stripe pattern in displacement reflection

[zomtech]

Hello,


can anyone explain why this stripe pattern appears in my displacementmap? I have this from time to time and it's not linked to the maps I use and appears randomly, often with small lights than aren't facing the camera completly.
I'd like to get rid of it. Any ideas?

[aoktar]

Hard to be sure with your very small information. Please always post more details from your setup or post a scene.

But i bet for Ray epsilon. Also try your objects or materials on a isolated scene when you have issues.

[zomtech]

It's a 8k displacementmap in 32bit open exr with no negative values, flat mapped onto a plane.
There's also bump but it seems not to influence the result since the "error" appears also with bump turned off.

I played a bit with ray epsilon, but it seems to have no effect.
Would it be possible to PN you the scene?

[aoktar]

It's a 8k displacementmap in 32bit open exr with no negative values, flat mapped onto a plane.
There's also bump but it seems not to influence the result since the "error" appears also with bump turned off.

I played a bit with ray epsilon, but it seems to have no effect.
Would it be possible to PN you the scene?

Yes sure.

[GIOLETS]

Any news about?
Here I have the same problem

using a 4096 tif 32bit UV map

[bepeg4d]

Hi, could you share a simple scene with texture?
ciao beppe

[GIOLETS]

Sure, thanks.

test_displ.rar

(773.13 KiB) Downloaded 168 times

[aoktar]

Sure, thanks.

test_displ.rar

It's not same problem. Your texture is 8bit. It can't give high precision for heights. Try to use 16/32, especially 32bit images.

[GIOLETS]

Ok Ithink to have resolved (thanks to Ahmet and Bepeg4d):

- I have to use 32 bit map,
- gray levels,
- blurred a bit