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Vertical lines appear in image while using a vector displacement map

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Message 1 of 7
theo
451 Views, 6 Replies

Vertical lines appear in image while using a vector displacement map

994-arnold-properties-modifier01.jpg

Hi, I am getting vertical lines appearing in my reflections while using a vector displacement map on the water plane - I was guided by the Arnold tutorial. The water has an Arnold Properties Modifier with a vector displacement map. I have gone through and adjusted each setting but can not get rid of the vertical lines. My iterations are set to 8 but higher or lower values makes no difference. If I use another hdr image I get the same result - mainly in the bright areas. Please advise, thank you.

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6 REPLIES 6
Message 2 of 7
lee_griggs
in reply to: theo

There is now a scene file attached to the ocean tutorial. There is also a workflow example at the bottom of the page. If that doesn't help, can you post your scene?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 7
theo
in reply to: theo

Yes, I have analyzed the scene in the tutorial - but this problem doesn't seem to show up, possibly because it is a close-up view of choppy sea waves and this is a more distant shot. I like how it does the horizontal lines, just need to get rid of the vertical ones. It is late here now so I will post a scene in the morning. Thanks.

Message 4 of 7
michiel.van.gasse
in reply to: theo

Probably a to low resolution hdri, or wrong mapping of it.

Make it environment mapping and use a higher resolution hdri.

You could set the resolution higher if using the skydome.

Message 5 of 7
theo
in reply to: theo

I added a large hdri 15000 x 7500 and still no improvement. Not sure how to use the skydome - there is no place to add the hdri image. When adding an hdri to the environment slot it is supposed to add a skydome automatically - but not sure how to adjust it. I have added my scene file.city-arnold02a.zip

998-arnold-properties-modifier02.jpg

Message 6 of 7
michiel.van.gasse
in reply to: theo

Here are the setting if you want to use the environment slot.

1003-2.jpg

Set custom resolution to the resolution of your Hdri or a decent value to speed it up.

Also a Camera (aa) of 10 is to high, unless using dof or volumetrics.

Usually 3 - 6 would be good.

Message 7 of 7
theo
in reply to: theo

Thank you! That worked well.

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