu benjamin

[GoncaloP]

Can you post a image with your aa settings?

Did you already try to uncheck the randomize? it doesnt seems to be a good good option for animations...

Anyway the standart light have Vray options too, and also have that option.

[losbellos]

Goncalo Master saying about your light's shadows settings. See if it is vray shadow then uncheck the "smooth surface shadows" option in it. (dafult is off)
That was he trying to tell.

[benjaminshpigler]

ah, ok. no problem.

I dont use vray shadows..

euphoric waving ...

benjamin

[GoncaloP]

You dont use Vrayshadows???????? what did you use then?

Thats the problem thought...

Gonçalo

[benjaminshpigler]

I use standard lights...

But that is not the problem. Its the reflection.

Simple test. ChamferCylinder.
Shellac Material
First: Vray-material
High reflection, High refraction.
Second: Standard
10 Percent Reflection with a HDRI-Map
200 as Mixture.

Camera looks trough the Cylinder to the other side. Standard lights.
You got small dots at the bottom Edge of the Cylinder.

cu benjamin

[benjaminshpigler]

Can you post a image with your aa settings?

Did you already try to uncheck the randomize? it doesnt seems to be a good good option for animations...

Anyway the standart light have Vray options too, and also have that option.

You are right the randomize enforce the "flickering", I switched it off.
AA Settings are Adaptive subdivision default settings, except maximum value is 3.

Even with high settings the problem doesnt disappear.

cu benjamin

P.S. I use Shadow Map... flickering appear in my image as small thin lines or spots, not that kind of diffuse brightness flickering that appear with shadows, as far as I know.

[GoncaloP]

If you try to change the shadow to Vrayshadow in your lights is the problem still there?

Gonçalo