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Please rollback the Displacement node back to old version
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Re: Please rollback the Displacement node back to old version

Postby ChrisH » Thu Mar 28, 2019 8:16 pm

ChrisH Thu Mar 28, 2019 8:16 pm
grimm wrote:Do you have the blur filter turned on? I can see some of these artifacts when I turn it on, but looks good when turned off.


The filter is set to None in the tests, but I tried it with the radius from 0 to 15 (and all the resolutions), and these "edge artifacts" are still there.
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Re: Please rollback the Displacement node back to old version

Postby grimm » Thu Mar 28, 2019 9:39 pm

grimm Thu Mar 28, 2019 9:39 pm
Hmm, not sure then what the issue is? I have tried both tiled and non-tiled displacement maps, 8-bit and 16-bit versions, simple and view projected UV unwrapping, and still do not have those artifacts. The only time I can see some problems is when I turn on the filter. Could it be an OS issue, I'm running Linux Mint 19?

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Re: Please rollback the Displacement node back to old version

Postby grimm » Thu Mar 28, 2019 9:56 pm

grimm Thu Mar 28, 2019 9:56 pm
Just wanted to add, if anyone has a displacement map they would like me to test, I wouldn't have any problems testing it.
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Re: Please rollback the Displacement node back to old version

Postby ChrisH » Fri Mar 29, 2019 2:48 pm

ChrisH Fri Mar 29, 2019 2:48 pm
grimm wrote:Just wanted to add, if anyone has a displacement map they would like me to test, I wouldn't have any problems testing it.


You're welcome to download my test scene (above), the texture is packed into the file. :)
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Re: Please rollback the Displacement node back to old version

Postby grimm » Fri Mar 29, 2019 5:56 pm

grimm Fri Mar 29, 2019 5:56 pm
ChrisH wrote:You're welcome to download my test scene (above), the texture is packed into the file. :)


Yarrg! I didn't even notice that, downloading it and checking it out. :D I definitely see the issue now, it looks like Octane is going past the edge or wrapping the edges around? I double checked my displacement tests and can see some of the same issues, they are just harder to see. I also brought your image into Krita and took a look at it. I didn't see anything wrong with it, although Krita did load it as a 8-bit image. I converted it to 16-bit, but it didn't make any difference. Looks like a bug to me.
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Re: Please rollback the Displacement node back to old version

Postby milanm » Fri Mar 29, 2019 7:07 pm

milanm Fri Mar 29, 2019 7:07 pm
There is one more filter.

The artifacts are caused by bilinear interpolation between pixels on the opposite edges of the texture because it's being tiled. And tiling can not be disabled (currently).

Notice the gray edges:
ImageImage
Here is the 5x5 pixel map.
5x5.zip
(1011 Bytes) Downloaded 168 times

There was a big discussion about this in the C4D forum too.

I hope this makes sense.

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